0001136352-21-000003 | 10-K | XBRL Viewer | Crestwood Equity Partners LP

Crestwood Midstream Partners LP, as a wholly-owned subsidiary of a reporting company, meets the conditions set forth in General Instruction (I)(1)(a) and (b) of Form 10-K and is therefore filing this report with the reduced disclosure format as permitted by such instruction.

ICFR Auditor Attestation Flag

true

Document Period End Date

Dec. 31, 2020

Current Fiscal Year End Date

--12-31

Document Type

10-K

CMLP

Entity Information [Line Items]

Entity Registrant Name

Crestwood Midstream Partners LP

Entity File Number

001-35377

Entity Incorporation, State or Country Code

Entity Tax Identification Number

20-1647837

Entity Well-known Seasoned Issuer

Entity Voluntary Filers

Entity Current Reporting Status

Yes

Entity Interactive Data Current

Yes

Entity Filer Category

Non-accelerated Filer

Entity Small Business

false

Entity Emerging Growth Company

false

Entity Shell Company

false

Entity Public Float

$ 0

Entity Common Stock, Shares Outstanding

Entity Central Index Key

0001304464

Document Fiscal Year Focus

2020

Document Fiscal Period Focus

Amendment Flag

false

ICFR Auditor Attestation Flag

false

Document Period End Date

Dec. 31, 2020

Document Type

10-K

Common units

Entity Information [Line Items]

Title of 12(b) Security

Common Units representing limited partnership interests

Trading Symbol

CEQP

Security Exchange Name

NYSE

Preferred Units

Entity Information [Line Items]

Title of 12(b) Security

Preferred Units representing limited partner interests

Trading Symbol

CEQP-P

Security Exchange Name

NYSE

Consolidated Balance Sheets - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Assets
Cash	$ 14,000,000.0	$ 25,700,000
Accounts receivable, less allowance for doubtful accounts	262,200,000	242,200,000
Inventory	89,100,000	53,700,000
Assets from price risk management activities	27,200,000	43,200,000
Prepaid expenses and other current assets	13,400,000	11,600,000
Total current assets	405,900,000	376,400,000
Property, plant and equipment	3,759,600,000	3,612,500,000
Less: accumulated depreciation	842,500,000	703,400,000
Property, plant and equipment, net	2,917,100,000	2,909,100,000
Intangible assets	1,126,100,000	1,076,300,000
Less: accumulated amortization	331,800,000	271,100,000
Intangible assets, net	794,300,000	805,200,000
Goodwill	138,600,000	218,900,000
Operating lease right-of-use assets, net	36,800,000	53,800,000
Investments in unconsolidated affiliates	943,700,000	980,400,000
Other non-current assets	7,300,000	5,500,000
Total assets	5,243,700,000	5,349,300,000
Current liabilities:
Accounts payable	160,300,000	189,200,000
Accrued expenses and other liabilities	122,000,000.0	161,700,000
Liabilities from price risk management activities	76,300,000	6,700,000
Contingent consideration - current	19,000,000.0	0
Current portion of long-term debt	200,000	200,000
Total current liabilities	377,800,000	357,800,000
Long-term debt, less current portion	2,483,800,000	2,328,300,000
Contingent consideration	38,000,000.0	57,000,000.0
Other long-term liabilities	253,300,000	244,600,000
Deferred income taxes	2,700,000	2,600,000
Liabilities	3,155,600,000	2,990,300,000
Commitments and contingencies (Note 10)
Interest of non-controlling partner in subsidiary (Note 12)	432,700,000	426,200,000
Interest of non-controlling partner in subsidiary (Note 12)
Partners' capital	1,043,400,000	1,320,800,000
Preferred units	612,000,000.0	612,000,000.0
Total partners’ capital	1,655,400,000	1,932,800,000
Total liabilities and capital	5,243,700,000	5,349,300,000
CMLP
Assets
Cash	13,700,000	25,400,000
Accounts receivable, less allowance for doubtful accounts	262,200,000	241,900,000
Inventory	89,100,000	53,700,000
Assets from price risk management activities	27,200,000	43,200,000
Prepaid expenses and other current assets	13,400,000	11,600,000
Total current assets	405,600,000	375,800,000
Property, plant and equipment	4,089,600,000	3,942,600,000
Less: accumulated depreciation	1,028,300,000	875,100,000
Property, plant and equipment, net	3,061,300,000	3,067,500,000
Intangible assets	1,126,100,000	1,076,300,000
Less: accumulated amortization	331,800,000	271,100,000
Intangible assets, net	794,300,000	805,200,000
Goodwill	138,600,000	218,900,000
Operating lease right-of-use assets, net	36,800,000	53,800,000
Investments in unconsolidated affiliates	943,700,000	980,400,000
Other non-current assets	5,200,000	2,400,000
Total assets	5,385,500,000	5,504,000,000.0
Current liabilities:
Accounts payable	157,800,000	186,600,000
Accrued expenses and other liabilities	120,100,000	160,400,000
Liabilities from price risk management activities	76,300,000	6,700,000
Contingent consideration - current	19,000,000.0	0
Current portion of long-term debt	200,000	200,000
Total current liabilities	373,400,000	353,900,000
Long-term debt, less current portion	2,483,800,000	2,328,300,000
Contingent consideration	38,000,000.0	57,000,000.0
Other long-term liabilities	251,800,000	238,600,000
Deferred income taxes	700,000	700,000
Liabilities	3,147,700,000	2,978,500,000
Interest of non-controlling partner in subsidiary (Note 12)	432,700,000	426,200,000
Interest of non-controlling partner in subsidiary (Note 12)
Total CEQP/CMLP partners’ capital	1,805,100,000	2,099,300,000
Total liabilities and capital	$ 5,385,500,000	$ 5,504,000,000.0

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Allowance for doubtful accounts	$ 0.9	$ 0.3
Limited partners' units, issued	73,970,208	72,282,942
Limited partners' units, outstanding	73,970,208	72,282,942
Preferred units, outstanding (in units)	71,257,445	71,257,445
Preferred units, issued	71,257,445	71,257,445
CMLP
Allowance for doubtful accounts	$ 0.9	$ 0.3

Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues:
Revenues	$ 2,254.3	$ 3,181.9	$ 3,654.1
Costs of product/services sold (exclusive of items shown separately below):
Product costs - related party (Note 19)	21.0	45.4	134.7
Total costs of products/services sold	1,600.5	2,544.9	3,129.4
Operating expenses and other:
Operations and maintenance	131.8	138.8	125.8
General and administrative	91.5	103.4	88.1
Depreciation, amortization and accretion	237.4	195.8	168.7
Loss on long-lived assets, net	26.0	6.2	28.6
Goodwill impairment	0.0	(209.4)	0.0
Goodwill impairment	80.3	0.0	0.0
Total expenses	567.0	234.8	411.2
Operating income	86.8	402.2	113.5
Earnings from unconsolidated affiliates, net	32.5	32.8	53.3
Interest and debt expense, net	(133.6)	(115.4)	(99.2)
Gain (loss) on modification/extinguishment of debt	0.1	0.0	(0.9)
Other income (expense), net	(0.7)	0.6	0.4
Income (loss) before income taxes	(14.9)	320.2	67.1
Provision for income taxes	(0.4)	(0.3)	(0.1)
Net income (loss)	(15.3)	319.9	67.0
Net income attributable to non-controlling partner	40.8	34.8	16.2
Net income (loss) attributable to parent	(56.1)	285.1	50.8
Net income attributable to preferred units	60.1	60.1	60.1
Net income (loss) attributable to partners	(116.2)	225.0	(9.3)
Subordinated unitholders’ interest in net income	0.0	1.4	0.0
Common unitholders’ interest in net income (loss)	$ (116.2)	$ 223.6	$ (9.3)
Net income (loss) per limited partner unit: (Note 14)
Basic (dollars per unit)	$ (1.59)	$ 3.11	$ (0.13)
Diluted (dollars per unit)	$ (1.59)	$ 2.93	$ (0.13)
Weighted-average limited partners’ units outstanding:
Basic (units)	73.2	71.8	71.2
Dilutive units (units)	0.0	5.1	0.0
Diluted (units)	73.2	76.9	71.2
CMLP
Revenues:
Revenues	$ 2,254.3	$ 3,181.9	$ 3,654.1
Costs of product/services sold (exclusive of items shown separately below):
Product costs - related party (Note 19)	21.0	45.4	134.7
Total costs of products/services sold	1,600.5	2,544.9	3,129.4
Operating expenses and other:
Operations and maintenance	131.8	138.8	125.8
General and administrative	86.7	98.2	83.5
Depreciation, amortization and accretion	251.5	209.9	181.4
Loss on long-lived assets, net	26.0	6.2	28.6
Goodwill impairment	0.0	(209.4)	0.0
Goodwill impairment	80.3	0.0	0.0
Total expenses	576.3	243.7	419.3
Operating income	77.5	393.3	105.4
Earnings from unconsolidated affiliates, net	32.5	32.8	53.3
Interest and debt expense, net	(133.6)	(115.4)	(99.2)
Gain (loss) on modification/extinguishment of debt	0.1	0.0	(0.9)
Other income (expense), net	0.0	0.2	0.0
Income (loss) before income taxes	(23.5)	310.9	58.6
Provision for income taxes	0.1	(0.3)	0.0
Net income (loss)	(23.4)	310.6	58.6
Net income attributable to non-controlling partner	40.8	34.8	16.2
Net income (loss) attributable to parent	(64.2)	275.8	42.4
Service
Revenues:
Revenues	434.0	426.6	344.4
Related party (Note 19)	0.5	0.0	1.0
Costs of product/services sold (exclusive of items shown separately below):
Product and service costs	20.7	29.8	44.2
Service \| CMLP
Revenues:
Revenues	434.0	426.6	344.4
Related party (Note 19)	0.5	0.0	1.0
Costs of product/services sold (exclusive of items shown separately below):
Product and service costs	20.7	29.8	44.2
Product
Revenues:
Revenues	1,820.3	2,755.3	3,309.7
Related party (Note 19)	27.3	2.9	0.0
Costs of product/services sold (exclusive of items shown separately below):
Product and service costs	1,558.8	2,469.7	2,950.5
Product \| CMLP
Revenues:
Revenues	1,820.3	2,755.3	3,309.7
Related party (Note 19)	27.3	2.9	0.0
Costs of product/services sold (exclusive of items shown separately below):
Product and service costs	1,558.8	2,469.7	2,950.5
Gathering and Processing Segment \| Service
Revenues:
Revenues	391.2	380.0	276.1
Gathering and Processing Segment \| Service \| CMLP
Revenues:
Revenues	391.2	380.0	276.1
Gathering and Processing Segment \| Product
Revenues:
Revenues	240.2	455.8	670.5
Gathering and Processing Segment \| Product \| CMLP
Revenues:
Revenues	240.2	455.8	670.5
Marketing Supply and Logistics
Revenues:
Revenues			2,690.3
Marketing Supply and Logistics \| Service
Revenues:
Revenues	28.5	26.2	50.2
Marketing Supply and Logistics \| Service \| CMLP
Revenues:
Revenues	28.5	26.2	50.2
Marketing Supply and Logistics \| Product
Revenues:
Revenues	1,552.8	2,296.6	2,639.2
Marketing Supply and Logistics \| Product \| CMLP
Revenues:
Revenues	1,552.8	2,296.6	2,639.2
Storage and Transportation \| Service
Revenues:
Revenues	13.8	20.4	17.1
Storage and Transportation \| Service \| CMLP
Revenues:
Revenues	$ 13.8	$ 20.4	$ 17.1

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (15.3)	$ 319.9	$ 67.0
Change in fair value of Suburban Propane Partners, L.P. units	0.0	0.3	(0.7)
Comprehensive income (loss)	(15.3)	320.2	66.3
Comprehensive income (loss) attributable to non-controlling partners	40.8	34.8	16.2
Comprehensive income (loss) attributable to Crestwood Equity Partners LP	$ (56.1)	$ 285.4	$ 50.1

- Definition

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income (loss) and other comprehensive income (loss), attributable to noncontrolling interests. Excludes changes in equity resulting from investments by owners and distributions to owners.

+ References + Details

- Definition

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners.

+ References + Details

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

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+ Details

Consolidated Statement of Partners' Capital - USD ($)	Total	CMLP	Preferred Units	Common Unit Capital	Common Unit Capital Cumulative Effect, Period of Adoption, Adjustment	Common Unit Capital CMLP	Common Unit Capital CMLP Cumulative Effect, Period of Adoption, Adjustment	Limited Partners	Limited Partners CMLP	Non-Controlling Partner	Non-Controlling Partner CMLP	Total Partners’ Capital	Total Partners’ Capital Cumulative Effect, Period of Adoption, Adjustment	Total Partners’ Capital CMLP	Total Partners’ Capital CMLP Cumulative Effect, Period of Adoption, Adjustment	Subordinated units	Common units	Preferred Units
Balance at the beginning of the period at Dec. 31, 2017			$ 612,000,000.0					$ 1,393,500,000	$ 2,195,400,000	$ 175,000,000.0	$ 175,000,000.0	$ 2,180,500,000		$ 2,370,400,000
Balance at the beginning of the period (in units) at Dec. 31, 2017																400,000	70,300,000
Preferred units balance at the beginning of the period (in units) at Dec. 31, 2017																		71,300,000
Increase (Decrease) in Partners' Capital [Roll Forward]
Unit-based compensation charges								28,500,000	28,500,000			28,500,000		28,500,000
Unit-based compensation charges (in units)																	1,100,000
Taxes paid for unit-based compensation vesting								(7,400,000)	(7,400,000)			(7,400,000)		(7,400,000)
Taxes paid for unit-based compensation vesting (in units)																	(200,000)
Distributions to partners			(60,100,000)					(170,800,000)	(238,400,000)	(9,900,000)	(9,900,000)	(240,800,000)		(248,300,000)
Change in fair value of Suburban Propane Partners, L.P. units								(700,000)				(700,000)
Other				$ (800,000)		$ 200,000						(800,000)		200,000
Net income (loss)	$ 67,000,000.0	$ 58,600,000	60,100,000					(9,300,000)	42,400,000	16,200,000	16,200,000	67,000,000.0		58,600,000
Balance at the beginning of the period (in units) at Dec. 31, 2018																400,000	71,200,000
Preferred units balance at the end of the period (in units) at Dec. 31, 2018																		71,300,000
Balance at the end of the period at Dec. 31, 2018			612,000,000.0					1,240,500,000	2,028,200,000	181,300,000	181,300,000	2,033,800,000		2,209,500,000
Increase (Decrease) in Partners' Capital [Roll Forward]
Total partners’ capital					$ 7,500,000		$ 7,500,000						$ 7,500,000		$ 7,500,000
Unit-based compensation charges								42,400,000	42,400,000			42,400,000		42,400,000
Unit-based compensation charges (in units)																	1,000,000.0
Taxes paid for unit-based compensation vesting								(11,000,000.0)	(11,000,000.0)			(11,000,000.0)		(11,000,000.0)
Taxes paid for unit-based compensation vesting (in units)																	(300,000)
Distributions to partners			(60,100,000)					(172,400,000)	(235,800,000)	(6,600,000)	(6,600,000)	(239,100,000)		(242,400,000)
Change in fair value of Suburban Propane Partners, L.P. units								300,000				300,000
Non-controlling interest reclassification (Note 12)	178,800,000									(178,800,000)	(178,800,000)	(178,800,000)		(178,800,000)
Other				(4,000,000.0)		(300,000)				100,000	100,000	(3,900,000)		(200,000)
Net income (loss)	$ 319,900,000	310,600,000	60,100,000					225,000,000.0	275,800,000	4,000,000.0	4,000,000.0	289,100,000		279,800,000
Balance at the beginning of the period (in units) at Dec. 31, 2019																400,000	71,900,000
Preferred units balance at the end of the period (in units) at Dec. 31, 2019	71,257,445																	71,300,000
Balance at the end of the period at Dec. 31, 2019		2,099,300,000	612,000,000.0					1,320,800,000	2,099,300,000	$ 0	0	1,932,800,000		2,099,300,000
Increase (Decrease) in Partners' Capital [Roll Forward]
Total partners’ capital	$ 1,932,800,000
Contingent consideration - current	0	0
Unit-based compensation charges								34,000,000.0	29,300,000			34,000,000.0		29,300,000
Unit-based compensation charges (in units)																	2,100,000
Taxes paid for unit-based compensation vesting								(15,600,000)	(15,600,000)			(15,600,000)		(15,600,000)
Taxes paid for unit-based compensation vesting (in units)																	(600,000)
Stockholders' Equity, Other Shares																	200,000
Distributions to partners			(60,100,000)					(182,700,000)	(242,600,000)			(242,800,000)		(242,600,000)
Other				$ 3,100,000		$ (1,100,000)						3,100,000		(1,100,000)
Net income (loss)	$ (15,300,000)	(23,400,000)	60,100,000					(116,200,000)	(64,200,000)			(56,100,000)		(64,200,000)
Balance at the beginning of the period (in units) at Dec. 31, 2020																400,000	73,600,000
Preferred units balance at the end of the period (in units) at Dec. 31, 2020	71,257,445																	71,300,000
Balance at the end of the period at Dec. 31, 2020		1,805,100,000	$ 612,000,000.0					$ 1,043,400,000	$ 1,805,100,000		$ 0	$ 1,655,400,000		$ 1,805,100,000
Increase (Decrease) in Partners' Capital [Roll Forward]
Total partners’ capital	$ 1,655,400,000
Contingent consideration - current	$ 19,000,000.0	$ 19,000,000.0

Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating activities
Net income (loss)	$ (15.3)	$ 319.9	$ 67.0
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, amortization and accretion	237.4	195.8	168.7
Amortization of debt-related deferred costs	6.5	6.2	6.8
Unit-based compensation charges	30.7	47.0	28.5
Loss on long-lived assets, net	26.0	6.2	28.6
Goodwill impairment	0.0	(209.4)	0.0
Goodwill impairment	80.3	0.0	0.0
(Gain) loss on modification/extinguishment of debt	(0.1)	0.0	0.9
Earnings from unconsolidated affiliates, net, adjusted for cash distributions received	6.5	6.9	0.5
Deferred income taxes	0.1	0.0	(0.7)
Other	(0.1)	0.0	0.2
Changes in operating assets and liabilities:
Accounts receivable	(27.5)	42.9	167.8
Inventory	(33.7)	10.9	(24.1)
Prepaid expenses and other current assets	(3.7)	0.1	(3.1)
Accounts payable, accrued expenses and other liabilities	(1.2)	(23.3)	(138.6)
Reimbursements of property, plant and equipment	15.7	24.8	21.7
Increase (Decrease) in Derivative Assets and Liabilities	86.5	(7.6)	(70.6)
Net cash provided by operating activities	408.1	420.4	253.6
Investing activities
Acquisitions, net of cash acquired (Note 3)	(162.3)	(462.1)	0.0
Purchases of property, plant and equipment	(168.3)	(455.5)	(305.5)
Investments in unconsolidated affiliates	(9.4)	(61.3)	(64.4)
Capital distributions from unconsolidated affiliates	39.4	35.5	49.2
Net proceeds from sale of assets	27.3	0.8	79.5
Other	0.0	(1.1)	0.0
Net cash used in investing activities	(273.3)	(943.7)	(241.2)
Financing activities
Proceeds from the issuance of long-term debt	1,125.1	2,307.3	2,274.8
Payments on long-term debt	(975.8)	(1,729.5)	(2,015.7)
Payments on finance leases	3.1	3.5
Payments on capital leases			(1.6)
Payments for deferred financing costs	0.0	(9.0)	(5.7)
Net proceeds from issuance of non-controlling interest	2.8	235.0	0.0
Distributions to partners	(182.7)	(172.4)	(170.8)
Distributions to non-controlling partner	(37.1)	(25.0)	(9.9)
Distributions to preferred unitholders	(60.1)	(60.1)	(60.1)
Taxes paid for unit-based compensation vesting	(15.6)	(11.0)	(7.4)
Other	0.0	0.0	(0.1)
Net cash provided by (used in) financing activities	(146.5)	531.8	3.5
Net change in cash and restricted cash	(11.7)	8.5	15.9
Cash and restricted cash at beginning of period	25.7	17.2	1.3
Cash and restricted cash at end of period	14.0	25.7	17.2
Supplemental disclosure of cash flow information
Cash paid for interest	129.8	123.7	97.4
Cash paid for income taxes	0.6	0.6	3.1
Supplemental schedule of noncash investing activities
Net change to property, plant and equipment through accounts payable and accrued expenses	40.0	(27.7)	0.3
CMLP
Operating activities
Net income (loss)	(23.4)	310.6	58.6
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, amortization and accretion	251.5	209.9	181.4
Amortization of debt-related deferred costs	6.5	6.2	6.8
Unit-based compensation charges	30.7	47.0	28.5
Loss on long-lived assets, net	26.0	6.2	28.6
Goodwill impairment	0.0	(209.4)	0.0
Goodwill impairment	80.3	0.0	0.0
(Gain) loss on modification/extinguishment of debt	(0.1)	0.0	0.9
Earnings from unconsolidated affiliates, net, adjusted for cash distributions received	6.5	6.9	0.5
Deferred income taxes	0.0	0.2	(0.1)
Other	(0.1)	0.0	0.2
Changes in operating assets and liabilities:
Accounts receivable	(27.8)	41.6	169.3
Inventory	(33.7)	10.9	(24.1)
Prepaid expenses and other current assets	(4.6)	0.1	(3.1)
Accounts payable, accrued expenses and other liabilities	(6.1)	(23.3)	(138.1)
Reimbursements of property, plant and equipment	15.7	24.8	21.7
Increase (Decrease) in Derivative Assets and Liabilities	86.5	(7.6)	(70.6)
Net cash provided by operating activities	407.9	424.1	260.5
Investing activities
Acquisitions, net of cash acquired (Note 3)	(162.3)	(462.1)	0.0
Purchases of property, plant and equipment	(168.3)	(455.5)	(305.5)
Investments in unconsolidated affiliates	(9.4)	(61.3)	(64.4)
Capital distributions from unconsolidated affiliates	39.4	35.5	49.2
Net proceeds from sale of assets	27.3	0.8	79.5
Other	0.0	(1.1)	0.0
Net cash used in investing activities	(273.3)	(943.7)	(241.2)
Financing activities
Proceeds from the issuance of long-term debt	1,125.1	2,307.3	2,274.8
Payments on long-term debt	(975.8)	(1,729.5)	(2,015.7)
Payments on finance leases	3.1	3.5
Payments on capital leases			(1.6)
Payments for deferred financing costs	0.0	(9.0)	(5.7)
Net proceeds from issuance of non-controlling interest	2.8	235.0	0.0
Distributions to partners	(242.6)	(235.8)	(238.4)
Distributions to non-controlling partner	(37.1)	(25.0)	(9.9)
Taxes paid for unit-based compensation vesting	(15.6)	(11.0)	(7.4)
Other	0.0	0.0	0.1
Net cash provided by (used in) financing activities	(146.3)	528.5	(3.8)
Net change in cash and restricted cash	(11.7)	8.9	15.5
Cash and restricted cash at beginning of period	25.4	16.5	1.0
Cash and restricted cash at end of period	13.7	25.4	16.5
Supplemental disclosure of cash flow information
Cash paid for interest	129.8	123.7	97.4
Cash paid for income taxes	0.5	0.6	0.6
Supplemental schedule of noncash investing activities
Net change to property, plant and equipment through accounts payable and accrued expenses	$ 40.0	$ (27.7)	$ 0.3

Organization and Description of Business	12 Months Ended
Organization and Description of Business	Dec. 31, 2020
Disclosure Partnership Organization And Basis Of Presentation Narrative [Abstract]
Organization and Description of Business	Organization and Description of Business The accompanying notes to the consolidated financial statements apply to Crestwood Equity Partners LP (the Company, Crestwood Equity or CEQP) and Crestwood Midstream Partners LP (Crestwood Midstream or CMLP) unless otherwise indicated. Organization Crestwood Equity Partners LP. CEQP is a publicly-traded (NYSE: CEQP) Delaware limited partnership formed in March 2001. Crestwood Equity GP LLC, which is indirectly owned by Crestwood Holdings LLC (Crestwood Holdings), owns our non-economic general partnership interest. Crestwood Holdings, which is substantially owned and controlled by First Reserve Management, L.P. (First Reserve), also owns approximately 24% of Crestwood Equity’s common units and all of its subordinated units. Crestwood Midstream Partners LP. Crestwood Equity owns a 99.9% limited partnership interest in Crestwood Midstream and Crestwood Gas Services GP LLC (CGS GP), a wholly-owned subsidiary of Crestwood Equity, owns a 0.1% limited partnership interest in Crestwood Midstream. Crestwood Midstream GP LLC, a wholly-owned subsidiary of Crestwood Equity, owns the non-economic general partnership interest of Crestwood Midstream. Unless otherwise indicated, references in this report to “we,” “us,” “our,” “ours,” “our company,” the “partnership,” the “Company,” “Crestwood Equity,” “CEQP,” and similar terms refer to either Crestwood Equity Partners LP itself or Crestwood Equity Partners LP and its consolidated subsidiaries, as the context requires. Unless otherwise indicated, references to “Crestwood Midstream” and “CMLP” refer to Crestwood Midstream Partners LP and its consolidated subsidiaries. Description of Business Crestwood Equity develops, acquires, owns or controls, and operates primarily fee-based assets and operations within the energy midstream sector. We provide broad-ranging infrastructure solutions across the value chain to service premier liquids-rich natural gas and crude oil shale plays across the United States. We own and operate a diversified portfolio of NGL, crude oil, natural gas and produced water gathering, processing, storage, disposal and transportation assets that connect fundamental energy supply with energy demand across the United States. Crestwood Equity is a holding company and all of its consolidated operating assets are owned by or through its wholly-owned subsidiary, Crestwood Midstream. Our financial statements reflect three operating and reporting segments described below. •Gathering and Processing. Our gathering and processing (G&P) operations provide natural gas, crude oil and produced water gathering, compression, treating, processing and disposal services to producers in multiple unconventional resource plays in some of the largest shale plays in the United States in which we have established footprints in the “core of the core” areas. •Storage and Transportation. Our storage and transportation (S&T) operations provide crude oil and natural gas storage and transportation services to producers, utilities and other customers. •Marketing, Supply and Logistics. Our marketing, supply and logistics (MS&L) operations provide NGL, crude oil and natural gas marketing, storage, terminal and transportation services to producers, refiners, marketers and other customers.

Basis of Presentation and Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2020

Accounting Policies [Abstract]

Basis of Presentation and Summary of Significant Accounting Policies

Basis of Presentation

Our consolidated financial statements are prepared in accordance with GAAP and include the accounts of all consolidated subsidiaries after the elimination of all intercompany accounts and transactions. Certain amounts in prior periods have been

reclassified to conform to the current year presentation, none of which impacted our previously reported net income, earnings per unit or partners’ capital. In management’s opinion, all necessary adjustments to fairly present our results of operations, financial position and cash flows for the periods presented have been made and all such adjustments are of a normal and recurring nature.

Significant Accounting Policies

Principles of Consolidation

We consolidate entities when we have the ability to control or direct the operating and financial decisions of the entity or when we have a significant interest in the entity that gives us the ability to direct the activities that are significant to that entity. The determination to consolidate or apply the equity method of accounting to an entity can also require us to evaluate whether that entity is considered a variable interest entity (VIE). This evaluation, along with the determination of our ability to control, direct or exert significant influence over an entity involves the use of judgment. We apply the equity method of accounting where we can exert significant influence over, but do not control or direct the policies, decisions or activities of an entity and in the case of a VIE, are not the primary beneficiary. We use the cost method of accounting where we are unable to exert significant influence over the entity. All of our consolidated entities and equity method investments are not VIEs except for our investment in Crestwood Permian Basin Holdings LLC (Crestwood Permian).

Our equity interest in Crestwood Permian is considered a VIE because CEQP has provided a guarantee to a third party that requires CEQP to pay up to $10 million if Crestwood Permian fails to honor its obligations to its equity investee, Crestwood Permian Basin LLC (Crestwood Permian Basin), in the event Crestwood Permian Basin fails to satisfy its obligations under its gas gathering agreement with a third party. We account for our investment in Crestwood Permian as an equity method investment because we are not the primary beneficiary of the VIE as of December 31, 2020 and 2019. See Note 6 for a further discussion of our investment in Crestwood Permian.

Use of Estimates

The preparation of our consolidated financial statements in conformity with GAAP requires the use of estimates and assumptions that affect the amounts we report as assets, liabilities, revenues and expenses and our disclosures in these consolidated financial statements. Actual results can differ from those estimates.

Cash

We consider all highly liquid investments with an original maturity of less than three months to be cash.

Accounts Receivable

Effective January 1, 2020, we adopted the provisions of ASU 2016-13, Financial Instruments - Credit Losses (Topic 326), which provides revised guidance on evaluating accounts and notes receivable and other financial instruments for impairment. We record accounts receivable when products or services are delivered and it is probable that payment will be received for those products or services, and we do not record any interest or penalties on accounts receivable that are past due under the terms of the related arrangement or invoice until those amounts are received. Topic 326 requires companies to evaluate their financial instruments for impairment by recording an allowance for doubtful accounts and/or bad debt expense based on certain categories of instruments rather than a specific identification approach. We adopted the provisions of this standard using a method to estimate the allowance for doubtful accounts that considered both the aging of our accounts receivable and the projected loss rate of our receivables. We write off accounts receivable, and the related allowance for doubtful accounts, when it becomes remote that payment for products or services will be received. On January 1, 2020, we recorded a $0.7 million increase to our allowance for doubtful accounts and a $0.7 million decrease to partners’ capital to reflect the cumulative effect of adopting the new standard. In addition, on January 1, 2020, Crestwood Permian, our 50% equity investment, also adopted the provisions of Topic 326 and we recorded a decrease of approximately $0.2 million to our equity investment and a corresponding decrease to our partners’ capital to reflect our proportionate share of the cumulative effect of accounting change recorded by the equity investment related to the new standard. The adoption of this standard was not material to our other equity investments. Our allowance for doubtful accounts was approximately $0.9 million at December 31, 2020.

Inventory

Our inventory is stated at the lower of cost or net realizable value and cost is computed predominantly using the average cost method. Inventory consisted of the following at December 31, 2020 and 2019 (in millions):


	December 31,
	2020		2019
NGLs, crude oil and natural gas	$	88.0	$	53.2
Spare parts	1.1		0.5
Total inventory	$	89.1	$	53.7

Property, Plant and Equipment

Property, plant and equipment is recorded at is original cost of construction or, upon acquisition, at the fair value of the assets acquired. For assets we construct, we capitalize direct costs, such as labor and materials, and indirect costs, such as overhead and interest. We capitalize major units of property replacements or improvement and expense minor items. Depreciation is computed by the straight-line method over the estimated useful lives of the assets, as follows:


			Years
Gathering systems and pipelines			15 - 20
Facilities and equipment			3 - 25
Buildings, rights-of-way and easements			1 - 40
Office furniture and fixtures			5- 10
Vehicles			5

We evaluate our long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If such events or changes in circumstances are present, a loss is recognized if the carrying value of the asset is in excess of the sum of the undiscounted cash flows expected to result from the use of the asset and its eventual disposition. An impairment loss is measured as the amount by which the carrying amount of the asset exceeds the fair value of the asset, which is typically based on discounted cash flow projections using assumptions as to revenues, costs and discount rates typical of third party market participants, which is a Level 3 fair value measurement.

During 2020 and 2019, we recorded $3.1 million and $4.3 million of impairments of our property, plant and equipment primarily related to the removal and retirement of certain water gathering facilities in response to several produced water releases on our Arrow system over the past few years, which is further discussed in Note 10. We did not record any other material impairments of our property, plant and equipment during the years ended December 31, 2020, 2019 or 2018. During 2020, we sold our Fayetteville assets and recorded a loss on long-lived assets of approximately $19.9 million and during 2018, we sold our MS&L West Coast operations and recorded a loss on long-lived assets of approximately $26.9 million. See Note 3 for a further discussion of these asset sales.

Projected cash flows of our property, plant and equipment are generally based on current and anticipated future market conditions, which require significant judgment to make projections and assumptions about pricing, demand, competition, operating costs, constructions costs, legal and regulatory issues and other factors that may extend many years into the future and are often outside of our control. Due to the imprecise nature of these projections and assumptions, actual results can and often do, differ from our estimates.

Identifiable Intangible Assets

Our identifiable intangible assets consist of customer accounts, trademarks and certain revenue contracts. These intangible assets have arisen primarily from acquisitions. We amortize certain of our revenue contracts based on the projected cash flows associated with these contracts if the projected cash flows are readily determinable, otherwise we amortize our revenue contracts on a straight-line basis. We recognize acquired intangible assets separately if the benefit of the intangible asset is obtained through contractual or other legal rights, or if the intangible asset can be sold, transferred, licensed, rented or exchanged, regardless of the acquirer’s intent to do so.

Projected cash flows of our intangible assets are generally based on current and anticipated future market conditions, which require significant judgment to make projections and assumptions about pricing, demand, competition, operating costs, construction costs, legal and regulatory issues and other factors that may extend many years into the future and are often outside of our control. Due to the imprecise nature of these projections and assumptions, actual results can and often do, differ from our estimates.

We did not record any impairments of our intangible assets during the years ended December 31, 2020, 2019 and 2018.

Certain intangible assets are amortized on a straight-line basis over their estimated economic lives, as follows:


			Weighted-Average Life (years)
Customer accounts			22
Revenue contracts			18
Trademarks			10

Goodwill

Our goodwill represents the excess of the amount we paid for a business over the fair value of the net identifiable assets acquired. We evaluate goodwill for impairment annually on December 31, and whenever events indicate that it is more likely than not that the fair value of a reporting unit could be less than its carrying amount. This evaluation requires us to compare the fair value of each of our reporting units to its carrying value (including goodwill). If the fair value exceeds the carrying amount, goodwill of the reporting unit is not considered impaired.

We estimate the fair value of our reporting units based on a number of factors, including discount rates, projected cash flows and the potential value we would receive if we sold the reporting unit. Estimating projected cash flows requires us to make certain assumptions as it relates to the future operating performance of each of our reporting units (which includes assumptions, among others, about estimating future operating margins and related future growth in those margins, contracting efforts and the cost and timing of facility expansions) and assumptions related to our customers, such as their future capital and operating plans and their financial condition. When considering operating performance, various factors are considered such as current and changing economic conditions and the commodity price environment, among others. Due to the imprecise nature of these projections and assumptions, actual results can and often do, differ from our estimates. If the assumptions embodied in the projections prove inaccurate, we could incur a future impairment charge. In addition, the use of the income approach to determine the fair value of our reporting units (see further discussion of the use of the income approach below) could result in a different fair value if we had utilized a market approach, or a combination thereof.

The following table summarizes the goodwill of our reporting units (in millions):


	G&P				MS&L
	Arrow		Powder River Basin		NGL Marketing and Logistics		Total
January 1, 2019	$	45.9	$	—	$	92.7	$	138.6
Jackalope Acquisition (Note 3)	—		80.3		—		80.3
December 31, 2019	45.9		80.3		92.7		218.9
Impairment	—		(80.3)		—		(80.3)
December 31, 2020	$	45.9	$	—	$	92.7	$	138.6

During 2020, current and forward commodity prices significantly declined from their levels at December 31, 2019 due primarily to the decreases in energy demand as a result of the outbreak of the COVID-19 pandemic and actions taken by the Organization of the Petroleum Exporting Countries, Russia, the United States and other oil-producing countries relating to the oversupply of oil. We believe that the decrease in commodity prices has had and will continue to have a negative impact on certain of our customers in our gathering and processing segment, which could adversely impact the financial performance of certain of the reporting units within those operations.

Upon acquisition, we are required to record the assets, liabilities and goodwill of a reporting unit at its fair value on the date of acquisition. As a result, any level of decrease in the forecasted cash flows of these businesses or increases in the discount rates utilized to value those businesses from their respective acquisition dates would likely result in the fair value of the reporting unit falling below the carrying value of the reporting unit, and could result in an assessment of whether that reporting unit’s goodwill is impaired.

We acquired our Powder River Basin reporting unit in 2019 and recorded it at fair value at that time. Based on the events that occurred during 2020 described above, we determined that the forecasted cash flows, and therefore the fair value, of our Powder River Basin reporting unit significantly decreased during 2020, and accordingly performed a quantitative impairment assessment of the goodwill related to that reporting unit during that period. Based on our quantitative assessment, which utilized the income approach, we determined that the goodwill associated with the Powder River Basin reporting unit should be fully impaired, and accordingly we recorded an $80.3 million impairment of the goodwill attributed to that reporting unit during the year ended December 31, 2020. We did not record any impairments of the goodwill associated with our Arrow or NGL Marketing and Logistics reporting units during 2020, as we did not have indicators that it was more likely than not that the fair value of those reporting units had declined to below their carrying value at December 31, 2020. At December 31, 2020, our accumulated goodwill impairments at CEQP and CMLP were approximately $1,736.8 million and $1,479.6 million, respectively.

Leases

We enter into leases with third parties for the right to utilize certain office buildings, crude oil railroad cars, vehicles and other operating facilities and equipment. For contracts that extend for a period greater than 12 months, we recognize a right of use asset and a corresponding lease liability on our consolidated balance sheet based on the present value of each lease, which is based on the future minimum lease payments and is determined by discounting these payments using an incremental borrowing rate. We recognize operating lease expense on our consolidated statements of operations as either costs of product/services sold, general and administrative expenses or operations and maintenance expenses on a straight-line basis over the lease term. We do not have any material leases where we are considered to be the lessor. Our lease agreements do not contain any material residual value guarantees or material restrictive covenants. We do not have any material revenue contracts that are considered leases.

Investments in Unconsolidated Affiliates

Equity method investments in which we exercise significant influence, but do not control and are not the primary beneficiary, are accounted for using the equity method of accounting. Differences in the basis of investments and the separate net asset values of the investees, if any, are amortized into net income or loss over the remaining useful lives of the underlying assets and liabilities, except for the excess related to goodwill. We evaluate our equity method investments for impairment when events or circumstances indicate that the carrying value of the equity method investment may be impaired and that impairment is other than temporary. If an event occurs, we evaluate the recoverability of our carrying value based on the fair value of the investment. If an impairment is indicated, or if we decide to sell an investment in an unconsolidated affiliate, we adjust the carrying values of the asset downward, if necessary, to their estimated fair values. We did not record impairments of our equity method investments during the years ended December 31, 2020, 2019 and 2018.

Asset Retirement Obligations

An asset retirement obligation (ARO) is an estimated liability for the cost to retire a tangible asset. We record a liability for legal or contractual obligations to retire our long-lived assets associated with our facilities and right-of-way contracts we hold. We record a liability in the period the obligation is incurred and estimable. An ARO is initially recorded at its estimated fair value with a corresponding increase to property, plant and equipment. This increase in property, plant and equipment is then depreciated over the useful life of the asset to which that liability relates. An ongoing expense is recognized for changes in the fair value of the liability as a result of the passage of time, which we record as depreciation, amortization and accretion expense on our consolidated statements of operations.

We have various obligations to remove property, plant and equipment on rights-of-way and leases for which we cannot currently estimate the fair value of those obligations because the associated assets have indeterminate lives. An asset retirement obligation liability (and related assets), if any, will be recorded for these obligations once sufficient information is available to reasonably estimate the fair value of the obligations. Our current AROs are reflected in accrued expenses and other liabilities and our long-term AROs are reflected in other long-term liabilities on our consolidated balance sheets.

Deferred Financing Costs

Deferred financing costs represent costs associated with obtaining long-term financing and are amortized over the term of the related debt using a method which approximates the effective interest method and has a weighted average remaining life of four years. Our net deferred financing costs are reflected as a reduction of long-term debt on our consolidated balance sheets.

Revenue Recognition

We provide gathering, processing, compression, storage, fractionation, and transportation (consisting of pipelines, truck and rail terminals, truck/trailer units and rail cars) services and we sell commodities (including crude oil, natural gas and NGLs) under various contracts. These contracts include:

•Fixed-fee contracts. Under these contracts, we do not take title to the underlying crude oil, natural gas, NGLs and water but charge our customers a fixed-fee for the services we provide, which can be a firm reservation charge and/or a charge per volume gathered, processed, compressed, stored, loaded and/or transported (which, in certain contracts, can be subject to a minimum level of volumes);

•Percentage-of-proceeds service contracts. Under these contracts, we take title to crude oil, natural gas or NGLs after the commodity leaves our gathering and processing facilities. We often market and sell those commodities to third parties after they leave our facilities and we will remit a portion of the sales proceeds to our producers;

•Percentage-of-proceeds product contracts. Under these contracts, we take title to crude oil, natural gas or NGLs before the commodity enters our facilities. We market and sell those commodities to third parties and we will remit a portion of the sales proceeds to our producers; and

•Purchase and sale contracts. Under these contracts, we purchase crude oil, natural gas or NGLs before the commodity enters our facilities, and we market and sell those commodities to third parties.

On January 1, 2018, we adopted the provisions of ASU 2014-09, Revenue from Contracts with Customers (Topic 606), which outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers. We adopted the standard using the modified retrospective method for all revenue contracts that involve revenue generating activities that occur after January 1, 2018. On January 1, 2018, we recorded a net increase of $7.5 million to our partners’ capital (including a $9.5 million decrease to reflect our proportionate share of the cumulative effect of accounting change related to Jackalope’s adoption of the new standard) as a result of applying the cumulative impact of adopting the new standard.

We recognize revenues for services and products under revenue contracts as our obligations to perform services or deliver/sell products under the contracts are satisfied. A contract’s transaction price is allocated to each performance obligation in the contract and recognized as revenue when, or as, the performance obligation is satisfied. Our fixed-fee contracts and our percentage-of-proceeds service contracts primarily have a single performance obligation to deliver a series of distinct goods or services that are substantially the same and have the same pattern of transfer to our customers. For performance obligations associated with these contracts, we recognize revenues over time utilizing the output method based on the actual volumes of products delivered/sold or services performed, because the single performance obligation is satisfied over time using the same performance measure of progress toward satisfaction of the performance obligation. The transaction price under certain of our fixed-fee contracts and percentage-of-proceeds service contracts includes variable consideration that varies primarily based on actual volumes that are delivered under the contracts. Because the variable consideration specifically relates to our efforts to transfer the services and/or products under the contracts, we allocate the variable consideration entirely to the distinct service utilizing the allocation exception guidance under Topic 606, and accordingly recognize the variable consideration as revenues at the time the good or service is transferred to the customer.

Certain of our fixed-fee contracts contain minimum volume features under which the customers must utilize our services to gather, compress or load a specified quantity of crude oil or natural gas or pay a deficiency fee based on the difference between actual volumes and the contractual minimum volume. We recognize revenues from these contracts when actual volumes are gathered, compressed or loaded and the likelihood of a customer exercising its remaining rights to make up the deficient volumes under minimum volume commitments becomes remote.

We recognize revenues at a point in time for performance obligations associated with our percentage-of proceeds product contracts and purchase and sale contracts, and these revenues are recognized because control of the underlying product is transferred to the customer when the distinct good is provided to the customer.

The evaluation of when performance obligations have been satisfied and the transaction price that is allocated to our performance obligations requires significant judgments and assumptions, including our evaluation of the timing of when control of the underlying good or service has transferred to our customers and the relative standalone selling price of goods and services provided to customers under contracts with multiple performance obligations. Actual results can significantly vary from those judgments and assumptions. We did not have any material contracts with multiple performance obligations or under which we receive material amounts of non-cash consideration during the year ended December 31, 2020.

Amounts due from our customers under our revenue contracts are typically billed as the service is being provided or on a weekly, bi-weekly or monthly basis and are due within 30 days of billing. Under certain of our contracts, we recognize revenues in excess of billings which we present as contract assets on our consolidated balance sheets.

Under certain contracts, we are entitled to receive payments in advance of satisfying our performance obligations under the contracts. We recognize a liability for these payments in excess of revenue recognized and present it as deferred revenue or contract liabilities on our consolidated balance sheets. Our deferred revenue primarily relates to:

•Capital Reimbursements. Certain contracts in our G&P segment require that our customers reimburse us for capital expenditures related to the construction of long-lived assets utilized to provide services to them under the respective revenue contracts. Because we consider these amounts as consideration from customers associated with ongoing services to be provided to customers, we defer these upfront payments in deferred revenue and recognize the amounts in revenue over the life of the associated revenue contract as the performance obligations are satisfied under the contract.

•Contracts with Increasing (Decreasing) Rates per Unit. Certain of our contracts have fixed rates per volume that increase and/or decrease over the life of the contract once certain time periods or thresholds are met. We record revenues on these contracts ratably per unit over the life of the contract based on the remaining performance obligations to be performed, which can result in the deferral of revenue for the difference between the consideration received and the ratable revenue recognized.

Credit Risk and Concentrations

Inherent in our contractual portfolio are certain credit risks. Credit risk is the risk of loss from nonperformance by suppliers, customers or financial counterparties to a contract. We take an active role in managing credit risk and have established control procedures, which are reviewed on an ongoing basis. We attempt to minimize credit risk exposure through credit policies and periodic monitoring procedures as well as through customer deposits, letters of credit and entering into netting agreements that allow for offsetting counterparty receivable and payable balances for certain financial transactions, as deemed appropriate.

Income Taxes

Crestwood Equity is a master limited partnership and Crestwood Midstream is a limited partnership. Partnerships are generally not subject to federal income tax, although publicly-traded partnerships are treated as corporations for federal income tax purposes and therefore are subject to federal income tax, unless the partnership generates at least 90% of its gross income from qualifying sources. If the qualifying income requirement is satisfied, the publicly-traded partnership will be treated as a partnership for federal income tax purposes. We satisfy the qualifying income requirement and are treated as a partnership for federal and state income tax purposes. Our consolidated earnings are included in the federal and state income tax returns of our partners. However, legislation in certain states allows for taxation of partnerships, and as such, certain state taxes have been included in our accompanying financial statements as income taxes due to the nature of the tax in those particular states as discussed below. In addition, federal and state income taxes are provided on the earnings of the subsidiaries incorporated as taxable entities. We are required to recognize deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the financial statements or tax returns. Under this method, deferred tax assets and liabilities are determined based on the differences between the financial reporting and tax basis of assets and liabilities using expected rates in effect for the year in which the differences are expected to reverse.

We are responsible for the Texas Margin tax included in our Texas franchise tax returns. The margin tax qualifies as an income tax under GAAP, which requires us to recognize the impact of this tax on the temporary differences between the financial statement assets and liabilities and their tax basis attributable to such tax.

Net earnings for financial statement purposes may differ significantly from taxable income reportable to unitholders as a result of differences between the tax basis and the financial reporting basis of assets and liabilities and the taxable income allocation requirements under the partnership agreement.

Environmental Costs and Other Contingencies

We recognize liabilities for environmental and other contingencies when there is an exposure that indicates it is both probable that a liability has been incurred and the amount of loss can be reasonably estimated. Where the most likely outcome of a contingency can be reasonably estimated, we accrue a liability for that amount. Where the most likely outcome cannot be estimated, a range of potential losses is established and if no one amount in that range is more likely than any other, the low end of range is accrued.

We record liabilities for environmental contingencies at their undiscounted amounts on our consolidated balance sheets as accrued expenses and other liabilities when environmental assessments indicate that remediation efforts are probable and costs can be reasonably estimated. Estimates of our liabilities are based on currently available facts and presently enacted laws and regulations, taking into consideration the likely effects of other societal and economic factors. These estimates are subject to revision in future periods based on actual costs or new circumstances. We capitalize costs that benefit future periods and recognize a current period charge in operations and maintenance expenses when clean-up efforts do not benefit future periods.

We evaluate potential recoveries of amounts from third parties, including insurance coverage, separately from our liability. Recovery is evaluated based on the solvency of the third party, among other factors. When recovery is assured, we record and report an asset separately from the associated liability on our consolidated balance sheet.

Price Risk Management Activities

We utilize certain derivative financial instruments to (i) manage our exposure to commodity price risk, specifically, the related change in the fair value of inventory, as well as the variability of cash flows related to forecasted transactions; and (ii) ensure the availability of adequate physical supply of commodity. We record all derivative instruments as either assets or liabilities on our consolidated balance sheets at their fair values. Changes in the fair value of these derivative financial instruments are recorded through current earnings.

We do not have any derivatives designated as fair value hedges or cash flow hedges for accounting purposes.

Unit-Based Compensation

Long-term incentive awards are granted under the Crestwood Equity Partners LP Long Term Incentive Plan (Crestwood LTIP). Unit-based compensation awards consist of restricted units and performance units that are recognized in our consolidated statements of operations based on their grant date at fair value. For restricted units, we generally recognize the expense over the vesting period on a straight line basis. For performance units, we remeasure compensation expense at each balance sheet date because the vesting is subject to the attainment of certain performance and market goals over a three-year period. For those awards that are settled in cash, the associated liability is remeasured at every balance sheet date through settlement, such that the vested portion of the liability is adjusted to reflect its revised fair value through compensation expense.

Acquisitions and Divestitures

12 Months Ended

Dec. 31, 2020

Business Combinations [Abstract]

Divestitures

Acquisitions

NGL Asset Acquisition

In April 2020, we acquired several NGL storage and rail-to-truck terminals from Plains All American Pipeline, L.P. for approximately $162 million (NGL Asset Acquisition). The acquired assets include 7 MMBbls of NGL storage and seven terminals, and resulted in an increase of approximately $110 million to our property, plant and equipment, $50 million to our intangible assets and $2 million to our other assets and liabilities, net. The identifiable intangible assets primarily consist of customer accounts with a weighted-average remaining life of 20 years on the date of acquisition. We allocated the purchase price to these assets and liabilities based on their fair values, which are Level 3 fair value measurements and were developed by management with the assistance of a third-party valuation firm utilizing market-related information about the property, plant

and equipment and customer relationships acquired. These assets are included in our marketing, supply and logistics segment. The transaction costs related to this acquisition were not material during the year ended December 31, 2020.

Jackalope Acquisition

On April 9, 2019, Crestwood Niobrara LLC (Crestwood Niobrara), our consolidated subsidiary, acquired Williams’s 50% equity interest in Jackalope Gas Gathering Services, L.L.C. (Jackalope) for approximately $484.6 million (Jackalope Acquisition). The acquisition was funded through a combination of borrowings under the CMLP credit facility and the issuance of $235 million of new preferred units to CN Jackalope Holdings LLC (Jackalope Holdings) (see Note 12 for a further discussion of the issuance of the new preferred units). Prior to the Jackalope Acquisition, Crestwood Niobrara owned a 50% equity interest in Jackalope, which we accounted for under the equity method of accounting. As a result of this transaction, Crestwood Niobrara controls and owns 100% of the equity interests in Jackalope. Transaction costs related to the Jackalope Acquisition were approximately $2.8 million during the year ended December 31, 2019. These costs are included in operations and maintenance expenses in our consolidated statements of operations.

The fair values of the assets acquired and liabilities assumed were determined primarily utilizing market-related information and other projections on the anticipated performance of the assets acquired, including an analysis of the future discounted cash flows to be generated by the acquired assets at a discount rate of approximately 12%. Those fair values are Level 3 fair value measurements and were developed by management with the assistance of a third-party valuation firm.

The following table summarizes the final valuation of the assets acquired and liabilities assumed at the acquisition date (in millions):



Cash	$	22.5
Other current assets	30.9
Property, plant and equipment	532.9
Intangible assets	306.0
Goodwill	80.3

Current liabilities	(30.4)
Other long-term liabilities	(21.5)
Estimated fair value of 100% interest in Jackalope	920.7
Less:
Elimination of equity investment in Jackalope	226.7
Gain on acquisition of Jackalope	209.4
Total purchase price	$	484.6

The identifiable intangible assets primarily consists of a customer contract with a weighted-average remaining life of 17 years on the date of acquisition. The goodwill recognized related primarily to anticipated operating synergies between the assets acquired and our existing operations. The fair value of the assets acquired and liabilities assumed in the Jackalope Acquisition exceeded the sum of the cash consideration paid and the historical book value of our 50% equity interest in Jackalope (which was remeasured at fair value and derecognized) and, as a result, we recognized a gain of approximately $209.4 million during the year ended December 31, 2019. This gain is included in gain on acquisition in our consolidated statements of operations.

Our consolidated statements of operations include the results of Jackalope in our gathering and processing segment since April 9, 2019, the closing date of the acquisition. During the year ended December 31, 2019, we recognized approximately $70.1 million of revenues and $20.9 million of net income related to Jackalope’s operations.

The tables below presents selected unaudited pro forma information as if the Jackalope Acquisition had occurred on January 1, 2018 (in millions). The pro forma information is not necessarily indicative of the financial results that would have occurred if the transaction had been completed as of the dates indicated. The amounts have been calculated after applying our accounting policies and adjusting the results to reflect the depreciation, amortization and accretion expense that would have been charged assuming the fair value adjustments to property, plant and equipment and intangible assets had been made at the beginning of the respective reporting period. The pro forma net income also includes the effects of interest expense on incremental borrowings and recognition of deferred revenue.

Crestwood Equity


	Year Ended December 31,
	2019		2018
Revenues	$	3,202.6	$	3,729.5
Net income	$	313.5	$	45.0

Crestwood Midstream


	Year ended December 31,
	2019		2018
Revenues	$	3,202.6	$	3,729.5
Net income	$	304.2	$	36.6

Divestitures

Fayetteville Assets

On October 1, 2020, we sold our gathering systems in the Fayetteville Shale to a third party for approximately $23 million, and during the year ended December 31, 2020, we recognized a loss on the sale of approximately $19.9 million, which is included in loss on long-lived assets, net on our consolidated statement of operations. The sale of our Fayetteville assets resulted in a decrease of approximately $44.4 million of property, plant and equipment, net and a decrease of approximately $1.4 million in our asset retirement obligation liabilities. Our Fayetteville assets were previously included in our gathering and processing segment and consisted of five natural gas gathering systems and related compression, dehydration and treating facilities located in Arkansas.

West Coast Assets

In October 2018, we sold our West Coast assets to a third party for proceeds of approximately $70.5 million. During the year ended December 31, 2018, we recognized a loss from the sale of approximately $26.9 million, which is included in loss on long-lived assets, net in our consolidated statement of operations. Our West Coast assets were previously included in our marketing, supply and logistics segment.

Certain Balance Sheet Information

12 Months Ended

Dec. 31, 2020

Balance Sheet Related Disclosures [Abstract]

Certain Balance Sheet Information

Property, Plant and Equipment

Property, plant and equipment consisted of the following at December 31, 2020 and 2019 (in millions):


	CEQP				CMLP
	December 31,				December 31,
	2020		2019		2020		2019
Gathering systems and pipelines and related assets	$	1,050.8	$	1,017.8	$	1,193.6	$	1,160.6
Facilities and equipment	2,177.9		1,797.7		2,363.0		1,982.8
Buildings, land, rights-of-way, storage rights and easements	389.0		370.6		392.7		374.3
Vehicles	13.9		12.8		12.1		11.1
Construction in process	83.6		368.7		83.6		368.7
Finance leases	13.3		14.9		13.3		14.9
Office furniture and fixtures	31.1		30.0		31.3		30.2
	3,759.6		3,612.5		4,089.6		3,942.6
Less: accumulated depreciation	842.5		703.4		1,028.3		875.1
Total property, plant and equipment, net	$	2,917.1	$	2,909.1	$	3,061.3	$	3,067.5

Depreciation. CEQP’s depreciation expense totaled $174.8 million, $139.5 million and $123.6 million for the years ended December 31, 2020, 2019 and 2018. CMLP’s depreciation expense totaled $188.9 million, $153.5 million and $137.7 million for the years ended December 31, 2020, 2019 and 2018.

Capitalized Interest. During the years ended December 31, 2020, 2019 and 2018, CEQP and CMLP capitalized interest of $2.7 million, $14.4 million and $5.0 million related to certain expansion projects.

Intangible Assets

Our intangible assets consisted of the following at December 31, 2020 and 2019 (in millions):


	December 31,
	2020		2019
Customer accounts(1)	$	488.7	$	438.9

Revenue contracts	631.2		631.2


Trademarks	6.2		6.2

	1,126.1		1,076.3
Less: accumulated amortization	331.8		271.1
Total intangible assets, net	$	794.3	$	805.2

(1)As of December 31, 2020, this amount includes $49.8 million related to customer accounts acquired in conjunction with the NGL Asset Acquisition which is further discussed in Note 3.

The following table summarizes total accumulated amortization of our intangible assets at December 31, 2020 and 2019 (in millions):


	December 31,
	2020		2019
Customer accounts	$	158.5	$	134.4

Revenue contracts	168.6		132.5


Trademarks	4.7		4.2

Total accumulated amortization	$	331.8	$	271.1

Crestwood Equity’s amortization expense related to its intangible assets for the years ended December 31, 2020, 2019 and 2018, was approximately $60.7 million, $54.6 million and $43.5 million. Crestwood Midstream’s amortization expense related to its intangible assets for the years ended December 31, 2020, 2019 and 2018 was approximately $60.7 million, $54.6 million and $42.1 million.

Estimated amortization of our intangible assets for the next five years is as follows (in millions):


Year Ending December 31,
2021	$	61.4
2022	$	61.4
2023	$	57.6
2024	$	54.2
2025	$	51.5

Accrued Expenses and Other Liabilities

Accrued expenses and other liabilities consisted of the following at December 31, 2020 and 2019 (in millions):


	CEQP				CMLP
	December 31,				December 31,
	2020		2019		2020		2019
Accrued expenses	$	48.3	$	61.6	$	46.4	$	60.3
Accrued property taxes	8.4		6.1		8.4		6.1

Income tax payable	0.2		0.3		0.2		0.3
Interest payable	24.9		25.6		24.9		25.6
Accrued additions to property, plant and equipment	12.3		38.0		12.3		38.0
Operating leases	14.7		18.1		14.7		18.1
Finance leases	2.9		3.2		2.9		3.2
Deferred revenue	10.3		8.8		10.3		8.8

Total accrued expenses and other liabilities	$	122.0	$	161.7	$	120.1	$	160.4

Other Long-Term Liabilities

Other long-term liabilities consisted of the following at December 31, 2020 and 2019 (in millions):


	CEQP				CMLP
	December 31,				December 31,
	2020		2019		2020		2019
Contract liabilities	$	172.2	$	144.7	$	172.2	$	144.7
Operating leases	28.5		41.5		28.5		41.5
Asset retirement obligations	34.1		33.3		34.1		33.3
Other	18.5		25.1		17.0		19.1
Total other long-term liabilities	$	253.3	$	244.6	$	251.8	$	238.6

Asset Retirement Obligations

12 Months Ended

Dec. 31, 2020

Asset Retirement Obligation Disclosure [Abstract]

Asset Retirement Obligation

Asset Retirement ObligationsWe have legal obligations associated with our facilities and right-of-way contracts we hold. Where we can reasonably estimate the ARO, we accrue a liability based on an estimate of the timing and amount of settlement. We record changes in these estimates based on changes in the expected amount and timing of payments to settle our obligations. We did not have any material assets that were legally restricted for use in settling asset retirement obligations as of December 31, 2020 and 2019.

The following table presents the changes in our net asset retirement obligations for the years ended December 31, 2020 and 2019 (in millions):


	December 31,
	2020		2019
Net asset retirement obligations at January 1	$	34.8	$	28.1
Liabilities acquired(1)	0.3		1.7
Liabilities incurred	0.3		3.4
Liabilities settled	(0.8)		(0.1)
Accretion expense	1.9		1.7
Other(2)	(1.4)		—
Net asset retirement obligations at December 31(3)	$	35.1	$	34.8

(1)Primarily relates to the NGL Asset Acquisition in 2020 and the Jackalope Acquisition in 2019. See Note 3 for a further discussion of these acquisitions.

(2)Relates to obligations included in the sale of our Fayetteville assets. See Note 3 for a further discussion of this divestiture.

(3)Includes $1.0 million and $1.5 million of current ARO liabilities at December 31, 2020 and 2019.

Investments in Unconsolidated Affiliates

12 Months Ended

Dec. 31, 2020

Equity Method Investments and Joint Ventures [Abstract]

Investments in Unconsolidated Affiliates

Variable Interest Entity

Crestwood Infrastructure Holdings LLC (Crestwood Infrastructure), our wholly-owned subsidiary, owns a 50% equity interest in Crestwood Permian and an affiliate of First Reserve owns the remaining 50% equity interest in Crestwood Permian. We manage and account for our ownership interest in Crestwood Permian, which is a VIE, under the equity method of accounting as we exercise significant influence, but do not control Crestwood Permian and we are not its primary beneficiary due to First Reserve’s rights to exercise control over the entity.

Net Investments and Earnings (Loss)

We account for each of our investments in unconsolidated affiliates under the equity method of accounting. Our Stagecoach Gas Services LLC (Stagecoach Gas), Tres Palacios Holdings LLC (Tres Holdings) and Powder River Basin Industrial Complex, LLC (PRBIC) equity investments are included in our storage and transportation segment. Our Crestwood Permian equity investment is included in our gathering and processing segment.

Our net investments in and earnings (loss) from our unconsolidated affiliates are as follows (in millions, unless otherwise stated):


	Ownership Percentage		Investment				Earnings (Loss) from Unconsolidated Affiliates
	December 31,		December 31,				Year Ended December 31,
	2020		2020		2019		2020		2019		2018
Stagecoach Gas Services LLC	50.00	%	$	792.5	$	814.4	$	37.8	$	34.2	$	29.3
Tres Palacios Holdings LLC	50.01	%	35.5		35.9		—		0.9		—
Powder River Basin Industrial Complex, LLC	50.01	%	3.6		8.3		(4.3)		(0.2)		1.5
Crestwood Permian Basin Holdings LLC	50.00	%	112.1		121.8		(1.0)		(5.8)		4.4
Jackalope Gas Gathering Services, L.L.C.(1)	—	%	—		—		—		3.7		18.1
Total			$	943.7	$	980.4	$	32.5	$	32.8	$	53.3

(1)On April 9, 2019, Crestwood Niobrara acquired Williams’s 50% equity interest in Jackalope and, as a result, Crestwood Niobrara controls and owns 100% of the equity interests in Jackalope. Our Jackalope equity investment was previously included in our gathering and processing segment. See Note 3 for a further discussion of this acquisition.

Summarized Financial Information of Unconsolidated Affiliates

Below is summarized financial information for our significant unconsolidated affiliates (in millions; amounts represent 100% of unconsolidated affiliate information):

Financial Position Data


	December 31,
	2020										2019
	Current Assets		Non-Current Assets		Current Liabilities		Non-Current Liabilities		Members’ Equity		Current Assets		Non-Current Assets		Current Liabilities		Non-Current Liabilities		Members’ Equity
Stagecoach Gas (1)	$	47.4	$	1,645.5	$	3.9	$	1.4	$	1,687.6	$	50.6	$	1,686.3	$	3.9	$	1.5	$	1,731.5
Other(2)	23.5		661.9		33.6		233.7		418.1		27.6		664.7		37.3		193.2		461.8
Total	$	70.9	$	2,307.4	$	37.5	$	235.1	$	2,105.7	$	78.2	$	2,351.0	$	41.2	$	194.7	$	2,193.3

(1)As of December 31, 2020, our equity in the underlying net assets of Stagecoach Gas exceeded our investment balance by approximately $51.3 million. This excess amount is entirely attributable to goodwill and, as such, is not subject to amortization.

(2)Includes our Crestwood Permian, Tres Holdings and PRBIC equity investments. As of December 31, 2020, our equity in the underlying net assets of Crestwood Permian exceeded our investment balance by approximately $8.7 million, and this excess amount is not subject to amortization. As of December 31, 2020, our equity in the underlying net assets of Tres Holdings exceeded our investment balance by approximately $22.7 million. As of December 31, 2020, our equity in the underlying net assets of PRBIC approximates our investment balance. During the year ended December 31, 2020, we recorded our share of a long-lived asset impairment recorded by our PRBIC equity investment, which eliminated our $5.5 million historical basis difference between our investment and the equity in the underlying net assets of PRBIC.

Operating Results Data


	Year Ended December 31,
	2020						2019						2018
	Operating Revenues		Operating Expenses		Net Income (Loss)		Operating Revenues		Operating Expenses		Net Income		Operating Revenues		Operating Expenses		Net Income
Stagecoach Gas	$	154.3	$	78.8	$	75.5	$	163.8	$	83.6	$	80.6	$	171.4	$	79.3	$	92.1
Crestwood Permian	89.7		92.7		(2.6)		64.8		76.0		(11.1)		82.2		81.3		5.7
Other(1)	31.6		53.4		(22.0)		55.1		49.9		5.1		116.9		81.5		35.6
Total	$	275.6	$	224.9	$	50.9	$	283.7	$	209.5	$	74.6	$	370.5	$	242.1	$	133.4

(1)Includes our Tres Holdings, PRBIC and Jackalope (prior to the acquisition of the remaining 50% interest from Williams in April 2019) equity investments. We amortize the excess basis in certain of our equity investments as an increase in our earnings from unconsolidated affiliates. We recorded amortization of the excess basis in our Tres Holdings equity investment of approximately $1.3 million for each of the years ended December 31, 2020, 2019 and 2018, which we amortize over the life of Tres Palacios’s sublease agreement. We recorded amortization of the excess basis in our PRBIC equity investment of approximately $0.4 million and $0.5 million for the years ended December 31, 2019 and 2018, which we amortized over the life of PRBIC’s property, plant and equipment. We recorded amortization of the excess basis in our Jackalope equity investment of less than $0.1 million for each of the years ended December 31, 2019 and 2018, which we amortized over the life of Jackalope’s gathering and processing agreement with Chesapeake Energy Corporation (Chesapeake).

Distributions and Contributions


	Distributions						Contributions
	Year Ended December 31,						Year Ended December 31,
	2020		2019		2018		2020		2019		2018
Stagecoach Gas(1)	$	59.7	$	52.3	$	48.7	$	—	$	2.1	$	—
Tres Holdings	6.4		6.3		5.3		6.0		6.3		2.5
PRBIC	0.4		—		1.9		—		0.2		0.2
Crestwood Permian(1)	11.9		5.0		14.7		3.4		28.3		12.6
Jackalope	—		11.6		32.4		—		24.4		49.1
Total	$	78.4	$	75.2	$	103.0	$	9.4	$	61.3	$	64.4

(1)In January 2021, we received cash distributions from Stagecoach Gas and Crestwood Permian of approximately $14.0 million and $3.3 million, respectively. In January 2021, we made cash contributions of approximately $6.9 million and $3.3 million to our Tres Holdings and Crestwood Permian equity investments.

Other

Contingent Consideration. Pursuant to the Stagecoach Gas limited liability company agreement, we are required to make $57 million of payments to Con Edison Gas Pipeline and Storage Northeast, LLC because certain performance targets on growth capital projects were not achieved by December 31, 2020. As a result, our consolidated balance sheets reflect a $57 million liability related to the settlement of this obligation, of which $19 million was classified as current at December 31, 2020.

Guarantee. CEQP issued a guarantee under which CEQP would be required to pay up to $10 million if Crestwood Permian fails to honor its obligations to Crestwood Permian Basin, a 50% equity investment of Crestwood Permian, in the event Crestwood Permian Basin fails to satisfy its obligations under its gas gathering agreement with a third party. We do not believe that it is probable that this guarantee will result in future losses based on our assessment of the nature of the guarantee, the financial condition of the guaranteed party and the period of time that the guarantee has been outstanding, and as a result, we have not recorded a liability related to this guarantee on our consolidated balance sheets at December 31, 2020 and 2019.

Risk Management

12 Months Ended

Dec. 31, 2020

Risk Management - Notional Amounts and Terms of Companys Derivative Financial Instruments [Abstract]

Risk Management

We are exposed to certain market risks related to our ongoing business operations. These risks include exposure to changing commodity prices. We utilize derivative instruments to manage our exposure to fluctuations in commodity prices, which is discussed below. Additional information related to our derivatives is discussed in Note 2 and Note 8.

Risk Management Activities

We sell NGLs (such as propane, ethane, butane and heating oil), crude oil and natural gas to energy-related businesses and may use a variety of financial and other instruments including forward contracts involving physical delivery of NGLs, crude oil and natural gas. We periodically enter into offsetting positions to economically hedge against the exposure our customer contracts create. Certain of these contracts and positions are derivative instruments. We do not designate any of our commodity-based derivatives as hedging instruments for accounting purposes. Our commodity-based derivatives are reflected at fair value in our consolidated balance sheets, and changes in the fair value of these derivatives that impact our consolidated statements of operations are reflected in costs of product/services sold. Our commodity-based derivatives that are settled with physical commodities are reflected as an increase to product revenues, and the commodity inventory that is utilized to satisfy those physical obligations is reflected as an increase to costs of product sold in our consolidated statements of operations. The following table summarizes the impact to our consolidated statements of operations related to our commodity-based derivatives reflected in operating revenues and costs of product/services sold during the years ended December 31, 2020, 2019 and 2018 (in millions):


	December 31,
	2020		2019		2018
Product revenues	$	214.3	$	252.3	$	343.3
Gain (loss) reflected in costs of product/services sold	$	(20.7)	$	19.5	$	29.6

We attempt to balance our contractual portfolio in terms of notional amounts and timing of performance and delivery obligations. This balance in the contractual portfolio significantly reduces the volatility in costs of product/services sold related to these instruments.

Notional Amounts and Terms

The notional amounts of our derivative financial instruments include the following:


	December 31, 2020		December 31, 2019
	Fixed Price Payor	Fixed Price Receiver	Fixed Price Payor	Fixed Price Receiver
Propane, ethane, butane, heating oil and crude oil (MMBbls)	72.7	76.5	33.5	36.6
Natural gas (Bcf)	22.6	28.6	3.7	8.7

Notional amounts reflect the volume of transactions, but do not represent the amounts exchanged by the parties to the financial instruments. Accordingly, notional amounts do not reflect our monetary exposure to market or credit risks. All contracts subject to price risk had a maturity of 36 months or less; however, 86% of the contracted volumes will be delivered or settled within 12 months.

Credit Risk

Certain of our derivative instruments have credit limits that require us to post collateral. The amount of collateral required to be posted is a function of the net liability position of the derivative as well as our established credit limit with the respective counterparty. If our credit rating were to change, the counterparties could require us to post additional collateral. The amount of additional collateral that would be required to be posted would vary depending on the extent of change in our credit rating as well as the requirements of the individual counterparty. In addition, we have margin requirements with a New York Mercantile Exchange (NYMEX) broker related to our net asset or liability position with such broker. All collateral amounts have been netted against the asset or liability with the respective counterparty and are reflected in our consolidated balance sheets as assets and liabilities from price risk management activities.

The following table presents the fair value of our commodity derivative instruments with credit-risk-related contingent features and their associated collateral (in millions):


	December 31,
	2020		2019
Aggregate fair value of derivative instruments with credit-risk-related contingent features(1)	$	38.5	$	1.6
NYMEX-related net derivative asset (liability) position	$	35.9	$	(28.8)
NYMEX-related cash collateral (received) posted	$	(18.3)	$	40.4
Cash collateral received, net	$	12.4	$	16.9

(1) At December 31, 2020 and 2019, we posted less than $0.1 million of collateral associated with these derivatives.

Fair Value Measurements

12 Months Ended

Dec. 31, 2020

Fair Value Disclosures [Abstract]

Fair Value Measurements

The accounting standard for fair value measurement establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to unobservable inputs (Level 3 measurement). The three levels of the fair value hierarchy are as follows:

•Level 1—Quoted prices are available in active markets for identical assets or liabilities as of the reporting date. Active markets are those in which transactions for the asset or liability occur in sufficient frequency and volume to provide pricing information on an ongoing basis. Level 1 primarily consists of financial instruments such as exchange-traded derivatives, listed equities and US government treasury securities.

•Level 2—Pricing inputs are other than quoted prices in active markets included in Level 1, which are either directly or indirectly observable as of the reporting date. Level 2 includes those financial instruments that are valued using models or other valuation methodologies. These models are primarily industry-standard models that consider various assumptions, including quoted forward prices for commodities, time value, volatility factors, and current market and contractual prices for the underlying instruments, as well as other relevant economic measures. Substantially all of these assumptions are observable in the marketplace throughout the full term of the instrument, can be derived from observable data or are supported by observable levels at which transactions are executed in the marketplace. Instruments in this category include non-exchange-traded derivatives such as over the counter (OTC) forwards, options and physical exchanges.

•Level 3—Pricing inputs include significant inputs that are generally less observable from objective sources. These inputs may be used with internally developed methodologies that result in management’s best estimate of fair value.

Financial Assets and Liabilities

As of December 31, 2020 and 2019, we held certain assets and liabilities that are required to be measured at fair value on a recurring basis, which include our derivative instruments related to heating oil, crude oil, NGLs and natural gas. Our derivative instruments consist of forwards, swaps, futures, physical exchanges and options.

Our derivative instruments that are traded on the NYMEX have been categorized as Level 1.

Our derivative instruments also include OTC contracts, which are not traded on a public exchange. The fair values of these derivative instruments are determined based on inputs that are readily available in public markets or can be derived from information available in publicly quoted markets. These instruments have been categorized as Level 2.

Our OTC options are valued based on the Black Scholes option pricing model that considers time value and volatility of the underlying commodity. The inputs utilized in the model are based on publicly available information as well as broker quotes. These options have been categorized as Level 2.

Our financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. The assessment of the significance of a particular input to the fair value measurement requires judgment, and may affect the valuation of fair value assets and liabilities and their placement within the fair value hierarchy levels.

The following tables set forth by level within the fair value hierarchy, our financial instruments that were accounted for at fair value on a recurring basis at December 31, 2020 and 2019 (in millions):


	December 31, 2020
	Level 1		Level 2		Level 3		Gross Fair Value		Contract Netting(1)		Collateral/Margin Received or Paid		Fair Value
Assets
Assets from price risk management	$	20.2	$	480.5	$	—	$	500.7	$	(455.0)	$	(18.5)	$	27.2
Suburban Propane Partners, L.P. units(2)	2.1		—		—		2.1		—		—		2.1
Total assets at fair value	$	22.3	$	480.5	$	—	$	502.8	$	(455.0)	$	(18.5)	$	29.3

Liabilities
Liabilities from price risk management	$	25.1	$	494.0	$	—	$	519.1	$	(455.0)	$	12.2	$	76.3

Total liabilities at fair value	$	25.1	$	494.0	$	—	$	519.1	$	(455.0)	$	12.2	$	76.3

	December 31, 2019
	Level 1		Level 2		Level 3		Gross Fair Value		Contract Netting(1)		Collateral/Margin Received or Paid		Fair Value
Assets
Assets from price risk management	$	3.7	$	164.0	$	—	$	167.7	$	(122.3)	$	(2.2)	$	43.2
Suburban Propane Partners, L.P. units(2)	3.1		—		—		3.1		—		—		3.1
Total assets at fair value	$	6.8	$	164.0	$	—	$	170.8	$	(122.3)	$	(2.2)	$	46.3

Liabilities
Liabilities from price risk management	$	2.8	$	151.9	$	—	$	154.7	$	(122.3)	$	(25.7)	$	6.7
Total liabilities at fair value	$	2.8	$	151.9	$	—	$	154.7	$	(122.3)	$	(25.7)	$	6.7

(1)Amounts represent the impact of legally enforceable master netting agreements that allow us to settle positive and negative positions.

(2)Amount is reflected in other assets on CEQP’s consolidated balance sheets. The $1.0 million decrease in fair value of these units for the year ended December 31, 2020 is reflected in other income (expense), net on our consolidated statements of operations.

Long-Term Debt

12 Months Ended

Dec. 31, 2020

Text Block [Abstract]

Long-Term Debt

Long-term debt consisted of the following at December 31, 2020 and 2019, (in millions):


	December 31,
	2020		2019
Credit Facility	$	719.0	$	557.0
2023 Senior Notes	687.2		700.0
2025 Senior Notes	500.0		500.0
2027 Senior Notes	600.0		600.0
Other(1)	0.4		0.6
Less: deferred financing costs, net	22.6		29.1
Total debt	2,484.0		2,328.5
Less: current portion	0.2		0.2
Total long-term debt, less current portion	$	2,483.8	$	2,328.3

(1)Represents non-interest bearing obligations related to certain companies acquired in 2014 with payments due through 2022.

Credit Facility

Crestwood Midstream’s five-year $1.25 billion revolving credit facility (the CMLP Credit Facility) expires in October 2023 and is available to fund acquisitions, working capital and internal growth projects and for general partnership purposes. The CMLP Credit Facility allows Crestwood Midstream to increase its available borrowings under the facility by $350.0 million, subject to lender approval and the satisfaction of certain other conditions, as described in the credit agreement. The CMLP Credit Facility also includes a sub-limit of up to $25.0 million for same-day swing line advances and a sub-limit up to $350.0 million for letters of credit. Subject to limited exception, the CMLP Credit Facility is guaranteed and secured by substantially all of the equity interests and assets of Crestwood Midstream’s subsidiaries, except for Crestwood Infrastructure, Crestwood Niobrara, Crestwood Pipeline and Storage Northeast LLC (our wholly-owned subsidiary which owns a 50% equity interest in Stagecoach Gas), PRBIC and Tres Holdings and their respective subsidiaries. The Company also guarantees Crestwood Midstream’s payment obligations under its $1.25 billion credit agreement.

In April 2019, Crestwood Niobrara acquired the remaining 50% equity interest in Jackalope and funded approximately $250 million of the total purchase price through borrowings under Crestwood Midstream’s credit facility. Contemporaneously with the acquisition of the remaining interest in Jackalope, Crestwood Midstream entered into the First Amendment to the CMLP Credit Agreement to modify certain defined terms and calculations, among other things, to account for the Jackalope Acquisition. The CMLP Credit Facility contains various covenants and restrictive provisions that limit our ability to, among other things, (i) incur additional debt; (ii) make distributions on or redeem or repurchase units; (iii) make certain investments and acquisitions; (iv) incur or permit certain liens to exist; (v) merge, consolidate or amalgamate with another company; (vi) transfer or dispose of assets; and (vii) incur a change in control at either Crestwood Equity or Crestwood Midstream, including an acquisition of Crestwood Holdings’ ownership of Crestwood Equity’s general partner by any third party, including

Crestwood Holdings’ debtors under an event of default of their debt since Crestwood Equity’s non-economic general partner interest is pledged as collateral under that debt.

Borrowings under the CMLP Credit Facility (other than the swing line loans) bear interest at either:

•the Alternate Base Rate, which is defined as the highest of (i) the federal funds rate plus 0.50%; (ii) Wells Fargo Bank’s prime rate; or (iii) the Eurodollar Rate adjusted for certain reserve requirements plus 1%; plus a margin varying from 0.50% to 1.50% at December 31, 2020 depending on Crestwood Midstream’s most recent consolidated total leverage ratio; or

•the Eurodollar Rate, adjusted for certain reserve requirements plus a margin varying from 1.50% to 2.50% at December 31, 2020 depending on Crestwood Midstream’s most recent consolidated total leverage ratio.

Swing line loans bear interest at the Alternate Base Rate as described above. The unused portion of the CMLP Credit Facility is subject to a commitment fee ranging from 0.25% to 0.45% according to its most recent consolidated total leverage ratio. Interest on the Alternate Base Rate loans is payable quarterly, or if the adjusted Eurodollar Rate applies, interest is payable at certain intervals selected by Crestwood Midstream.

Crestwood Midstream is required under its credit agreement to maintain a net debt to consolidated EBITDA ratio (as defined in its credit agreement) of not more than 5.50 to 1.0, a consolidated EBITDA to consolidated interest expense ratio (as defined in its credit agreement) of not less than 2.50 to 1.0, and a senior secured leverage ratio (as defined in its credit agreement) of not more than 3.75 to 1.0. At December 31, 2020, the net debt to consolidated EBITDA was approximately 4.02 to 1.0, the consolidated EBITDA to consolidated interest expense was approximately 4.77 to 1.0, and the senior secured leverage ratio was 1.15 to 1.0.

At December 31, 2020, Crestwood Midstream had $507.1 million of available capacity under its credit facility considering the most restrictive covenants in its credit agreement. At December 31, 2020 and 2019, Crestwood Midstream’s outstanding standby letters of credit were $23.9 million and $31.7 million. Borrowings under the credit facility accrue interest at prime or Eurodollar based rates plus applicable spreads, which resulted in interest rates between 2.40% and 4.50% at December 31, 2020 and 3.96% and 6.00% at December 31, 2019. The weighted-average interest rates on outstanding borrowings as of December 31, 2020 and 2019 was 2.45% and 4.00%.

If Crestwood Midstream fails to perform its obligations under these and other covenants, the lenders’ credit commitment could be terminated and any outstanding borrowings, together with accrued interest, under the CMLP Credit Facility could be declared immediately due and payable. The CMLP Credit Facility also has cross default provisions that apply to any of its other material indebtedness.

Senior Notes

2023 Senior Notes. The 6.25% Senior Notes due 2023 (the 2023 Senior Notes) mature on April 1, 2023, and interest is payable semi-annually in arrears on April 1 and October 1 of each year.

2025 Senior Notes. The 5.75% Senior Notes due 2025 (the 2025 Senior Notes) mature on April 1, 2025, and interest is payable semi-annually in arrears on April 1 and October 1 of each year.

2027 Senior Notes. In April 2019, Crestwood Midstream issued $600 million of 5.625% unsecured senior notes due 2027 (the 2027 Senior Notes). The 2027 Senior Notes mature on May 1, 2027, and interest is payable semi-annually in arrears on May 1 and November 1 of each year, beginning November 1, 2019. The net proceeds from this offering of approximately $591.1 million were used to fund the acquisition of the remaining 50% equity interest in Jackalope.

2029 Senior Notes. In January 2021, Crestwood Midstream issued $700 million of 6.00% unsecured senior notes due 2029 (the 2029 Senior Notes). The 2029 Senior Notes will mature on February 1, 2029, and interest is payable semiannually in arrears on February 1 and August 1 of each year, beginning on August 1, 2021.

In general, each series of Crestwood Midstream’s senior notes are fully and unconditionally guaranteed, joint and severally, on a senior unsecured basis by Crestwood Midstream’s domestic restricted subsidiaries (other than Crestwood Midstream Finance Corp., which has no assets). The indentures contain customary release provisions, such as (i) disposition of all or substantially all the assets of, or the capital stock of, a guarantor subsidiary to a third person if the disposition complies with the indentures;

(ii) designation of a guarantor subsidiary as an unrestricted subsidiary in accordance with its indentures; (iii) legal or covenant defeasance of a series of senior notes, or satisfaction and discharge of the related indenture; and (iv) guarantor subsidiary ceases to guarantee any other indebtedness of Crestwood Midstream or any other guarantor subsidiary, provided it no longer guarantees indebtedness under the CMLP Credit Facility.

The indentures restrict the ability of Crestwood Midstream and its restricted subsidiaries to, among other things, sell assets; redeem or repurchase subordinated debt; make investments; incur or guarantee additional indebtedness or issue preferred units; create or incur certain liens; enter into agreements that restrict distributions or other payments to Crestwood Midstream from its restricted subsidiaries; consolidate, merge or transfer all or substantially all of their assets; engage in affiliate transactions; create unrestricted subsidiaries; and incur a change in control at either Crestwood Equity or Crestwood Midstream, including an acquisition of Crestwood Holdings’ ownership of Crestwood Equity’s general partner by any third party including Crestwood Holdings’ debtors under an event of default of their debt since Crestwood Equity’s non-economic general partner interest is pledged as collateral under that debt. These restrictions are subject to a number of exceptions and qualifications, and many of these restrictions will terminate when the senior notes are rated investment grade by either Moody’s Investors Service, Inc. or Standard & Poor’s Rating Services and no default or event of default (each as defined in the respective indentures) under the indentures has occurred and is continuing.

At December 31, 2020, Crestwood Midstream was in compliance with the debt covenants and restrictions in each of its credit agreements discussed above.

The CMLP Credit Facility and senior notes are secured by the net assets of its guarantor subsidiaries. Accordingly, such assets are only available to the creditors of Crestwood Midstream. Crestwood Equity had restricted net assets of approximately $1,805.1 million as of December 31, 2020.

Senior Notes Repayments. During the year ended December 31, 2020, Crestwood Midstream paid approximately $12.6 million to repurchase and cancel approximately $12.8 million of its 2023 Senior Notes. In January 2021, Crestwood Midstream issued $700 million of 6.00% unsecured senior notes due 2029, and utilized the proceeds to repurchase and cancel approximately $399.2 million of its 2023 Senior Notes and to repay indebtedness under its credit facility.

Maturities

The aggregate maturities of principal amounts on our outstanding long-term debt as of December 31, 2020 for the next five years and in total thereafter are as follows (in millions):


2021	$	0.2
2022	0.2
2023	1,406.2
2024	—
2025	500.0
Thereafter	600.0
Total debt	$	2,506.6

Commitments and Contingencies

12 Months Ended

Dec. 31, 2020

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Legal Proceedings

Linde Lawsuit. On December 23, 2019, Linde Engineering North America Inc. (Linde) filed a lawsuit in the District Court of Harris County, Texas alleging that Arrow Field Services, LLC, our consolidated subsidiary, and Crestwood Midstream breached a contract entered into in March 2018 under which Linde was to provide engineering, procurement and construction services to us related to the completion of the construction of the Bear Den II cryogenic processing plant. Linde claims damages of $55 million in unpaid invoices and other damages. This matter is not an insurable event based on our insurance policies, and we are unable to predict the outcome for this matter.

General. We are periodically involved in litigation proceedings. If we determine that a negative outcome is probable and the amount of loss is reasonably estimable, then we accrue the estimated amount. The results of litigation proceedings cannot be

predicted with certainty. We could incur judgments, enter into settlements or revise our expectations regarding the outcome of certain matters, and such developments could have a material adverse effect on our results of operations or cash flows in the period in which the amounts are paid and/or accrued. As of December 31, 2020 and 2019, we had approximately $10.4 million and $10.7 million accrued for outstanding legal matters. Based on currently available information, we believe it is remote that future costs related to known contingent liability exposures for which we can estimate will exceed current accruals by an amount that would have a material adverse impact on our consolidated financial statements. As we learn new facts concerning contingencies, we reassess our position both with respect to accrued liabilities and other potential exposures.

Any loss estimates are inherently subjective, based on currently available information, and are subject to management’s judgment and various assumptions. Due to the inherently subjective nature of these estimates and the uncertainty and unpredictability surrounding the outcome of legal proceedings, actual results may differ materially from any amounts that have been accrued.

Regulatory Compliance

In the ordinary course of our business, we are subject to various laws and regulations. In the opinion of our management, compliance with current laws and regulations will not have a material effect on our results of operations, cash flows or financial condition.

Environmental Compliance

Our operations are subject to stringent and complex laws and regulations pertaining to worker health, safety, and the environment. We are subject to laws and regulations at the federal, state, regional and local levels that relate to air and water quality, hazardous and solid waste management and disposal, and other environmental matters. The cost of planning, designing, constructing and operating our facilities must incorporate compliance with environmental laws and regulations and safety standards. Failure to comply with these laws and regulations may trigger a variety of administrative, civil and potentially criminal enforcement measures.

During 2014, 2015 and 2019, we experienced produced water releases on our Arrow water gathering system located on the Fort Berthold Indian Reservation in North Dakota. In August 2015, we received a Notice of Violation (2015 NOV) from the Three Affiliated Tribes’s Environmental Division related to the 2014 and 2015 water releases. In December 2020, we settled the 2015 NOV for approximately $2.3 million (including fines and penalties). In January 2021, we received a Notice of Violation and Opportunity to Confer from the EPA related to the 2019 water releases and we are currently conferring with the EPA. In all instances, we immediately notified the National Response Center, the Three Affiliated Tribes and numerous other regulatory authorities. We are also substantially complete with all remediation efforts at all release sites and continue to monitor any remaining impacts. We will continue our remediation efforts to ensure that lands impacted by the produced water releases are fully remediated. In response to the water releases, we removed several miles of gathering pipeline from the system that remained in service and replaced those sections with a pipeline composed of higher capacity material that is more suitable to the environment and climate conditions in the Bakken. The replaced pipeline increased water gathering capacity on the Arrow system and furthers our commitment to sustainability and environmental stewardship in the areas where we live and operate.

We believe these events are insurable under our policies, and our insurers have reimbursed us for certain of our remediation costs. We have not recorded an insurance receivable as of December 31, 2020.

At December 31, 2020 and 2019, our accrual of approximately $1.3 million and $6.7 million was based on our undiscounted estimate of amounts we will spend on compliance with environmental and other regulations, and any associated fines or penalties. We estimate that our potential liability for reasonably possible outcomes related to our environmental exposures could range from approximately $1.3 million to $2.1 million at December 31, 2020.

Self-Insurance

We utilize third-party insurance subject to varying retention levels of self-insurance, which management considers prudent. Such self-insurance relates to losses and liabilities primarily associated with medical claims, workers’ compensation claims and general, product, vehicle and environmental liability. Losses are accrued based upon management’s estimates of the aggregate liability for claims incurred using certain assumptions followed in the insurance industry and based on past experience. The primary assumption utilized is actuarially determined loss development factors. The loss development factors are based primarily on historical data. Our self insurance reserves could be affected if future claim developments differ from the historical trends. We believe changes in health care costs, trends in health care claims of our employee base, accident

frequency and severity and other factors could materially affect the estimate for these liabilities. We continually monitor changes in employee demographics, incident and claim type and evaluate our insurance accruals and adjust our accruals based on our evaluation of these qualitative data points. We are liable for the development of claims for our previously disposed of retail propane operations, provided they were reported prior to August 1, 2012. The following table summarizes CEQP’s and CMLP’s self-insurance reserves at December 31, 2020 and 2019 (in millions):


	CEQP				CMLP
	December 31,				December 31,
	2020		2019		2020		2019
Self-insurance reserves(1)	$	7.7	$	9.7	$	6.7	$	8.3

(1)At December 31, 2020, CEQP and CMLP classified approximately $4.8 million and $4.1 million, respectively of these reserves as other long-term liabilities on their consolidated balance sheets.

Purchase Commitments

We periodically enter into agreements with suppliers to purchase fixed quantities of NGLs, distillates, crude oil and natural gas at fixed prices. At December 31, 2020, the total of these firm purchase commitments was $1,598.8 million, of which approximately $1,398.2 million will occur over the next twelve months. We also enter into non-binding agreements with suppliers to purchase quantities of NGLs, distillates, crude oil and natural gas at variable prices at future dates at the then prevailing market prices.

We have entered into certain purchase commitments which totaled approximately $24.4 million at December 31, 2020. These purchase commitments primarily relate to future growth projects and maintenance obligations in our gathering and processing segment. The purchases associated with our commitments are expected to occur over the next twelve months.

Guarantees and Indemnifications

We are involved in various joint ventures that sometimes require financial and performance guarantees. In a financial guarantee, we are obligated to make payments if the guaranteed party fails to make payments under, or violates the terms of, the financial arrangement. In a performance guarantee, we provide assurance that the guaranteed party will execute on the terms of the contract. If they do not, we are required to perform on their behalf. We also periodically provide indemnification arrangements related to assets or businesses we have sold. For a further description of our guarantees associated with our joint ventures, see Note 6.

Our potential exposure under guarantee and indemnification arrangements can range from a specified amount to an unlimited dollar amount, depending on the nature of the claim, specificity as to duration, and the particular transaction. As of December 31, 2020, we have no amounts accrued for these guarantees.

Leases

12 Months Ended

Dec. 31, 2020

Leases [Abstract]

Lessee, Operating Leases

Leases

The following table summarizes the balance sheet information related to our operating and finance leases at December 31, 2020 and 2019 (in millions):


	December 31,
	2020		2019
Operating Leases
Operating lease right-of-use assets, net	$	36.8	$	53.8

Accrued expenses and other liabilities	$	14.7	$	18.1
Other long-term liabilities	28.5		41.5
Total operating lease liabilities	$	43.2	$	59.6
Finance Leases
Property, plant and equipment	$	13.3	$	14.9
Less: accumulated depreciation	7.9		5.4
Property, plant and equipment, net	$	5.4	$	9.5

Accrued expenses and other liabilities	$	2.9	$	3.2
Other long-term liabilities	1.9		5.2
Total finance lease liabilities	$	4.8	$	8.4

The following table presents the weighted-average remaining lease term and the weighted-average discount rate associated with our operating and finance leases as of December 31, 2020 and 2019:


	December 31,
	2020		2019
Weighted-average remaining lease term (in years):
Operating leases(1)	4.3		4.4
Finance leases(2)	1.7		2.6
Weighted-average discount rate:
Operating leases(3)	6.2	%	5.9	%
Finance leases(3)	7.3	%	7.3	%

(1) Remaining terms vary from one year to 19 years as of December 31, 2020.

(2) Remaining terms vary from one year to four years as of December 31, 2020.

(3) As of December 31, 2020 and 2019, we utilized discount rates ranging from 2.6% to 12.8% and 3.5% to 8.3%, respectively, to estimate the discounted cash flows used in estimating our right-of-use assets and lease liabilities, which were primarily based on our credit-adjusted collateralized incremental borrowing rate.

The estimation of our right-of-use assets and lease liabilities requires us to make significant assumptions and judgments about the terms of the leases, variable payments, and discount rates. Certain of our operating leases have renewal options to extend the leases from one year to 10 years at the end of each lease term, or terminate the leases at our sole discretion. In addition, certain of our finance leases have options to purchase the lease property by the end of the lease term. We make significant assumptions on the likelihood on whether we will renew our leases or purchase the property at the end of the lease terms in determining the discounted cash flows to measure our right-of-use assets and lease liabilities. The estimation of variable lease payments in determining discounted cash flows, including those with usage-based costs, also requires us to make significant assumptions on the timing and nature of the variability of those payments based on the lease terms.

We recognize operating lease expense and amortize our right-of-use assets for our finance leases on a straight-line basis over the term of the respective leases. We have applied the practical expedient of not separating the lease and non-lease components for our leases where the predominant consideration paid related to the underlying operating and finance lease contracts relate to the lease component. The following table presents the costs and sublease income associated with our operating and finance leases for the years ended December 31, 2020 and 2019 (in millions):


	Year Ended December 31,
	2020		2019
Operating leases:
Operating lease expense(1)(2)	$	27.2	$	28.3
Sublease income(3)	(1.7)		(1.0)
Total operating lease expense, net	$	25.5	$	27.3
Finance leases:
Amortization of right-of-use assets(4)	$	3.5	$	3.6
Interest on lease liabilities(5)	0.5		0.7
Total finance lease expense	$	4.0	$	4.3

(1)Approximately $17.6 million and $17.5 million is included in costs of product/services sold, $6.7 million and $8.0 million is included in operations and maintenance expense and $2.9 million and $2.8 million is included in general and administrative expense on our consolidated statements of operations for the years ended December 31, 2020 and 2019.

(2)Includes short-term and variable lease costs of approximately $5.5 million and $3.7 million for the years ended December 31, 2020 and 2019.

(3)Included in marketing, supply and logistics service revenues on our consolidated statements of operations.

(4)Included in depreciation, amortization and accretion expense on our consolidated statements of operations.

(5)Included in interest and debt expense, net on our consolidated statements of operations.

The following table presents supplemental cash flow information for our operating and finance leases for the years ended December 31, 2020 and 2019 (in millions):


	Year Ended December 31,
	2020		2019
Cash paid for lease liabilities:
Operating cash flows from operating leases	$	21.3	$	22.9
Operating cash flows from finance leases	$	0.5	$	0.7
Financing cash flows from finance leases	$	3.1	$	3.5
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$	2.1	$	4.2
Finance leases	$	0.4	$	1.8

The following table presents the future minimum lease liabilities under Topic 842 for our leases as of December 31, 2020 for the next five years and in total thereafter (in millions):


Year Ending December 31,	Operating Leases		Finance Leases		Total
2021	$	16.6	$	3.2	$	19.8
2022	11.3		1.8		13.1
2023	7.0		0.1		7.1
2024	6.3		—		6.3
2025	3.2		—		3.2
Thereafter	5.0		—		5.0
Total lease payments	49.4		5.1		54.5
Less: interest	6.2		0.3		6.5
Present value of lease liabilities	$	43.2	$	4.8	$	48.0

Partners' Capital and Non-Controlling Partner

12 Months Ended

Dec. 31, 2020

Partners' Capital [Abstract]

Partners' Capital

Partners’ Capital and Non-Controlling Partner

Preferred Units

Subject to certain conditions, the holders of the preferred units will have the right to convert preferred units into (i) common units on a 1-for-10 basis, or (ii) a number of common units determined pursuant to a conversion ratio set forth in Crestwood Equity’s partnership agreement upon the occurrence of certain events, such as a change in control. The preferred units have voting rights that are identical to the voting rights of the common units and will vote with the common units as a single class, with each preferred units entitled to one vote for each common unit into which such preferred unit is convertible, except that the preferred units are entitled to vote as a separate class on any matter on which all unitholders are entitled to vote that adversely affects the rights, powers, privileges or preferences of the preferred units in relation to CEQP’s other securities outstanding.

Subordinated Units

In conjunction with Crestwood Holdings’ acquisition of Crestwood Equity’s general partner, Crestwood Equity issued 438,789 subordinated units, which are considered limited partnership interests, and have the same rights and obligations as its common units, except that the subordinated units are entitled to receive distributions of available cash for a particular quarter only after each of our common units has received a distribution of at least $1.30 for that quarter. The subordinated units convert to common units after (i) CEQP’s common units have received a cumulative distribution in excess of $5.20 during a consecutive four quarter period; and (ii) its Adjusted Operating Surplus (as defined in the agreement) exceeds the distribution on a fully dilutive basis.

Distributions

Crestwood Equity

Limited Partners. Crestwood Equity makes quarterly distributions to its partners within approximately 45 days after the end of each quarter in an aggregate amount equal to its available cash for such quarter. Available cash generally means, with respect to each quarter, all cash on hand at the end of the quarter less the amount of cash that the general partner determines in its reasonable discretion is necessary or appropriate to:

•provide for the proper conduct of its business;

•comply with applicable law, any of its debt instruments, or other agreements; or

•provide funds for distributions to unitholders for any one or more of the next four quarters;

plus all cash on hand on the date of determination of available cash for the quarter resulting from working capital borrowings made after the end of the quarter. The amount of cash CEQP has available for distribution depends primarily upon its cash flow (which consists of the cash distributions it receives in connection with its ownership of Crestwood Midstream).

A summary of CEQP’s limited partner quarterly cash distributions for the years ended December 31, 2020, 2019 and 2018 is presented below:


Record Date	Payment Date	Per Unit Rate		Cash Distributions (in millions)
2020
February 7, 2020	February 14, 2020	$	0.625	$	45.3
May 8, 2020	May 15, 2020	$	0.625	45.7
August 7, 2020	August 14, 2020	$	0.625	45.7
November 6, 2020	November 13, 2020	$	0.625	46.0
				$	182.7
2019
February 7, 2019	February 14, 2019	$	0.60	$	43.1
May 8, 2019	May 15, 2019	$	0.60	43.1
August 7, 2019	August 14, 2019	$	0.60	43.1
November 7, 2019	November 14, 2019	$	0.60	43.1
				$	172.4
2018
February 7, 2018	February 14, 2018	$	0.60	$	42.7
May 8, 2018	May 15, 2018	$	0.60	42.7
August 7, 2018	August 14, 2018	$	0.60	42.7
November 7, 2018	November 14, 2018	$	0.60	42.7
				$	170.8

On February 12, 2021, we paid a distribution of $0.625 per limited partner unit to unitholders of record on February 5, 2021 with respect to the fourth quarter of 2020.

Preferred Unitholders. The holders of our preferred units are entitled to receive fixed quarterly distributions of $0.2111 per unit. Distributions on the preferred units are paid in cash unless, subject to certain exceptions, (i) there is no distribution being paid on our common units; and (ii) our available cash (as defined in our partnership agreement) is insufficient to make a cash distribution to our preferred unitholders. If we fail to pay the full amount payable to our preferred unitholders in cash, then (x) the fixed quarterly distribution on the preferred units will increase to $0.2567 per unit, and (y) we will not be permitted to declare or make any distributions to our common unitholders until such time as all accrued and unpaid distributions on the preferred units have been paid in full in cash. In addition, if we fail to pay in full any preferred distribution (as defined in our partnership agreement), the amount of such unpaid distribution will accrue and accumulate from the last day of the quarter for which such distribution is due until paid in full, and any accrued and unpaid distributions will be increased at a rate of 2.8125% per quarter.

During each of the years ended December 31, 2020, 2019 and 2018, we made cash distributions to our preferred unitholders of approximately $60.1 million. On February 12, 2021, we made a cash distribution of approximately $15.0 million to our preferred unitholders for the quarter ended December 31, 2020.

Crestwood Midstream

In accordance with the partnership agreement, Crestwood Midstream’s general partner may, from time to time, cause Crestwood Midstream to make cash distributions at the sole discretion of the general partner. During the years ended December 31, 2020, 2019 and 2018, Crestwood Midstream made distributions of $242.6 million, $235.8 million and $238.4 million, which represented net amounts due to Crestwood Midstream related to cash advances to CEQP for its general corporate activities.

Non-Controlling Partner

Crestwood Niobrara issued $175 million of Series A-2 Preferred Interests to CN Jackalope Holdings LLC (Jackalope Holdings) in conjunction with its equity interest in Jackalope. In April 2019, Crestwood Niobrara issued $235 million in new Series A-3 Preferred Units (collectively with the Series A-2 Preferred Units defined as the Crestwood Niobrara Preferred Units) to Jackalope Holdings in conjunction with Crestwood Niobrara’s acquisition of the remaining 50% equity interest in Jackalope from Williams. In connection with the issuance of the Series A-3 Preferred Units, we entered into a Third Amended and Restated Limited Liability Company Agreement (Crestwood Niobrara Amended Agreement) with Jackalope Holdings, pursuant to which we serve as managing member of Crestwood Niobrara. The Crestwood Niobrara Amended Agreement modified certain provisions under the previous limited liability company agreement related to the conversion and redemption of the Series A-2 Preferred Units, as follows:

•The Crestwood Niobrara Preferred Units are convertible by the preferred interest holder starting on January 1, 2021 into Crestwood Niobrara common units. The preferred interest holder has the option to contribute additional capital to Crestwood Niobrara to increase their common ownership percentage in Crestwood Niobrara to 50% upon the conversion.

•The Crestwood Niobrara Preferred Units are redeemable by the preferred interest holder starting on December 31, 2023 for an amount equal to the Liquidation Preference (as defined in the Crestwood Niobrara Amended Agreement). If redemption is elected by the preferred interest holder, we have the option to elect to give consideration equal to the Liquidation Preference in either (i) unregistered CEQP common units (subject to a Registration Rights Agreement) with a total value of up to $100 million and/or cash; or (ii) proceeds from a full liquidation of Crestwood Niobrara’s assets and unregistered CEQP common units (subject to a Registration Rights Agreement).

•The Crestwood Niobrara Preferred Units are redeemable by us starting on January 1, 2023 for either (i) unregistered CEQP common units (subject to a Registration Rights Agreement) with a total value of up to $100 million and/or cash; or (ii) proceeds from a full liquidation of Crestwood Niobrara’s assets and registered CEQP common units (subject to a Registration Rights Agreement).

As a result of the modification of the conversion and redemption provisions of the Crestwood Niobrara Preferred Units, we continue to consolidate Crestwood Niobrara and have reflected the preferred interests as a non-controlling interest in subsidiary apart from partners’ capital (i.e., temporary equity) on our consolidated balance sheets at December 31, 2020 and 2019. We adjust the carrying amount of the non-controlling interest to its redemption value each period through net income attributable to non-controlling partner.

The following table shows the change in the interest of our non-controlling partner in subsidiary at December 31, 2020 and 2019 (in millions):


Balance at December 31, 2018	$	—
Reclassification of Series A-2 Preferred Units	178.8
Issuance of Series A-3 Preferred Units	235.0
Distributions to non-controlling partner	(18.4)
Net income attributable to non-controlling partner	30.8
Balance at December 31, 2019	426.2
Contributions from non-controlling partner	2.8
Distributions to non-controlling partner	(37.1)
Net income attributable to non-controlling partner	40.8
Balance at December 31, 2020	$	432.7

Crestwood Niobrara is required to make quarterly cash distributions on its preferred interests within 30 days after the end of each quarter. During the years ended December 31, 2020, 2019 and 2018, Crestwood Niobrara paid cash distributions of $37.1 million, $25.0 million and $9.9 million to Jackalope Holdings. In January 2021, Crestwood Niobrara paid a cash distribution of $9.3 million to Jackalope Holdings for the quarter ended December 31, 2020.

Equity Plans

12 Months Ended

Dec. 31, 2020

Equity [Abstract]

Equity Plan

Equity Plans

Long-term incentive awards are granted under the Crestwood LTIP in order to align the economic interests of key employees and directors with those of CEQP’s common unitholders and to provide an incentive for continuous employment. Long-term incentive compensation consist of grants of restricted, phantom and performance units which vest based upon continued service.

As of December 31, 2020 and 2019, we had total unamortized compensation expense of approximately $29.7 million and $34.6 million related to restricted, phantom, and performance units, which will be amortized during the next three years (or sooner in certain cases, which generally represents the original vesting period of these instruments), except for grants to non-employee directors of our general partner, which vest over one year. We recognized compensation expense of approximately $35.1 million, $45.1 million and $24.3 million under the Crestwood LTIP during the years ended December 31, 2020, 2019 and 2018, which is included in general and administrative expenses on our consolidated statements of operations. During the years ended December 31, 2020 and 2019, compensation expense includes approximately $1.4 million and $4.6 million related to equity awards under the Crestwood LTIP that was included in accrued expenses and other liabilities on our consolidated balance sheet. As of February 12, 2021, we had 1,230,527 units available for issuance under the Crestwood LTIP.

Restricted Units. The Crestwood LTIP permits grants of restricted units that are designed to provide an incentive for continuous employment to certain key employees. Restricted units vest over a three-year period following the grant date or, if earlier, upon change of control of Crestwood Equity’s general partner or due to death or disability of the employee.

Phantom Units. The Crestwood LTIP permits grants of phantom units that entitle the holder to receive upon vesting one CEQP common unit pursuant to the Crestwood LTIP and the Crestwood Equity Phantom Unit Agreement. The Crestwood Equity Phantom Unit Agreement provides for vesting to occur at the end of three years following the grant date or, if earlier, upon the named executive officer’s termination without cause or due to death or disability or the named executive officer’s resignation for employee cause (each, as defined in the Crestwood Equity Phantom Unit Agreement). In addition, the Crestwood Equity Phantom Unit Agreement provides for distribution equivalent rights with respect to each phantom unit which are paid in additional phantom units and settled in common units upon vesting of the underlying phantom units.

Performance Units. The Crestwood LTIP permits grants of performance units that are designed to provide an incentive for continuous employment to certain key employees. Performance units vest over a three-year performance period and the number of units issued are based on a performance multiplier ranging between 50% and 200%, determined based on the actual performance in the third year of the performance period compared to pre-established performance goals. The performance goals are based on achieving a specified level of distributable cash flow per unit, Adjusted EBITDA, return on capital invested, and three-year relative total shareholder return. The vesting of performance units is subject to the attainment of certain performance and market goals over a three-year period and entitle a participant to receive common units of Crestwood Equity without payment of an exercise price upon vesting.

The following table summarizes information regarding restricted, phantom and performance unit activity during the years ended December 31, 2020, 2019 and 2018.


	Units	Weighted-Average Grant Date Fair Value
Unvested - January 1, 2018	1,830,096	$	25.21
Granted - restricted units	1,144,017	$	25.80
Granted - phantom units	7,750	$	26.10
Granted - performance units	901	$	25.60
Vested - restricted units	(617,807)	$	23.73
Vested - phantom units	(105,809)	$	49.45
Vested - performance units	(11,772)	$	28.87
Forfeited - restricted units	(53,530)	$	23.36
Forfeited - phantom units	(6)	$	49.45
Forfeited - performance units	(5,870)	$	30.45
Unvested - December 31, 2018	2,187,970	$	24.78
Granted - restricted units	988,096	$	31.48
Granted - phantom units	7,164	$	29.03
Granted - performance units	238,263	$	34.21
Vested - restricted units	(985,751)	$	23.39

Vested - performance units	(32,246)	$	34.21
Forfeited - restricted units	(47,547)	$	27.85


Unvested - December 31, 2019	2,355,949	$	28.94
Granted - restricted units	1,569,451	$	25.42
Granted - phantom units	17,726	$	28.48
Granted - performance units	715,674	$	28.46
Vested - restricted units	(906,275)	$	28.75
Vested - phantom units	(2,118)	$	26.63
Vested - performance units	(846,306)	$	29.85
Forfeited - restricted units	(149,001)	$	28.24
Forfeited - phantom units	(14,157)	$	27.91
Forfeited - performance units	(17,087)	$	27.35
Unvested - December 31, 2020	2,723,856	$	26.62

Under the Crestwood LTIP, participants who have been granted restricted units and/or performance units may elect to have us withhold common units to satisfy minimum statutory tax withholding obligations arising in connection with the vesting of non-vested common units. Any such common units withheld are returned to the Crestwood LTIP on the applicable vesting dates, which correspond to the times at which income is recognized by the employee. When we withhold these common units, we are required to remit to the appropriate taxing authorities the fair value of the units withheld as of the vesting date. The number of units withheld is determined based on the closing price per common unit as reported on the NYSE on such dates. During the years ended December 31, 2020, 2019, and 2018, we withheld 581,608, 336,548 and 221,576 common units to satisfy employee tax withholding obligations for the restricted and performance units.

Employee Unit Purchase Plan

In August 2018, the board of directors of our general partner approved an employee unit purchase plan under which employees of the general partner may purchase our common units through payroll deductions up to a maximum of 10% of the employees’ eligible compensation, not to exceed $25,000 for any calendar year. Under the plan, we anticipate purchasing our common units on the open market for the benefit of participating employees based on their payroll deductions. In addition, we may match up to 10% of participating employees’ payroll deductions to purchase additional Crestwood common units for participating employees. The board of directors of our general partner authorized 1,500,000 common units (subject to

adjustment as provided in the employee unit purchase plan) to be available for purchase. During the years ended December 31, 2020 and 2019, 29,784 and 6,341 common units were purchased under the plan. There were no common units purchased under the employee unit purchase plan in 2018.

Earnings Per Limited Partner Unit

12 Months Ended

Dec. 31, 2020

Earnings Per Share [Abstract]

Earnings Per Limited Partner Unit

We calculate basic net income per limited partner unit using the two-class method. Our income (loss) is allocated to our common units and other participating securities (i.e.,subordinated units) based on the amount of dividends paid in the current period plus an allocation of the undistributed earnings or excess distributions over earnings to the extent that each security participates in income (loss) or excess distributions over income (loss). The dilutive effect of the stock-based compensation performance units is calculated using the treasury stock method which considers the impact to net income or loss attributable to Crestwood Equity Partners and limited partner units from the potential issuance of limited partner units. The dilutive effect of the Preferred units and Crestwood Niobrara preferred units are calculated using the if-converted method which assumes units are converted at the beginning of the period (beginning with their respective issuance date), and the resulting common units are included in the denominator of the diluted net income per common unit calculation for the period being presented. Distributions declared in the period and undeclared distributions that accumulated during the period are added back to the numerator for purposes of the if-converted calculation.

We exclude potentially dilutive securities from the determination of diluted earnings per unit (as well as their related income statement impacts) when their impact is anti-dilutive. The following table summarizes information regarding the weighted-average of common units excluded during the years ended December 31, 2020, 2019 and 2018 (in millions):


	Year Ended December 31,
	2020	2019	2018
Preferred units (1)	7.1	7.1	7.1
Crestwood Niobrara’s preferred units(1)	5.7	—	6.5
Subordinated units(2)	0.4	—	0.4
Stock-based compensation performance units(2)	0.1	—	0.4

(1)See Note 12 for additional information regarding the potential conversion of our preferred units and Crestwood Niobrara’s preferred units to common units.

(2)For a description of our subordinated and stock-based compensation performance units, see Note 12 and Note 13, respectively.

The following table shows net income (loss) and weighted-average limited partner units used in computing basic and diluted net income (loss) per limited partner unit for the years ended December 31, 2020, 2019 and 2018 (in millions, except per unit data):


	Year Ended December 31,
	2020		2019		2018
Common unitholders’ interest in net income (loss)	$	(116.2)	$	223.6	$	(9.3)


Dilutive effect of net income attributable to subordinated units	—		1.4		—
Diluted net income (loss)	$	(116.2)	$	225.0	$	(9.3)

Weighted-average limited partners’ units outstanding - basic	73.2		71.8		71.2
Dilutive effect of Crestwood Niobrara preferred units	—		4.3		—

Dilutive effect of subordinated units	—		0.4		—
Dilutive effect of stock-based compensation performance units	—		0.4		—
Weighted-average limited partners’ units outstanding - diluted	73.2		76.9		71.2

Net income (loss) per limited partner unit:
Basic	$	(1.59)	$	3.11	$	(0.13)
Diluted	$	(1.59)	$	2.93	$	(0.13)

Employee Benefit Plan	12 Months Ended
Employee Benefit Plan	Dec. 31, 2020
Postemployment Benefits [Abstract]
Employee Benefit Plans	Employee Benefit PlanA 401(k) plan is available to all of our employees after meeting certain requirements. The plan permits employees to make contributions of up to 90% of their salary, subject to statutory limits, which was $19,500 in 2020, $19,000 in 2019 and $18,500 in 2018. We match 100% of participants’ basic contributions up to 6% of eligible compensation. Employees may participate in the plans immediately and certain employees are not eligible for matching contributions until after a 90-day waiting period. During the years ended December 31, 2020, 2019 and 2018, aggregate matching contributions made by us were $4.2 million, $4.7 million and $4.6 million.

Segments

12 Months Ended

Dec. 31, 2020

Segment Reporting [Abstract]

Segments

Financial Information

We have three operating and reportable segments: (i) gathering and processing; (ii) storage and transportation; and (iii) marketing, supply and logistics. Our corporate operations include all general and administrative expenses that are not allocated to our reportable segments. For a further description of our operating and reporting segments, see Note 1. We assess the performance of our operating segments based on EBITDA, which is defined as income before income taxes, plus debt-related costs (net interest and debt expense and loss on modification/extinguishment of debt) and depreciation, amortization and accretion expense.

Below is a reconciliation of CEQP’s and CMLP’s net income (loss) to EBITDA (in millions):


	CEQP						CMLP
	Year Ended December 31,						Year Ended December 31,
	2020		2019		2018		2020		2019		2018
Net income (loss)	$	(15.3)	$	319.9	$	67.0	$	(23.4)	$	310.6	$	58.6
Add:
Interest and debt expense, net	133.6		115.4		99.2		133.6		115.4		99.2
(Gain) loss on modification/extinguishment of debt	(0.1)		—		0.9		(0.1)		—		0.9
Provision (benefit) for income taxes	0.4		0.3		0.1		(0.1)		0.3		—
Depreciation, amortization and accretion	237.4		195.8		168.7		251.5		209.9		181.4
EBITDA	$	356.0	$	631.4	$	335.9	$	361.5	$	636.2	$	340.1

The following tables summarize CEQP’s and CMLP’s reportable segment data for the years ended December 31, 2020, 2019 and 2018 (in millions). Intersegment revenues included in the following tables are accounted for as arms-length transactions that apply our revenue recognition policy described in Note 2. Included in earnings from unconsolidated affiliates below was approximately $42.9 million, $42.1 million and $42.3 million of our proportionate share of interest expense, depreciation and amortization expense and gains (losses) on long-lived assets, net recorded by our equity investments for the years ended December 31, 2020, 2019 and 2018, respectively.

Segment Information


	Year Ended December 31, 2020
	Gathering and Processing		Storage and Transportation		Marketing, Supply and Logistics		Corporate		Total
Crestwood Midstream
Revenues	$	631.4	$	13.8	$	1,609.1	$	—	$	2,254.3
Intersegment revenues	159.8		9.2		(169.0)		—		—
Costs of product/services sold	261.5		0.2		1,338.8		—		1,600.5
Operations and maintenance expense	84.9		3.6		43.3		—		131.8
General and administrative expense	—		—		—		86.7		86.7
Gain (loss) on long-lived assets, net	(23.8)		—		(2.4)		0.2		(26.0)
Goodwill impairment	(80.3)		—		—		—		(80.3)


Earnings (loss) from unconsolidated affiliates, net	(1.0)		33.5		—		—		32.5

Crestwood Midstream EBITDA	$	339.7	$	52.7	$	55.6	$	(86.5)	$	361.5
Crestwood Equity
General and administrative expense	—		—		—		4.8		4.8

Other expense	—		—		—		(0.7)		(0.7)
Crestwood Equity EBITDA	$	339.7	$	52.7	$	55.6	$	(92.0)	$	356.0


	Year Ended December 31, 2019
	Gathering and Processing		Storage and Transportation		Marketing, Supply and Logistics		Corporate		Total
Crestwood Midstream
Revenues	$	835.8	$	20.4	$	2,325.7	$	—	$	3,181.9
Intersegment revenues	175.0		14.2		(189.2)		—		—
Costs of product/services sold	526.1		0.2		2,018.6		—		2,544.9
Operations and maintenance expense	98.7		4.0		36.1		—		138.8
General and administrative expense	—		—		—		98.2		98.2
Gain (loss) on long-lived assets, net	(6.2)		—		(0.2)		0.2		(6.2)
Gain on acquisition	209.4		—		—		—		209.4


Earnings (loss) from unconsolidated affiliates, net	(2.1)		34.9		—		—		32.8
Other income, net	—		—		—		0.2		0.2
Crestwood Midstream EBITDA	$	587.1	$	65.3	$	81.6	$	(97.8)	$	636.2
Crestwood Equity
General and administrative expense	—		—		—		5.2		5.2

Other income	—		—		—		0.4		0.4
Crestwood Equity EBITDA	$	587.1	$	65.3	$	81.6	$	(102.6)	$	631.4


	Year Ended December 31, 2018
	Gathering and Processing		Storage and Transportation		Marketing, Supply and Logistics		Corporate		Total
Crestwood Midstream
Revenues	$	946.7	$	17.1	$	2,690.3	$	—	$	3,654.1
Intersegment revenues	192.4		10.5		(202.9)		—		—
Costs of product/services sold	767.0		0.2		2,362.2		—		3,129.4
Operations and maintenance expense	71.7		3.3		50.8		—		125.8
General and administrative expense	—		—		—		83.5		83.5
Gain (loss) on long-lived assets, net	(3.0)		—		(27.3)		1.7		(28.6)


Earnings from unconsolidated affiliates, net	22.5		30.8		—		—		53.3

Crestwood Midstream EBITDA	$	319.9	$	54.9	$	47.1	$	(81.8)	$	340.1
Crestwood Equity
General and administrative expense	—		—		—		4.6		4.6

Other income	—		—		—		0.4		0.4
Crestwood Equity EBITDA	$	319.9	$	54.9	$	47.1	$	(86.0)	$	335.9

Other Segment Information


	CEQP				CMLP
	Year Ended December 31,				Year Ended December 31,
	2020		2019		2020		2019
Total Assets
Gathering and Processing	$	3,464.6	$	3,715.3	$	3,609.7	$	3,874.7
Storage and Transportation	944.6		980.2		944.6		980.2
Marketing, Supply and Logistics	805.0		624.7		805.0		624.7
Corporate	29.5		29.1		26.2		24.4
Total Assets	$	5,243.7	$	5,349.3	$	5,385.5	$	5,504.0



	Year Ended December 31,
	2020		2019		2018
Purchases of property, plant and equipment (1)
Gathering and Processing	$	159.7	$	447.7	$	294.7
Storage and Transportation	0.4		0.1		0.6
Marketing, Supply and Logistics	7.1		5.8		5.6
Corporate	1.1		1.9		4.6
Total Purchases of property, plant and equipment	$	168.3	$	455.5	$	305.5

(1)Amounts represent both Crestwood Midstream and Crestwood Equity.

Major Customers

No customer accounted for 10% or more of our total consolidated revenues for the years ended December 31, 2020 and 2018 at CEQP or CMLP. For the year ended December 31, 2019, revenues from British Petroleum and its affiliates of approximately $333.9 million (reflected primarily in our Marketing, Supply and Logistics segment) accounted for approximately 10% of our total consolidated revenues at CEQP and CMLP.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8924-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8981-108599

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8721-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8721-108599

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-URI http://asc.fasb.org/topic&trid=2134510

+ Details

Revenues

12 Months Ended

Dec. 31, 2020

Revenue from Contract with Customer [Abstract]

Revenue from Contract with Customer [Text Block]

Revenues

Contract Assets and Contract Liabilities

Our contract assets and contract liabilities are reported in a net position on a contract-by-contract basis at the end of each reporting period. Our receivables related to our revenue contracts accounted for under Topic 606 totaled $219.9 million and $225.0 million for both CEQP and CMLP at December 31, 2020 and 2019, and are included in accounts receivable on our consolidated balance sheets. Our contract assets are included in other non-current assets on our consolidated balance sheets. Our contract liabilities primarily consist of current and non-current deferred revenues. On our consolidated balance sheets, our current deferred revenues are included in accrued expenses and other liabilities and our non-current deferred revenues are included in other long-term liabilities. The majority of revenues associated with our deferred revenues is expected to be recognized as the performance obligations under the related contracts are satisfied over the next 16 years.

The following table summarizes our contract assets and contract liabilities (in millions):


	December 31,
	2020		2019
Contract assets (non-current)	$	1.0	$	1.2
Contract liabilities (current)(1)	$	10.3	$	8.8
Contract liabilities (non-current)(1)	$	172.2	$	144.7

(1)During the year ended December 31, 2020, we recognized revenues of approximately $11.6 million that were previously included in contract liabilities at December 31, 2019. The remaining change in our contract liabilities during the year ended December 31, 2020 related to capital reimbursements associated with our revenue contracts and revenue deferrals associated with our contracts with increasing (decreasing) rates.

The following table summarizes the transaction price allocated to our remaining performance obligations under certain contracts that have not been recognized as of December 31, 2020 (in millions):


2021	$	94.2
2022	54.1
2023	8.0
2024	3.3


Total	$	159.6

Our remaining performance obligations presented in the table above exclude estimates of variable rate escalation clauses in our contracts with customers, and is generally limited to fixed-fee and percentage-of-proceeds service contracts which have fixed pricing and minimum volume terms and conditions. Our remaining performance obligations generally exclude, based on the following practical expedients that we elected to apply, disclosures for (i) variable consideration allocated to a wholly-unsatisfied promise to transfer a distinct service that forms part of the identified single performance obligation; (ii) unsatisfied performance obligations where the contract term is one year or less; and (iii) contracts for which we recognize revenues as amounts are invoiced.

Disaggregation of Revenues

The following tables summarize our revenues from contracts with customers disaggregated by type of product/service sold and by commodity type for each of our segments for the years ended December 31, 2020, 2019 and 2018 (in millions). We believe this summary best depicts how the nature, amount, timing and uncertainty of our revenues and cash flows are affected by economic factors. Our non-Topic 606 revenues presented in the tables below primarily represent revenues related to our commodity-based derivatives.


	Year Ended December 31, 2020
	Gathering and Processing		Storage and Transportation		Marketing, Supply and Logistics		Intersegment Elimination		Total
Revenues:
Topic 606 revenues
Gathering
Natural gas	$	140.6	$	—	$	—	$	—	$	140.6
Crude oil	95.3		—		—		—		95.3
Water	92.6		—		—		—		92.6
Processing
Natural gas	31.9		—		—		—		31.9

Compression
Natural gas	23.9		—		—		—		23.9
Storage
Crude oil	1.1		4.0		—		(2.4)		2.7
NGLs	—		—		13.1		—		13.1
Pipeline
Crude oil	—		6.1		—		(2.0)		4.1
NGLs	—		—		0.3		—		0.3
Transportation
Crude oil	6.2		—		1.9		(0.1)		8.0
NGLs	—		—		10.9		—		10.9

Rail Loading
Crude oil	—		11.8		—		(4.4)		7.4

Product Sales
Natural gas	53.4		—		90.9		(52.8)		91.5
Crude oil	292.2		—		660.7		(53.0)		899.9
NGLs	54.0		—		614.2		(53.6)		614.6
Other	—		1.1		1.1		(0.7)		1.5
Total Topic 606 revenues	791.2		23.0		1,393.1		(169.0)		2,038.3
Non-Topic 606 revenues	—		—		216.0		—		216.0
Total revenues	$	791.2	$	23.0	$	1,609.1	$	(169.0)	$	2,254.3


	Year Ended December 31, 2019
	Gathering and Processing		Storage and Transportation		Marketing, Supply and Logistics		Intersegment Elimination		Total
Revenues:
Topic 606 revenues
Gathering
Natural gas	$	163.2	$	—	$	—	$	—	$	163.2
Crude oil	75.0		—		—		—		75.0
Water	79.6		—		—		—		79.6
Processing
Natural gas	28.9		—		—		—		28.9

Compression
Natural gas	24.9		—		—		—		24.9
Storage
Crude oil	1.9		5.4		—		(2.3)		5.0
NGLs	—		—		6.3		—		6.3
Pipeline
Crude oil	—		7.9		—		(2.7)		5.2
Transportation
Crude oil	7.0		—		5.8		(0.1)		12.7
NGLs	—		—		11.7		—		11.7
Water	—		—		0.2		—		0.2
Rail Loading
Crude oil	—		16.7		—		(5.7)		11.0

Product Sales
Natural gas	56.8		—		72.3		(33.4)		95.7
Crude oil	532.1		—		1,315.6		(121.1)		1,726.6
NGLs	41.4		—		659.3		(20.0)		680.7
Other	—		4.6		1.2		(3.9)		1.9
Total Topic 606 revenues	1,010.8		34.6		2,072.4		(189.2)		2,928.6
Non-Topic 606 revenues	—		—		253.3		—		253.3
Total revenues	$	1,010.8	$	34.6	$	2,325.7	$	(189.2)	$	3,181.9


	Year Ended December 31, 2018
	Gathering and Processing		Storage and Transportation		Marketing, Supply and Logistics		Intersegment Elimination		Total
Revenues:
Topic 606 revenues
Gathering
Natural gas	$	134.9	$	—	$	—	$	—	$	134.9
Crude oil	38.8		—		—		—		38.8
Water	58.0		—		—		—		58.0
Processing
Natural gas	10.7		—		—		—		10.7
NGLs	—		—		6.1		—		6.1
Compression
Natural gas	29.1		—		—		—		29.1
Storage
Crude oil	1.8		4.2		—		(1.5)		4.5
NGLs	—		—		8.6		—		8.6
Pipeline
Crude oil	—		7.1		—		(2.3)		4.8
Transportation
Crude oil	2.9		—		5.9		—		8.8
NGLs	—		—		26.9		—		26.9
Water	—		—		0.3		—		0.3
Rail Loading
Crude oil	—		14.3		0.2		(5.2)		9.3
NGLs	—		—		3.1		—		3.1
Product Sales
Natural gas	55.8		—		70.9		(16.6)		110.1
Crude oil	722.9		—		978.0		(151.3)		1,549.6
NGLs	84.2		—		1,247.0		(24.5)		1,306.7
Other	—		2.0		—		(1.5)		0.5
Total Topic 606 revenues	1,139.1		27.6		2,347.0		(202.9)		3,310.8
Non-Topic 606 revenues	—		—		343.3		—		343.3
Total revenues	$	1,139.1	$	27.6	$	2,690.3	$	(202.9)	$	3,654.1

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-URI http://asc.fasb.org/topic&trid=49130388

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130550-203045

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130558-203045

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

+ Details

Income Taxes

12 Months Ended

Dec. 31, 2020

Income Tax Disclosure [Abstract]

Income Taxes

The (provision) benefit for income taxes for the years ended December 31, 2020, 2019, and 2018 consisted of the following (in millions):


	CEQP						CMLP
	Year Ended December 31,						Year Ended December 31,
	2020		2019		2018		2020		2019		2018
Current:
Federal	$	(0.2)	$	(0.1)	$	(0.5)	$	0.1	$	0.1	$	0.1
State	(0.1)		(0.2)		(0.3)		—		(0.2)		(0.2)
Total current	(0.3)		(0.3)		(0.8)		0.1		(0.1)		(0.1)
Deferred:
Federal	(0.1)		0.1		0.5		—		—		—
State	—		(0.1)		0.2		—		(0.2)		0.1
Total deferred	(0.1)		—		0.7		—		(0.2)		0.1
(Provision) benefit for income taxes	$	(0.4)	$	(0.3)	$	(0.1)	$	0.1	$	(0.3)	$	—

The effective rate differs from the statutory rate for the years ended December 31, 2020, 2019 and 2018, primarily due to the partnerships not being treated as a corporation for federal income tax purposes as discussed in Note 2.

Deferred income taxes related to the operations of CEQP’s wholly-owned taxable subsidiaries, IPCH Acquisition Corp. and Crestwood Gas Services GP LLC, and the impact of Texas Margin tax on our operations, and reflects the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes.

Components of our deferred income taxes at December 31, 2020 and 2019 are as follows (in millions).


	CEQP				CMLP
	December 31,				December 31,
	2020		2019		2020		2019


Total deferred tax asset(1)	$	0.2	$	0.2	$	—	$	—


Total deferred tax liability(1)	(2.9)		(2.8)		(0.7)		(0.7)
Net deferred tax liability	$	(2.7)	$	(2.6)	$	(0.7)	$	(0.7)

(1)Relates to the basis difference in the stock of a company.

Uncertain Tax Positions. We evaluate the uncertainty in tax positions taken or expected to be taken in the course of preparing our consolidated financial statements to determine whether the tax positions are more likely than not of being sustained by the applicable tax authority. Such tax positions, if any, would be recorded as a tax benefit or expense in the current year. We believe that there were no uncertain tax positions that would impact our results of operations for the years ended December 31, 2020, 2019 and 2018 and that no provision for income tax was required for these consolidated financial statements. However, our conclusions regarding the evaluation of uncertain tax positions are subject to review and may change based on factors including, but not limited to, ongoing analyses of tax laws, regulations and interpretations thereof.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References + Details

Related Party Transactions

12 Months Ended

Dec. 31, 2020

Related Party Transactions

Crestwood Holdings indirectly owns both CEQP’s and CMLP’s general partner. The affiliates of Crestwood Holdings and its owners are considered CEQP’s and CMLP’s related parties. We enter into transactions with our affiliates within the ordinary course of business, including gas gathering and processing services under long-term contracts, product purchases and sales, marketing and various operating agreements. We also enter into transactions with our affiliates related to services provided on our expansion projects. During the years ended December 31, 2020 and 2019, we paid approximately $3.5 million and $9.9 million of capital expenditures to Applied Consultants, Inc., an affiliate of Crestwood Holdings. Below is a discussion of certain of our related party agreements.

Shared Services. CMLP shares common management, general and administrative and overhead costs with CEQP, and as such, CMLP allocates a portion of its costs to CEQP. CEQP grants long-term incentive awards under the Crestwood LTIP as discussed in Note 13 and, as such, CEQP allocates certain of its unit-based compensation costs to CMLP.

Stagecoach Gas Management Agreement. Crestwood Midstream Operations, LLC (Crestwood Midstream Operations), our wholly-owned subsidiary and Stagecoach Gas entered into a management agreement under which Crestwood Midstream Operations provides the management and operating services required by Stagecoach Gas’s facilities. The initial term of the agreement will expire in May 2021, and is automatically extended for three-year periods unless otherwise terminated pursuant to the terms of the agreement. Reimbursements received from Stagecoach Gas under this agreement are reflected as a reduction of operations and maintenance expenses in our consolidated statements of operations.

Tres Holdings Operating Agreement. CMLP Tres Manager, LLC, a consolidated subsidiary of Crestwood Midstream, entered into an operating agreement with Tres Holdings, pursuant to which we operate and maintain their facilities as well as provide certain administrative and other general services identified in the agreement. Under the operating agreement, Tres Holdings reimburses us for all costs incurred on its behalf. These reimbursements are reflected as a reduction of operations and maintenance expenses in our consolidated statements of operations.

Crestwood Permian Operating Agreement. Crestwood Midstream Operations entered into an operating agreement with Crestwood Permian, pursuant to which we provide operating services for Crestwood Permian’s facilities, as well as certain

administrative and other general services identified in the agreement. Under this operating agreement, Crestwood Permian reimburses us for all costs incurred on its behalf. These reimbursements are reflected as a reduction of operations and maintenance expenses in our consolidated statements of operations.

Jackalope Marketing Services Agreement. On April 9, 2019, Crestwood Niobrara, our consolidated subsidiary, acquired Williams’s 50% equity interest in Jackalope, and as a result, Crestwood Niobrara controls and owns 100% of the equity interests in Jackalope. Prior to the acquisition of the remaining interest in Jackalope, Crestwood Niobrara entered into a marketing services agreement with Jackalope under which we provided marketing services for Jackalope as well as certain administrative and other general services identified in the agreement. Under this marketing services agreement, Jackalope reimbursed us for all costs incurred on its behalf. These reimbursements are reflected as a reduction of operations and maintenance expenses in our consolidated statements of operations.

The following table shows transactions with our affiliates which are reflected in our consolidated statements of operations for the years December 31, 2020, 2019 and 2018 (in millions):


	Year Ended December 31,
	2020		2019		2018
Revenues at CEQP and CMLP(1)	$	27.8	$	2.9	$	1.0
Costs of product/services sold at CEQP and CMLP(2)	$	21.0	$	45.4	$	134.7
Operations and maintenance expenses at CEQP and CMLP(3)	$	21.8	$	25.9	$	28.7
General and administrative expenses charged by CEQP to CMLP, net(4)	$	31.1	$	41.4	$	20.7
General and administrative expenses at CEQP charged to (from) Crestwood Holdings, net(5)	$	6.5	$	(0.6)	$	(2.7)

(1)Includes (i) $27.8 million, $1.0 million and $1.0 million during the year ended December 31, 2020, 2019 and 2018 related to the sale of NGLs to a subsidiary of Crestwood Permian; (ii) $1.2 million during the year end December 31, 2019 related to the sale of natural gas to a subsidiary of Stagecoach Gas: and (iii) $0.7 million during the year ended December 31, 2019 related to the sale of NGLs to our affiliate, Westlake Chemical Corporation.

(2)Includes (i) $20.0 million, $19.0 million and $56.1 million during the years ended December 31, 2020, 2019 and 2018 related to purchases of NGLs from a subsidiary of Crestwood Permian; (ii) $0.6 million during the year ended December 31, 2020 related to storage services provided by a subsidiary of Tres Holdings; (iii) $0.4 million, $23.9 million and $78.6 million during the years ended December 31, 2020, 2019 and 2018 related to an agency marketing agreement with Ascent Resources - Utica, LLC (Ascent); (iv) $0.2 million during the year ended December 31, 2019 related to purchases of NGLs from Blue Racer Midstream, LLC (Blue Racer); and (v) $2.3 million during the year ended December 31, 2019 related to purchases of natural gas from a subsidiary of Stagecoach Gas. Ascent and Blue Racer are affiliates of Crestwood Holdings for the respective periods presented.

(3)We have operating agreements with certain of our unconsolidated affiliates pursuant to which we charge them operations and maintenance expenses in accordance with their respective agreements described above. During the year ended December 31, 2020, we charged $6.6 million to Stagecoach Gas, $4.1 million to Tres Holdings and $11.1 million to Crestwood Permian. During the year ended December 31, 2019, we charged $7.5 million to Stagecoach Gas, $4.4 million to Tres Holdings, $13.5 million to Crestwood Permian and $0.5 million to Jackalope. During the year ended December 31, 2018, we charged $7.9 million to Stagecoach Gas, $3.8 million to Tres Holdings, $15.9 million to Crestwood Permian and $1.1 million to Jackalope.

(4)Includes $35.1 million, $45.1 million and $24.3 million of unit-based compensation charges allocated from CEQP to CMLP for the years ended December 31, 2020, 2019 and 2018. In addition, includes $4.0 million, $3.7 million and $3.6 million of CMLP’s general and administrative costs allocated to CEQP during the years ended December 31, 2020, 2019 and 2018.

(5)Includes a $4.4 million reduction of unit-based compensation charges allocated from Crestwood Holdings to CEQP and CMLP during the year ended December 31, 2020 and $1.9 million and $4.2 million of unit-based compensation charges allocated from Crestwood Holdings to CEQP and CMLP during the years ended December 31, 2019 and 2018. In addition, includes $2.1 million, $1.3 million and $1.5 million of CEQP’s general and administrative costs allocated to Crestwood Holdings during the years ended December 31, 2020, 2019 and 2018.

The following table shows accounts receivable and accounts payable from our affiliates as of December 31, 2020 and 2019 (in millions):


	December 31,
	2020		2019
Accounts receivable at CEQP and CMLP	$	2.5	$	7.3
Accounts payable at CEQP	$	7.5	$	15.6
Accounts payable at CMLP	$	5.0	$	13.1

Schedule I - Crestwood Equity Partners LP - Parent Only

12 Months Ended

Dec. 31, 2020

Condensed Financial Information Disclosure [Abstract]

Schedule I - Crestwood Equity Partners LP - Parent Only

Schedule I

Crestwood Equity Partners LP

Parent Only

Condensed Balance Sheets

(in millions)


	December 31,
	2020		2019
Assets
Current assets:
Cash	$	0.2	$	0.2



Total current assets	0.2		0.2

Property, plant and equipment, net	0.9		1.0

Investments in subsidiaries	1,655.7		1,935.9
Other assets	2.1		3.1
Total assets	$	1,658.9	$	1,940.2

Liabilities and partners’ capital
Current liabilities:
Accounts payable	$	0.1	$	0.1
Accrued expenses	1.9		1.3

Total current liabilities	2.0		1.4


Other long-term liabilities	1.5		6.0

Total partners’ capital	1,655.4		1,932.8
Total liabilities and partners’ capital	$	1,658.9	$	1,940.2

See accompanying notes.

Schedule I

Crestwood Equity Partners LP

Parent Only

Condensed Statements of Comprehensive Income

(in millions)


	Year Ended December 31,
	2020		2019		2018
Revenues	$	—	$	—	$	—
Expenses	4.9		5.3		6.1
Operating loss	(4.9)		(5.3)		(6.1)
Equity in net income (loss) of subsidiaries	(50.5)		290.0		56.5
Other income (expense), net	(0.7)		0.4		0.4



Net income (loss) attributable to Crestwood Equity Partners LP	(56.1)		285.1		50.8
Other comprehensive income (loss)
Change in fair value of Suburban Propane Partners, L.P. units	—		0.3		(0.7)
Comprehensive income (loss) attributable to Crestwood Equity Partners LP	$	(56.1)	$	285.4	$	50.1

See accompanying notes.

Schedule I

Crestwood Equity Partners LP

Parent Only

Condensed Statements of Cash Flows

(in millions)


	Year Ended December 31,
	2020		2019		2018
Cash flows from operating activities	$	(9.4)	$	(3.7)	$	(3.8)

Cash flows from investing activities	242.6		235.8		238.4

Cash flows from financing activities:



Distributions paid to partners	(242.8)		(232.5)		(230.9)

Change in intercompany balances	9.6		0.4		(3.8)

Net cash used in financing activities	(233.2)		(232.1)		(234.7)

Net change in cash	—		—		(0.1)
Cash at beginning of period	0.2		0.2		0.3
Cash at end of period	$	0.2	$	0.2	$	0.2

See accompanying notes.

Schedule I

Crestwood Equity Partners LP

Parent Only

Notes to Condensed Financial Statements

Note 1. Basis of Presentation

In the parent-only financial statements, our investment in subsidiaries is stated at cost plus equity in undistributed earnings of subsidiaries since the date of acquisition. Our share of net income of our unconsolidated subsidiaries is included in consolidated income using the equity method. The parent-only financial statements should be read in conjunction with our consolidated financial statements.

Note 2. Distributions

During the years ended December 31, 2020, 2019 and 2018, we received cash distributions from Crestwood Midstream Partners LP of approximately $242.6 million, $235.8 million and $238.4 million.

Schedule II - Crestwood Equity Parnters LP - Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2020

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

Schedule II - Crestwood Equity Partners LP - Valuation and Qualifying Accounts

Schedule II

Crestwood Equity Partners LP

Crestwood Midstream Partners LP

Valuation and Qualifying Accounts

For the Years Ended December 31, 2020, 2019 and 2018

(in millions)


	Balance at beginning of period		Charged to costs and expenses		Other Additions(1)		Deductions (write-offs)		Balance at end of period
Allowance for doubtful accounts
2020	$	0.3	$	0.5	$	0.7	$	(0.6)	$	0.9
2019	$	0.3	$	0.1	$	—	$	(0.1)	$	0.3
2018	$	2.4	$	0.2	$	—	$	(2.3)	$	0.3

Basis of Presentation and Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2020

Accounting Policies [Abstract]

Use of Estimates

Cash and Restricted Cash

Cash

We consider all highly liquid investments with an original maturity of less than three months to be cash.

Accounts Receivable

Inventory

InventoryOur inventory is stated at the lower of cost or net realizable value and cost is computed predominantly using the average cost method.

Property, Plant and Equipment


			Years
Gathering systems and pipelines			15 - 20
Facilities and equipment			3 - 25
Buildings, rights-of-way and easements			1 - 40
Office furniture and fixtures			5- 10
Vehicles			5

Identifiable Intangible Assets

Goodwill

Lessee, Leases

Leases

Investment in Unconsolidated Affiliate

Investments in Unconsolidated AffiliatesEquity method investments in which we exercise significant influence, but do not control and are not the primary beneficiary, are accounted for using the equity method of accounting. Differences in the basis of investments and the separate net asset values of the investees, if any, are amortized into net income or loss over the remaining useful lives of the underlying assets and liabilities, except for the excess related to goodwill. We evaluate our equity method investments for impairment when events or circumstances indicate that the carrying value of the equity method investment may be impaired and that impairment is other than temporary. If an event occurs, we evaluate the recoverability of our carrying value based on the fair value of the investment. If an impairment is indicated, or if we decide to sell an investment in an unconsolidated affiliate, we adjust the carrying values of the asset downward, if necessary, to their estimated fair values.

Asset Retirement Obligations

Revenue Recognition

Credit Risk and Concentrations

Credit Risk and ConcentrationsInherent in our contractual portfolio are certain credit risks. Credit risk is the risk of loss from nonperformance by suppliers, customers or financial counterparties to a contract. We take an active role in managing credit risk and have established control procedures, which are reviewed on an ongoing basis. We attempt to minimize credit risk exposure through credit policies and periodic monitoring procedures as well as through customer deposits, letters of credit and entering into netting agreements that allow for offsetting counterparty receivable and payable balances for certain financial transactions, as deemed appropriate.

Income Taxes

Environmental Costs and Other Contingencies

Price Risk Management Activities

Unit-Based Compensation

Unit-Based CompensationLong-term incentive awards are granted under the Crestwood Equity Partners LP Long Term Incentive Plan (Crestwood LTIP). Unit-based compensation awards consist of restricted units and performance units that are recognized in our consolidated statements of operations based on their grant date at fair value. For restricted units, we generally recognize the expense over the vesting period on a straight line basis. For performance units, we remeasure compensation expense at each balance sheet date because the vesting is subject to the attainment of certain performance and market goals over a three-year period. For those awards that are settled in cash, the associated liability is remeasured at every balance sheet date through settlement, such that the vested portion of the liability is adjusted to reflect its revised fair value through compensation expense.

Basis of Presentation and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

Accounting Policies [Abstract]

Schedule of Inventory, Current

Inventory consisted of the following at December 31, 2020 and 2019 (in millions):


	December 31,
	2020		2019
NGLs, crude oil and natural gas	$	88.0	$	53.2
Spare parts	1.1		0.5
Total inventory	$	89.1	$	53.7

Estimated Useful Lives Of Property, Plant And Equipment

Depreciation is computed by the straight-line method over the estimated useful lives of the assets, as follows:


			Years
Gathering systems and pipelines			15 - 20
Facilities and equipment			3 - 25
Buildings, rights-of-way and easements			1 - 40
Office furniture and fixtures			5- 10
Vehicles			5

Intangible Assets, Useful life

Certain intangible assets are amortized on a straight-line basis over their estimated economic lives, as follows:


			Weighted-Average Life (years)
Customer accounts			22
Revenue contracts			18
Trademarks			10

Our intangible assets consisted of the following at December 31, 2020 and 2019 (in millions):


	December 31,
	2020		2019
Customer accounts(1)	$	488.7	$	438.9

Revenue contracts	631.2		631.2


Trademarks	6.2		6.2

	1,126.1		1,076.3
Less: accumulated amortization	331.8		271.1
Total intangible assets, net	$	794.3	$	805.2

(1)As of December 31, 2020, this amount includes $49.8 million related to customer accounts acquired in conjunction with the NGL Asset Acquisition which is further discussed in Note 3.

The following table summarizes total accumulated amortization of our intangible assets at December 31, 2020 and 2019 (in millions):


	December 31,
	2020		2019
Customer accounts	$	158.5	$	134.4

Revenue contracts	168.6		132.5


Trademarks	4.7		4.2

Total accumulated amortization	$	331.8	$	271.1

Schedule of Goodwill

The following table summarizes the goodwill of our reporting units (in millions):


	G&P				MS&L
	Arrow		Powder River Basin		NGL Marketing and Logistics		Total
January 1, 2019	$	45.9	$	—	$	92.7	$	138.6
Jackalope Acquisition (Note 3)	—		80.3		—		80.3
December 31, 2019	45.9		80.3		92.7		218.9
Impairment	—		(80.3)		—		(80.3)
December 31, 2020	$	45.9	$	—	$	92.7	$	138.6

Acquisition and Divestiture (Tables)

12 Months Ended

Dec. 31, 2020

Business Combinations [Abstract]

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed

The following table summarizes the final valuation of the assets acquired and liabilities assumed at the acquisition date (in millions):



Cash	$	22.5
Other current assets	30.9
Property, plant and equipment	532.9
Intangible assets	306.0
Goodwill	80.3

Current liabilities	(30.4)
Other long-term liabilities	(21.5)
Estimated fair value of 100% interest in Jackalope	920.7
Less:
Elimination of equity investment in Jackalope	226.7
Gain on acquisition of Jackalope	209.4
Total purchase price	$	484.6

Business Acquisition, Pro Forma Information

Crestwood Equity


	Year Ended December 31,
	2019		2018
Revenues	$	3,202.6	$	3,729.5
Net income	$	313.5	$	45.0

Crestwood Midstream


	Year ended December 31,
	2019		2018
Revenues	$	3,202.6	$	3,729.5
Net income	$	304.2	$	36.6

Certain Balance Sheet Information (Tables)

12 Months Ended

Dec. 31, 2020

Balance Sheet Related Disclosures [Abstract]

Property, Plant And Equipment

Property, plant and equipment consisted of the following at December 31, 2020 and 2019 (in millions):


	CEQP				CMLP
	December 31,				December 31,
	2020		2019		2020		2019
Gathering systems and pipelines and related assets	$	1,050.8	$	1,017.8	$	1,193.6	$	1,160.6
Facilities and equipment	2,177.9		1,797.7		2,363.0		1,982.8
Buildings, land, rights-of-way, storage rights and easements	389.0		370.6		392.7		374.3
Vehicles	13.9		12.8		12.1		11.1
Construction in process	83.6		368.7		83.6		368.7
Finance leases	13.3		14.9		13.3		14.9
Office furniture and fixtures	31.1		30.0		31.3		30.2
	3,759.6		3,612.5		4,089.6		3,942.6
Less: accumulated depreciation	842.5		703.4		1,028.3		875.1
Total property, plant and equipment, net	$	2,917.1	$	2,909.1	$	3,061.3	$	3,067.5

Intangible Assets

Certain intangible assets are amortized on a straight-line basis over their estimated economic lives, as follows:


			Weighted-Average Life (years)
Customer accounts			22
Revenue contracts			18
Trademarks			10

Our intangible assets consisted of the following at December 31, 2020 and 2019 (in millions):


	December 31,
	2020		2019
Customer accounts(1)	$	488.7	$	438.9

Revenue contracts	631.2		631.2


Trademarks	6.2		6.2

	1,126.1		1,076.3
Less: accumulated amortization	331.8		271.1
Total intangible assets, net	$	794.3	$	805.2

(1)As of December 31, 2020, this amount includes $49.8 million related to customer accounts acquired in conjunction with the NGL Asset Acquisition which is further discussed in Note 3.

The following table summarizes total accumulated amortization of our intangible assets at December 31, 2020 and 2019 (in millions):


	December 31,
	2020		2019
Customer accounts	$	158.5	$	134.4

Revenue contracts	168.6		132.5


Trademarks	4.7		4.2

Total accumulated amortization	$	331.8	$	271.1

Schedule of Intangible Assets, Future Amortization Expense

Estimated amortization of our intangible assets for the next five years is as follows (in millions):


Year Ending December 31,
2021	$	61.4
2022	$	61.4
2023	$	57.6
2024	$	54.2
2025	$	51.5

Schedule of Accrued Liabilities

Accrued expenses and other liabilities consisted of the following at December 31, 2020 and 2019 (in millions):


	CEQP				CMLP
	December 31,				December 31,
	2020		2019		2020		2019
Accrued expenses	$	48.3	$	61.6	$	46.4	$	60.3
Accrued property taxes	8.4		6.1		8.4		6.1

Income tax payable	0.2		0.3		0.2		0.3
Interest payable	24.9		25.6		24.9		25.6
Accrued additions to property, plant and equipment	12.3		38.0		12.3		38.0
Operating leases	14.7		18.1		14.7		18.1
Finance leases	2.9		3.2		2.9		3.2
Deferred revenue	10.3		8.8		10.3		8.8

Total accrued expenses and other liabilities	$	122.0	$	161.7	$	120.1	$	160.4

Other Noncurrent Liabilities

Other long-term liabilities consisted of the following at December 31, 2020 and 2019 (in millions):


	CEQP				CMLP
	December 31,				December 31,
	2020		2019		2020		2019
Contract liabilities	$	172.2	$	144.7	$	172.2	$	144.7
Operating leases	28.5		41.5		28.5		41.5
Asset retirement obligations	34.1		33.3		34.1		33.3
Other	18.5		25.1		17.0		19.1
Total other long-term liabilities	$	253.3	$	244.6	$	251.8	$	238.6

Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2020

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Asset Retirement Obligations

The following table presents the changes in our net asset retirement obligations for the years ended December 31, 2020 and 2019 (in millions):


	December 31,
	2020		2019
Net asset retirement obligations at January 1	$	34.8	$	28.1
Liabilities acquired(1)	0.3		1.7
Liabilities incurred	0.3		3.4
Liabilities settled	(0.8)		(0.1)
Accretion expense	1.9		1.7
Other(2)	(1.4)		—
Net asset retirement obligations at December 31(3)	$	35.1	$	34.8

(1)Primarily relates to the NGL Asset Acquisition in 2020 and the Jackalope Acquisition in 2019. See Note 3 for a further discussion of these acquisitions.

(2)Relates to obligations included in the sale of our Fayetteville assets. See Note 3 for a further discussion of this divestiture.

(3)Includes $1.0 million and $1.5 million of current ARO liabilities at December 31, 2020 and 2019.

Investments in Unconsolidated Affiliates (Tables)

12 Months Ended

Dec. 31, 2020

Equity Method Investments and Joint Ventures [Abstract]

Net Investments and Earnings (Loss) From Unconsolidated Affiliates

Our net investments in and earnings (loss) from our unconsolidated affiliates are as follows (in millions, unless otherwise stated):


	Ownership Percentage		Investment				Earnings (Loss) from Unconsolidated Affiliates
	December 31,		December 31,				Year Ended December 31,
	2020		2020		2019		2020		2019		2018
Stagecoach Gas Services LLC	50.00	%	$	792.5	$	814.4	$	37.8	$	34.2	$	29.3
Tres Palacios Holdings LLC	50.01	%	35.5		35.9		—		0.9		—
Powder River Basin Industrial Complex, LLC	50.01	%	3.6		8.3		(4.3)		(0.2)		1.5
Crestwood Permian Basin Holdings LLC	50.00	%	112.1		121.8		(1.0)		(5.8)		4.4
Jackalope Gas Gathering Services, L.L.C.(1)	—	%	—		—		—		3.7		18.1
Total			$	943.7	$	980.4	$	32.5	$	32.8	$	53.3

Equity Method Investments

Financial Position Data


	December 31,
	2020										2019
	Current Assets		Non-Current Assets		Current Liabilities		Non-Current Liabilities		Members’ Equity		Current Assets		Non-Current Assets		Current Liabilities		Non-Current Liabilities		Members’ Equity
Stagecoach Gas (1)	$	47.4	$	1,645.5	$	3.9	$	1.4	$	1,687.6	$	50.6	$	1,686.3	$	3.9	$	1.5	$	1,731.5
Other(2)	23.5		661.9		33.6		233.7		418.1		27.6		664.7		37.3		193.2		461.8
Total	$	70.9	$	2,307.4	$	37.5	$	235.1	$	2,105.7	$	78.2	$	2,351.0	$	41.2	$	194.7	$	2,193.3

Operating Results Data


	Year Ended December 31,
	2020						2019						2018
	Operating Revenues		Operating Expenses		Net Income (Loss)		Operating Revenues		Operating Expenses		Net Income		Operating Revenues		Operating Expenses		Net Income
Stagecoach Gas	$	154.3	$	78.8	$	75.5	$	163.8	$	83.6	$	80.6	$	171.4	$	79.3	$	92.1
Crestwood Permian	89.7		92.7		(2.6)		64.8		76.0		(11.1)		82.2		81.3		5.7
Other(1)	31.6		53.4		(22.0)		55.1		49.9		5.1		116.9		81.5		35.6
Total	$	275.6	$	224.9	$	50.9	$	283.7	$	209.5	$	74.6	$	370.5	$	242.1	$	133.4

Distributions and Contributions


	Distributions						Contributions
	Year Ended December 31,						Year Ended December 31,
	2020		2019		2018		2020		2019		2018
Stagecoach Gas(1)	$	59.7	$	52.3	$	48.7	$	—	$	2.1	$	—
Tres Holdings	6.4		6.3		5.3		6.0		6.3		2.5
PRBIC	0.4		—		1.9		—		0.2		0.2
Crestwood Permian(1)	11.9		5.0		14.7		3.4		28.3		12.6
Jackalope	—		11.6		32.4		—		24.4		49.1
Total	$	78.4	$	75.2	$	103.0	$	9.4	$	61.3	$	64.4

Risk Management (Tables)

12 Months Ended

Dec. 31, 2020

Risk Management - Notional Amounts and Terms of Companys Derivative Financial Instruments [Abstract]

Derivatives Not Designated as Hedging Instruments

The following table summarizes the impact to our consolidated statements of operations related to our commodity-based derivatives reflected in operating revenues and costs of product/services sold during the years ended December 31, 2020, 2019 and 2018 (in millions):


	December 31,
	2020		2019		2018
Product revenues	$	214.3	$	252.3	$	343.3
Gain (loss) reflected in costs of product/services sold	$	(20.7)	$	19.5	$	29.6

Notional Amounts And Terms Of Company's Derivative Financial Instruments

The notional amounts of our derivative financial instruments include the following:


	December 31, 2020		December 31, 2019
	Fixed Price Payor	Fixed Price Receiver	Fixed Price Payor	Fixed Price Receiver
Propane, ethane, butane, heating oil and crude oil (MMBbls)	72.7	76.5	33.5	36.6
Natural gas (Bcf)	22.6	28.6	3.7	8.7

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value

The following table presents the fair value of our commodity derivative instruments with credit-risk-related contingent features and their associated collateral (in millions):


	December 31,
	2020		2019
Aggregate fair value of derivative instruments with credit-risk-related contingent features(1)	$	38.5	$	1.6
NYMEX-related net derivative asset (liability) position	$	35.9	$	(28.8)
NYMEX-related cash collateral (received) posted	$	(18.3)	$	40.4
Cash collateral received, net	$	12.4	$	16.9

(1) At December 31, 2020 and 2019, we posted less than $0.1 million of collateral associated with these derivatives.

Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2020

Fair Value Disclosures [Abstract]

Assets And Liabilities Measured At Fair Value On Recurring Basis


	December 31, 2020
	Level 1		Level 2		Level 3		Gross Fair Value		Contract Netting(1)		Collateral/Margin Received or Paid		Fair Value
Assets
Assets from price risk management	$	20.2	$	480.5	$	—	$	500.7	$	(455.0)	$	(18.5)	$	27.2
Suburban Propane Partners, L.P. units(2)	2.1		—		—		2.1		—		—		2.1
Total assets at fair value	$	22.3	$	480.5	$	—	$	502.8	$	(455.0)	$	(18.5)	$	29.3

Liabilities
Liabilities from price risk management	$	25.1	$	494.0	$	—	$	519.1	$	(455.0)	$	12.2	$	76.3

Total liabilities at fair value	$	25.1	$	494.0	$	—	$	519.1	$	(455.0)	$	12.2	$	76.3

	December 31, 2019
	Level 1		Level 2		Level 3		Gross Fair Value		Contract Netting(1)		Collateral/Margin Received or Paid		Fair Value
Assets
Assets from price risk management	$	3.7	$	164.0	$	—	$	167.7	$	(122.3)	$	(2.2)	$	43.2
Suburban Propane Partners, L.P. units(2)	3.1		—		—		3.1		—		—		3.1
Total assets at fair value	$	6.8	$	164.0	$	—	$	170.8	$	(122.3)	$	(2.2)	$	46.3

Liabilities
Liabilities from price risk management	$	2.8	$	151.9	$	—	$	154.7	$	(122.3)	$	(25.7)	$	6.7
Total liabilities at fair value	$	2.8	$	151.9	$	—	$	154.7	$	(122.3)	$	(25.7)	$	6.7

(1)Amounts represent the impact of legally enforceable master netting agreements that allow us to settle positive and negative positions.

Schedule of Carrying Values and Estimated Fair Values of Debt Instruments

The following table represents the carrying amount (reduced for deferred financing costs associated with the respective notes) and fair value of our senior notes (in millions):


	December 31, 2020				December 31, 2019
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
2023 Senior Notes	$	683.8	$	691.5	$	695.1	$	714.0
2025 Senior Notes	$	495.5	$	509.9	$	494.4	$	514.4
2027 Senior Notes	$	593.2	$	594.1	$	592.1	$	610.1

Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2020

Text Block [Abstract]

Components Of Long-Term Debt

Long-term debt consisted of the following at December 31, 2020 and 2019, (in millions):


	December 31,
	2020		2019
Credit Facility	$	719.0	$	557.0
2023 Senior Notes	687.2		700.0
2025 Senior Notes	500.0		500.0
2027 Senior Notes	600.0		600.0
Other(1)	0.4		0.6
Less: deferred financing costs, net	22.6		29.1
Total debt	2,484.0		2,328.5
Less: current portion	0.2		0.2
Total long-term debt, less current portion	$	2,483.8	$	2,328.3

Schedule of Maturities of Long-term Debt

The aggregate maturities of principal amounts on our outstanding long-term debt as of December 31, 2020 for the next five years and in total thereafter are as follows (in millions):


2021	$	0.2
2022	0.2
2023	1,406.2
2024	—
2025	500.0
Thereafter	600.0
Total debt	$	2,506.6

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Paragraph 1
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 505
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 942
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-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
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-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

+ Details

Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2020

Commitments and Contingencies Disclosure [Abstract]

Purchase Commitment, Excluding Long-term Commitment

The following table summarizes CEQP’s and CMLP’s self-insurance reserves at December 31, 2020 and 2019 (in millions):


	CEQP				CMLP
	December 31,				December 31,
	2020		2019		2020		2019
Self-insurance reserves(1)	$	7.7	$	9.7	$	6.7	$	8.3

(1)At December 31, 2020, CEQP and CMLP classified approximately $4.8 million and $4.1 million, respectively of these reserves as other long-term liabilities on their consolidated balance sheets.

Assets And Liabilities, Lessee

The following table summarizes the balance sheet information related to our operating and finance leases at December 31, 2020 and 2019 (in millions):


	December 31,
	2020		2019
Operating Leases
Operating lease right-of-use assets, net	$	36.8	$	53.8

Accrued expenses and other liabilities	$	14.7	$	18.1
Other long-term liabilities	28.5		41.5
Total operating lease liabilities	$	43.2	$	59.6
Finance Leases
Property, plant and equipment	$	13.3	$	14.9
Less: accumulated depreciation	7.9		5.4
Property, plant and equipment, net	$	5.4	$	9.5

Accrued expenses and other liabilities	$	2.9	$	3.2
Other long-term liabilities	1.9		5.2
Total finance lease liabilities	$	4.8	$	8.4

Lease, Cost

The following table presents the weighted-average remaining lease term and the weighted-average discount rate associated with our operating and finance leases as of December 31, 2020 and 2019:


	December 31,
	2020		2019
Weighted-average remaining lease term (in years):
Operating leases(1)	4.3		4.4
Finance leases(2)	1.7		2.6
Weighted-average discount rate:
Operating leases(3)	6.2	%	5.9	%
Finance leases(3)	7.3	%	7.3	%

(1) Remaining terms vary from one year to 19 years as of December 31, 2020.

(2) Remaining terms vary from one year to four years as of December 31, 2020.

The following table presents the costs and sublease income associated with our operating and finance leases for the years ended December 31, 2020 and 2019 (in millions):


	Year Ended December 31,
	2020		2019
Operating leases:
Operating lease expense(1)(2)	$	27.2	$	28.3
Sublease income(3)	(1.7)		(1.0)
Total operating lease expense, net	$	25.5	$	27.3
Finance leases:
Amortization of right-of-use assets(4)	$	3.5	$	3.6
Interest on lease liabilities(5)	0.5		0.7
Total finance lease expense	$	4.0	$	4.3

(2)Includes short-term and variable lease costs of approximately $5.5 million and $3.7 million for the years ended December 31, 2020 and 2019.

(3)Included in marketing, supply and logistics service revenues on our consolidated statements of operations.

(4)Included in depreciation, amortization and accretion expense on our consolidated statements of operations.

(5)Included in interest and debt expense, net on our consolidated statements of operations.

The following table presents supplemental cash flow information for our operating and finance leases for the years ended December 31, 2020 and 2019 (in millions):


	Year Ended December 31,
	2020		2019
Cash paid for lease liabilities:
Operating cash flows from operating leases	$	21.3	$	22.9
Operating cash flows from finance leases	$	0.5	$	0.7
Financing cash flows from finance leases	$	3.1	$	3.5
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$	2.1	$	4.2
Finance leases	$	0.4	$	1.8

Lessee, Operating Lease, Liability, Maturity

The following table presents the future minimum lease liabilities under Topic 842 for our leases as of December 31, 2020 for the next five years and in total thereafter (in millions):


Year Ending December 31,	Operating Leases		Finance Leases		Total
2021	$	16.6	$	3.2	$	19.8
2022	11.3		1.8		13.1
2023	7.0		0.1		7.1
2024	6.3		—		6.3
2025	3.2		—		3.2
Thereafter	5.0		—		5.0
Total lease payments	49.4		5.1		54.5
Less: interest	6.2		0.3		6.5
Present value of lease liabilities	$	43.2	$	4.8	$	48.0

Leases (Tables)

12 Months Ended

Dec. 31, 2020

Leases [Abstract]

Assets And Liabilities, Lessee

The following table summarizes the balance sheet information related to our operating and finance leases at December 31, 2020 and 2019 (in millions):


	December 31,
	2020		2019
Operating Leases
Operating lease right-of-use assets, net	$	36.8	$	53.8

Accrued expenses and other liabilities	$	14.7	$	18.1
Other long-term liabilities	28.5		41.5
Total operating lease liabilities	$	43.2	$	59.6
Finance Leases
Property, plant and equipment	$	13.3	$	14.9
Less: accumulated depreciation	7.9		5.4
Property, plant and equipment, net	$	5.4	$	9.5

Accrued expenses and other liabilities	$	2.9	$	3.2
Other long-term liabilities	1.9		5.2
Total finance lease liabilities	$	4.8	$	8.4

Lease, Cost

The following table presents the weighted-average remaining lease term and the weighted-average discount rate associated with our operating and finance leases as of December 31, 2020 and 2019:


	December 31,
	2020		2019
Weighted-average remaining lease term (in years):
Operating leases(1)	4.3		4.4
Finance leases(2)	1.7		2.6
Weighted-average discount rate:
Operating leases(3)	6.2	%	5.9	%
Finance leases(3)	7.3	%	7.3	%

(1) Remaining terms vary from one year to 19 years as of December 31, 2020.

(2) Remaining terms vary from one year to four years as of December 31, 2020.

The following table presents the costs and sublease income associated with our operating and finance leases for the years ended December 31, 2020 and 2019 (in millions):


	Year Ended December 31,
	2020		2019
Operating leases:
Operating lease expense(1)(2)	$	27.2	$	28.3
Sublease income(3)	(1.7)		(1.0)
Total operating lease expense, net	$	25.5	$	27.3
Finance leases:
Amortization of right-of-use assets(4)	$	3.5	$	3.6
Interest on lease liabilities(5)	0.5		0.7
Total finance lease expense	$	4.0	$	4.3

(2)Includes short-term and variable lease costs of approximately $5.5 million and $3.7 million for the years ended December 31, 2020 and 2019.

(3)Included in marketing, supply and logistics service revenues on our consolidated statements of operations.

(4)Included in depreciation, amortization and accretion expense on our consolidated statements of operations.

(5)Included in interest and debt expense, net on our consolidated statements of operations.

The following table presents supplemental cash flow information for our operating and finance leases for the years ended December 31, 2020 and 2019 (in millions):


	Year Ended December 31,
	2020		2019
Cash paid for lease liabilities:
Operating cash flows from operating leases	$	21.3	$	22.9
Operating cash flows from finance leases	$	0.5	$	0.7
Financing cash flows from finance leases	$	3.1	$	3.5
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$	2.1	$	4.2
Finance leases	$	0.4	$	1.8

Lessee, Operating Lease, Liability, Maturity

The following table presents the future minimum lease liabilities under Topic 842 for our leases as of December 31, 2020 for the next five years and in total thereafter (in millions):


Year Ending December 31,	Operating Leases		Finance Leases		Total
2021	$	16.6	$	3.2	$	19.8
2022	11.3		1.8		13.1
2023	7.0		0.1		7.1
2024	6.3		—		6.3
2025	3.2		—		3.2
Thereafter	5.0		—		5.0
Total lease payments	49.4		5.1		54.5
Less: interest	6.2		0.3		6.5
Present value of lease liabilities	$	43.2	$	4.8	$	48.0

Partners' Capital and Non-Controlling Partner (Tables)

12 Months Ended

Dec. 31, 2020

Distribution Made to Limited Liability Company (LLC) Member [Line Items]

Schedule of Distributions Made to Members or Limited Partners, by Distribution

A summary of CEQP’s limited partner quarterly cash distributions for the years ended December 31, 2020, 2019 and 2018 is presented below:


Record Date	Payment Date	Per Unit Rate		Cash Distributions (in millions)
2020
February 7, 2020	February 14, 2020	$	0.625	$	45.3
May 8, 2020	May 15, 2020	$	0.625	45.7
August 7, 2020	August 14, 2020	$	0.625	45.7
November 6, 2020	November 13, 2020	$	0.625	46.0
				$	182.7
2019
February 7, 2019	February 14, 2019	$	0.60	$	43.1
May 8, 2019	May 15, 2019	$	0.60	43.1
August 7, 2019	August 14, 2019	$	0.60	43.1
November 7, 2019	November 14, 2019	$	0.60	43.1
				$	172.4
2018
February 7, 2018	February 14, 2018	$	0.60	$	42.7
May 8, 2018	May 15, 2018	$	0.60	42.7
August 7, 2018	August 14, 2018	$	0.60	42.7
November 7, 2018	November 14, 2018	$	0.60	42.7
				$	170.8

Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net

The following table shows the change in the interest of our non-controlling partner in subsidiary at December 31, 2020 and 2019 (in millions):


Balance at December 31, 2018	$	—
Reclassification of Series A-2 Preferred Units	178.8
Issuance of Series A-3 Preferred Units	235.0
Distributions to non-controlling partner	(18.4)
Net income attributable to non-controlling partner	30.8
Balance at December 31, 2019	426.2
Contributions from non-controlling partner	2.8
Distributions to non-controlling partner	(37.1)
Net income attributable to non-controlling partner	40.8
Balance at December 31, 2020	$	432.7

Equity Plans (Tables)

12 Months Ended

Dec. 31, 2020

Equity [Abstract]

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award

The following table summarizes information regarding restricted, phantom and performance unit activity during the years ended December 31, 2020, 2019 and 2018.


	Units	Weighted-Average Grant Date Fair Value
Unvested - January 1, 2018	1,830,096	$	25.21
Granted - restricted units	1,144,017	$	25.80
Granted - phantom units	7,750	$	26.10
Granted - performance units	901	$	25.60
Vested - restricted units	(617,807)	$	23.73
Vested - phantom units	(105,809)	$	49.45
Vested - performance units	(11,772)	$	28.87
Forfeited - restricted units	(53,530)	$	23.36
Forfeited - phantom units	(6)	$	49.45
Forfeited - performance units	(5,870)	$	30.45
Unvested - December 31, 2018	2,187,970	$	24.78
Granted - restricted units	988,096	$	31.48
Granted - phantom units	7,164	$	29.03
Granted - performance units	238,263	$	34.21
Vested - restricted units	(985,751)	$	23.39

Vested - performance units	(32,246)	$	34.21
Forfeited - restricted units	(47,547)	$	27.85


Unvested - December 31, 2019	2,355,949	$	28.94
Granted - restricted units	1,569,451	$	25.42
Granted - phantom units	17,726	$	28.48
Granted - performance units	715,674	$	28.46
Vested - restricted units	(906,275)	$	28.75
Vested - phantom units	(2,118)	$	26.63
Vested - performance units	(846,306)	$	29.85
Forfeited - restricted units	(149,001)	$	28.24
Forfeited - phantom units	(14,157)	$	27.91
Forfeited - performance units	(17,087)	$	27.35
Unvested - December 31, 2020	2,723,856	$	26.62

Earnings Per Limited Partner Unit (Tables)

12 Months Ended

Dec. 31, 2020

Earnings Per Share [Abstract]

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The following table summarizes information regarding the weighted-average of common units excluded during the years ended December 31, 2020, 2019 and 2018 (in millions):


	Year Ended December 31,
	2020	2019	2018
Preferred units (1)	7.1	7.1	7.1
Crestwood Niobrara’s preferred units(1)	5.7	—	6.5
Subordinated units(2)	0.4	—	0.4
Stock-based compensation performance units(2)	0.1	—	0.4

(1)See Note 12 for additional information regarding the potential conversion of our preferred units and Crestwood Niobrara’s preferred units to common units.

(2)For a description of our subordinated and stock-based compensation performance units, see Note 12 and Note 13, respectively.


	Year Ended December 31,
	2020		2019		2018
Common unitholders’ interest in net income (loss)	$	(116.2)	$	223.6	$	(9.3)


Dilutive effect of net income attributable to subordinated units	—		1.4		—
Diluted net income (loss)	$	(116.2)	$	225.0	$	(9.3)

Weighted-average limited partners’ units outstanding - basic	73.2		71.8		71.2
Dilutive effect of Crestwood Niobrara preferred units	—		4.3		—

Dilutive effect of subordinated units	—		0.4		—
Dilutive effect of stock-based compensation performance units	—		0.4		—
Weighted-average limited partners’ units outstanding - diluted	73.2		76.9		71.2

Net income (loss) per limited partner unit:
Basic	$	(1.59)	$	3.11	$	(0.13)
Diluted	$	(1.59)	$	2.93	$	(0.13)

Segments (Tables)

12 Months Ended

Dec. 31, 2020

Segment Reporting [Abstract]

Reconciliation of Net Income (Loss) to Earnings Before Interest, Taxes, Depreciation and Amortization]

Below is a reconciliation of CEQP’s and CMLP’s net income (loss) to EBITDA (in millions):


	CEQP						CMLP
	Year Ended December 31,						Year Ended December 31,
	2020		2019		2018		2020		2019		2018
Net income (loss)	$	(15.3)	$	319.9	$	67.0	$	(23.4)	$	310.6	$	58.6
Add:
Interest and debt expense, net	133.6		115.4		99.2		133.6		115.4		99.2
(Gain) loss on modification/extinguishment of debt	(0.1)		—		0.9		(0.1)		—		0.9
Provision (benefit) for income taxes	0.4		0.3		0.1		(0.1)		0.3		—
Depreciation, amortization and accretion	237.4		195.8		168.7		251.5		209.9		181.4
EBITDA	$	356.0	$	631.4	$	335.9	$	361.5	$	636.2	$	340.1

Reportable Segments

Segment Information


	Year Ended December 31, 2020
	Gathering and Processing		Storage and Transportation		Marketing, Supply and Logistics		Corporate		Total
Crestwood Midstream
Revenues	$	631.4	$	13.8	$	1,609.1	$	—	$	2,254.3
Intersegment revenues	159.8		9.2		(169.0)		—		—
Costs of product/services sold	261.5		0.2		1,338.8		—		1,600.5
Operations and maintenance expense	84.9		3.6		43.3		—		131.8
General and administrative expense	—		—		—		86.7		86.7
Gain (loss) on long-lived assets, net	(23.8)		—		(2.4)		0.2		(26.0)
Goodwill impairment	(80.3)		—		—		—		(80.3)


Earnings (loss) from unconsolidated affiliates, net	(1.0)		33.5		—		—		32.5

Crestwood Midstream EBITDA	$	339.7	$	52.7	$	55.6	$	(86.5)	$	361.5
Crestwood Equity
General and administrative expense	—		—		—		4.8		4.8

Other expense	—		—		—		(0.7)		(0.7)
Crestwood Equity EBITDA	$	339.7	$	52.7	$	55.6	$	(92.0)	$	356.0


	Year Ended December 31, 2019
	Gathering and Processing		Storage and Transportation		Marketing, Supply and Logistics		Corporate		Total
Crestwood Midstream
Revenues	$	835.8	$	20.4	$	2,325.7	$	—	$	3,181.9
Intersegment revenues	175.0		14.2		(189.2)		—		—
Costs of product/services sold	526.1		0.2		2,018.6		—		2,544.9
Operations and maintenance expense	98.7		4.0		36.1		—		138.8
General and administrative expense	—		—		—		98.2		98.2
Gain (loss) on long-lived assets, net	(6.2)		—		(0.2)		0.2		(6.2)
Gain on acquisition	209.4		—		—		—		209.4


Earnings (loss) from unconsolidated affiliates, net	(2.1)		34.9		—		—		32.8
Other income, net	—		—		—		0.2		0.2
Crestwood Midstream EBITDA	$	587.1	$	65.3	$	81.6	$	(97.8)	$	636.2
Crestwood Equity
General and administrative expense	—		—		—		5.2		5.2

Other income	—		—		—		0.4		0.4
Crestwood Equity EBITDA	$	587.1	$	65.3	$	81.6	$	(102.6)	$	631.4


	Year Ended December 31, 2018
	Gathering and Processing		Storage and Transportation		Marketing, Supply and Logistics		Corporate		Total
Crestwood Midstream
Revenues	$	946.7	$	17.1	$	2,690.3	$	—	$	3,654.1
Intersegment revenues	192.4		10.5		(202.9)		—		—
Costs of product/services sold	767.0		0.2		2,362.2		—		3,129.4
Operations and maintenance expense	71.7		3.3		50.8		—		125.8
General and administrative expense	—		—		—		83.5		83.5
Gain (loss) on long-lived assets, net	(3.0)		—		(27.3)		1.7		(28.6)


Earnings from unconsolidated affiliates, net	22.5		30.8		—		—		53.3

Crestwood Midstream EBITDA	$	319.9	$	54.9	$	47.1	$	(81.8)	$	340.1
Crestwood Equity
General and administrative expense	—		—		—		4.6		4.6

Other income	—		—		—		0.4		0.4
Crestwood Equity EBITDA	$	319.9	$	54.9	$	47.1	$	(86.0)	$	335.9

Other Segment Information


	CEQP				CMLP
	Year Ended December 31,				Year Ended December 31,
	2020		2019		2020		2019
Total Assets
Gathering and Processing	$	3,464.6	$	3,715.3	$	3,609.7	$	3,874.7
Storage and Transportation	944.6		980.2		944.6		980.2
Marketing, Supply and Logistics	805.0		624.7		805.0		624.7
Corporate	29.5		29.1		26.2		24.4
Total Assets	$	5,243.7	$	5,349.3	$	5,385.5	$	5,504.0



	Year Ended December 31,
	2020		2019		2018
Purchases of property, plant and equipment (1)
Gathering and Processing	$	159.7	$	447.7	$	294.7
Storage and Transportation	0.4		0.1		0.6
Marketing, Supply and Logistics	7.1		5.8		5.6
Corporate	1.1		1.9		4.6
Total Purchases of property, plant and equipment	$	168.3	$	455.5	$	305.5

(1)Amounts represent both Crestwood Midstream and Crestwood Equity.

Revenues (Tables)

12 Months Ended

Dec. 31, 2020

Revenue from Contract with Customer [Abstract]

Contract with Customer, Asset and Liability

The following table summarizes our contract assets and contract liabilities (in millions):


	December 31,
	2020		2019
Contract assets (non-current)	$	1.0	$	1.2
Contract liabilities (current)(1)	$	10.3	$	8.8
Contract liabilities (non-current)(1)	$	172.2	$	144.7

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction

The following table summarizes the transaction price allocated to our remaining performance obligations under certain contracts that have not been recognized as of December 31, 2020 (in millions):


2021	$	94.2
2022	54.1
2023	8.0
2024	3.3


Total	$	159.6

Disaggregation of Revenue


	Year Ended December 31, 2020
	Gathering and Processing		Storage and Transportation		Marketing, Supply and Logistics		Intersegment Elimination		Total
Revenues:
Topic 606 revenues
Gathering
Natural gas	$	140.6	$	—	$	—	$	—	$	140.6
Crude oil	95.3		—		—		—		95.3
Water	92.6		—		—		—		92.6
Processing
Natural gas	31.9		—		—		—		31.9

Compression
Natural gas	23.9		—		—		—		23.9
Storage
Crude oil	1.1		4.0		—		(2.4)		2.7
NGLs	—		—		13.1		—		13.1
Pipeline
Crude oil	—		6.1		—		(2.0)		4.1
NGLs	—		—		0.3		—		0.3
Transportation
Crude oil	6.2		—		1.9		(0.1)		8.0
NGLs	—		—		10.9		—		10.9

Rail Loading
Crude oil	—		11.8		—		(4.4)		7.4

Product Sales
Natural gas	53.4		—		90.9		(52.8)		91.5
Crude oil	292.2		—		660.7		(53.0)		899.9
NGLs	54.0		—		614.2		(53.6)		614.6
Other	—		1.1		1.1		(0.7)		1.5
Total Topic 606 revenues	791.2		23.0		1,393.1		(169.0)		2,038.3
Non-Topic 606 revenues	—		—		216.0		—		216.0
Total revenues	$	791.2	$	23.0	$	1,609.1	$	(169.0)	$	2,254.3


	Year Ended December 31, 2019
	Gathering and Processing		Storage and Transportation		Marketing, Supply and Logistics		Intersegment Elimination		Total
Revenues:
Topic 606 revenues
Gathering
Natural gas	$	163.2	$	—	$	—	$	—	$	163.2
Crude oil	75.0		—		—		—		75.0
Water	79.6		—		—		—		79.6
Processing
Natural gas	28.9		—		—		—		28.9

Compression
Natural gas	24.9		—		—		—		24.9
Storage
Crude oil	1.9		5.4		—		(2.3)		5.0
NGLs	—		—		6.3		—		6.3
Pipeline
Crude oil	—		7.9		—		(2.7)		5.2
Transportation
Crude oil	7.0		—		5.8		(0.1)		12.7
NGLs	—		—		11.7		—		11.7
Water	—		—		0.2		—		0.2
Rail Loading
Crude oil	—		16.7		—		(5.7)		11.0

Product Sales
Natural gas	56.8		—		72.3		(33.4)		95.7
Crude oil	532.1		—		1,315.6		(121.1)		1,726.6
NGLs	41.4		—		659.3		(20.0)		680.7
Other	—		4.6		1.2		(3.9)		1.9
Total Topic 606 revenues	1,010.8		34.6		2,072.4		(189.2)		2,928.6
Non-Topic 606 revenues	—		—		253.3		—		253.3
Total revenues	$	1,010.8	$	34.6	$	2,325.7	$	(189.2)	$	3,181.9


	Year Ended December 31, 2018
	Gathering and Processing		Storage and Transportation		Marketing, Supply and Logistics		Intersegment Elimination		Total
Revenues:
Topic 606 revenues
Gathering
Natural gas	$	134.9	$	—	$	—	$	—	$	134.9
Crude oil	38.8		—		—		—		38.8
Water	58.0		—		—		—		58.0
Processing
Natural gas	10.7		—		—		—		10.7
NGLs	—		—		6.1		—		6.1
Compression
Natural gas	29.1		—		—		—		29.1
Storage
Crude oil	1.8		4.2		—		(1.5)		4.5
NGLs	—		—		8.6		—		8.6
Pipeline
Crude oil	—		7.1		—		(2.3)		4.8
Transportation
Crude oil	2.9		—		5.9		—		8.8
NGLs	—		—		26.9		—		26.9
Water	—		—		0.3		—		0.3
Rail Loading
Crude oil	—		14.3		0.2		(5.2)		9.3
NGLs	—		—		3.1		—		3.1
Product Sales
Natural gas	55.8		—		70.9		(16.6)		110.1
Crude oil	722.9		—		978.0		(151.3)		1,549.6
NGLs	84.2		—		1,247.0		(24.5)		1,306.7
Other	—		2.0		—		(1.5)		0.5
Total Topic 606 revenues	1,139.1		27.6		2,347.0		(202.9)		3,310.8
Non-Topic 606 revenues	—		—		343.3		—		343.3
Total revenues	$	1,139.1	$	27.6	$	2,690.3	$	(202.9)	$	3,654.1

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2020

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit)

The (provision) benefit for income taxes for the years ended December 31, 2020, 2019, and 2018 consisted of the following (in millions):


	CEQP						CMLP
	Year Ended December 31,						Year Ended December 31,
	2020		2019		2018		2020		2019		2018
Current:
Federal	$	(0.2)	$	(0.1)	$	(0.5)	$	0.1	$	0.1	$	0.1
State	(0.1)		(0.2)		(0.3)		—		(0.2)		(0.2)
Total current	(0.3)		(0.3)		(0.8)		0.1		(0.1)		(0.1)
Deferred:
Federal	(0.1)		0.1		0.5		—		—		—
State	—		(0.1)		0.2		—		(0.2)		0.1
Total deferred	(0.1)		—		0.7		—		(0.2)		0.1
(Provision) benefit for income taxes	$	(0.4)	$	(0.3)	$	(0.1)	$	0.1	$	(0.3)	$	—

Schedule of Deferred Tax Assets and Liabilities

Components of our deferred income taxes at December 31, 2020 and 2019 are as follows (in millions).


	CEQP				CMLP
	December 31,				December 31,
	2020		2019		2020		2019


Total deferred tax asset(1)	$	0.2	$	0.2	$	—	$	—


Total deferred tax liability(1)	(2.9)		(2.8)		(0.7)		(0.7)
Net deferred tax liability	$	(2.7)	$	(2.6)	$	(0.7)	$	(0.7)

Related Party Transactions (Tables)

12 Months Ended

Dec. 31, 2020

Schedule of Related Party Transactions

The following table shows transactions with our affiliates which are reflected in our consolidated statements of operations for the years December 31, 2020, 2019 and 2018 (in millions):


	Year Ended December 31,
	2020		2019		2018
Revenues at CEQP and CMLP(1)	$	27.8	$	2.9	$	1.0
Costs of product/services sold at CEQP and CMLP(2)	$	21.0	$	45.4	$	134.7
Operations and maintenance expenses at CEQP and CMLP(3)	$	21.8	$	25.9	$	28.7
General and administrative expenses charged by CEQP to CMLP, net(4)	$	31.1	$	41.4	$	20.7
General and administrative expenses at CEQP charged to (from) Crestwood Holdings, net(5)	$	6.5	$	(0.6)	$	(2.7)

The following table shows accounts receivable and accounts payable from our affiliates as of December 31, 2020 and 2019 (in millions):


	December 31,
	2020		2019
Accounts receivable at CEQP and CMLP	$	2.5	$	7.3
Accounts payable at CEQP	$	7.5	$	15.6
Accounts payable at CMLP	$	5.0	$	13.1

Organization and Description of Business (Narrative) (Details)	12 Months Ended
	Dec. 31, 2020 segment
Partnership Organization And Basis Of Presentation [Line Items]
Number of operating segments	3
Crestwood Equity Partners LP \| CMLP
Partnership Organization And Basis Of Presentation [Line Items]
Limited partnership interest	99.90%
Crestwood Gas Services GP, LLC \| CMLP
Partnership Organization And Basis Of Presentation [Line Items]
Limited partnership interest	0.10%
Common Unit Capital \| Crestwood Holdings \| Crestwood Equity Partners LP
Partnership Organization And Basis Of Presentation [Line Items]
General partner ownership percentage	24.00%

Basis of Presentation and Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2020	Oct. 31, 2018	Jan. 01, 2018
Summary Of Significant Accounting Policies [Line Items]
Operating leases	$ 28.5	$ 41.5
Property, plant and equipment, net	2,917.1	2,909.1
Inventory	89.1	53.7
Net proceeds from sale of assets	27.3	0.8	$ 79.5
Debt Issuance Costs, Net	22.6	29.1
Property, plant and equipment	$ 3,759.6	3,612.5
Percentage of gross income from qualifying sources required to be subject to federal income tax, minimum	90.00%
Goodwill impairment	$ 80.3	0.0	0.0
Liabilities, Current	377.8	357.8
Operating lease right-of-use assets, net	36.8	53.8
Accrued expenses and other liabilities	122.0	161.7
Other long-term liabilities	253.3	244.6
Investments in unconsolidated affiliates	943.7	980.4
Allowance for doubtful accounts	0.9	0.3
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property	(26.0)	(6.2)	(28.6)
Goodwill impairment	0.0	(209.4)	0.0
Fayetteville
Summary Of Significant Accounting Policies [Line Items]
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property	19.9
West Coast
Summary Of Significant Accounting Policies [Line Items]
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property			26.9
Cumulative Effect, Period of Adoption, Adjustment
Summary Of Significant Accounting Policies [Line Items]
Partners' Capital				$ 0.7		$ (7.5)
Accounts Receivable, Allowance for Credit Loss				$ 0.7
Natural Gas Liquids
Summary Of Significant Accounting Policies [Line Items]
Inventory	88.0	53.2
CMLP
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, net	3,061.3	3,067.5
Inventory	89.1	53.7
Net proceeds from sale of assets	27.3	0.8	79.5
Property, plant and equipment	4,089.6	3,942.6
Goodwill impairment	80.3	0.0	0.0
Goodwill, Impaired, Accumulated Impairment Loss	1,479.6
Liabilities, Current	373.4	353.9
Operating lease right-of-use assets, net	36.8	53.8
Accrued expenses and other liabilities	120.1	160.4
Other long-term liabilities	251.8	238.6
Partners' Capital	(1,805.1)	(2,099.3)
Investments in unconsolidated affiliates	943.7	980.4
Allowance for doubtful accounts	0.9	0.3
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property	(26.0)	(6.2)	(28.6)
Goodwill impairment	0.0	(209.4)	$ 0.0
Crestwood Equity Partners LP
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, net	2,917.1	2,909.1
Property, plant and equipment	3,759.6	3,612.5
Goodwill, Impaired, Accumulated Impairment Loss	1,736.8
Accrued expenses and other liabilities	122.0	161.7
Crestwood Permian Basin Holdings LLC
Summary Of Significant Accounting Policies [Line Items]
Guarantee to third party amount	$ 10.0
Equity method ownership percentage	50.00%			50.00%
Investments in unconsolidated affiliates	$ 112.1	121.8
Crestwood Permian Basin Holdings LLC \| Cumulative Effect, Period of Adoption, Adjustment
Summary Of Significant Accounting Policies [Line Items]
Partners' Capital				$ (0.2)
Investments in unconsolidated affiliates				$ 0.2
Crestwood Permian Basin Holdings LLC \| Crestwood Equity Partners LP
Summary Of Significant Accounting Policies [Line Items]
Equity method ownership percentage			50.00%
Stagecoach Gas Services LLC
Summary Of Significant Accounting Policies [Line Items]
Equity method ownership percentage	50.00%
Investments in unconsolidated affiliates	$ 792.5	814.4
West Coast \| Marketing Supply and Logistics
Summary Of Significant Accounting Policies [Line Items]
Disposal Group, Including Discontinued Operation, Consideration					$ 70.5
Gain (Loss) on Sale of Assets and Asset Impairment Charges			$ 26.9
Operating Leases [Member]
Summary Of Significant Accounting Policies [Line Items]
Operating leases	28.5	41.5
Operating lease right-of-use assets, net	36.8	53.8
Accrued expenses and other liabilities	14.7	18.1
Finance Lease [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, net	5.4	9.5
Property, plant and equipment	13.3	14.9
Accrued expenses and other liabilities	2.9	3.2
Other long-term liabilities	$ 1.9	$ 5.2

Basis of Presentation and Summary of Significant Accounting Policies (Estimated Useful Lives Of Property, Plant And Equipment) (Details)	12 Months Ended
	Dec. 31, 2020
Gathering systems and pipelines and related assets \| Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	15 years
Gathering systems and pipelines and related assets \| Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	20 years
Facilities and equipment \| Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	3 years
Facilities and equipment \| Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	25 years
Buildings, land, rights-of-way, storage rights and easements \| Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	1 year
Buildings, land, rights-of-way, storage rights and easements \| Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	40 years
Office furniture and fixtures \| Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	5 years
Office furniture and fixtures \| Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	10 years
Vehicles \| Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	5 years

Basis of Presentation and Summary of Significant Accounting Policies (Estimated Economic Lives Of Intangible Assets) (Details)	12 Months Ended
	Dec. 31, 2020
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	22 years
Trademarks
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	10 years
Revenue Contracts
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	18 years

Basis of Presentation and Summary of Significant Accounting Policies (Goodwill, by Reporting Unit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Apr. 09, 2019	Jan. 01, 2019
Goodwill [Line Items]
Goodwill	$ 138.6	$ 218.9			$ 138.6
Goodwill acquired		80.3
Goodwill Impairments during the Period	(80.3)	0.0	$ 0.0
Arrow
Goodwill [Line Items]
Goodwill	45.9	45.9			45.9
Goodwill acquired		0.0
Goodwill Impairments during the Period	0.0
NGL Marketing and Logistics
Goodwill [Line Items]
Goodwill	92.7	92.7			92.7
Goodwill acquired		0.0
Goodwill Impairments during the Period	0.0
Powder River Basin
Goodwill [Line Items]
Goodwill	0.0	80.3			$ 0.0
Goodwill acquired		80.3
Goodwill Impairments during the Period	(80.3)
CMLP
Goodwill [Line Items]
Goodwill	138.6	218.9
Goodwill Impairments during the Period	(80.3)	0.0	$ 0.0
Williams Partners LP \| Crestwood Niobrara LLC
Goodwill [Line Items]
Additional voting interest acquired				50.00%
Arrow \| Marketing Supply and Logistics
Goodwill [Line Items]
Gain (Loss) on Sale of Assets and Asset Impairment Charges	$ 3.1	$ 4.3

Basis of Presentation and Summary of Significant Accounting Policies (Revenue Recognition) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2020	Jan. 01, 2018
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment	$ 3,759.6	$ 3,612.5
Revenues	2,254.3	3,181.9	$ 3,654.1
ASC 606 Accounts Receivable	219.9	225.0
Contract with Customer, Asset, Gross, Noncurrent	1.0	1.2
Deferred revenue	10.3	8.8
Contract liabilities	172.2	144.7
Contract with Customer, Liability, Revenue Recognized	11.6
Depreciation, amortization and accretion	237.4	195.8	168.7
Earnings from unconsolidated affiliates, net	32.5	32.8	53.3
Net income (loss)	(15.3)	319.9	67.0
Less: accumulated depreciation	842.5	703.4
Investments in unconsolidated affiliates	943.7	980.4
Accrued expenses and other liabilities	122.0	161.7
Other long-term liabilities	253.3	244.6
Partners' capital	1,043.4	1,320.8
Property, plant and equipment, net	2,917.1	2,909.1
Cumulative Effect, Period of Adoption, Adjustment
Summary Of Significant Accounting Policies [Line Items]
Total CEQP/CMLP partners’ capital				$ (0.7)	$ 7.5
Product
Summary Of Significant Accounting Policies [Line Items]
Revenues	1,820.3	2,755.3	3,309.7
Product and service costs	1,558.8	2,469.7	2,950.5
Service
Summary Of Significant Accounting Policies [Line Items]
Revenues	434.0	426.6	344.4
Product and service costs	20.7	29.8	44.2
Gathering and Processing Segment \| Product
Summary Of Significant Accounting Policies [Line Items]
Revenues	240.2	455.8	670.5
Gathering and Processing Segment \| Service
Summary Of Significant Accounting Policies [Line Items]
Revenues	391.2	380.0	276.1
Marketing Supply and Logistics
Summary Of Significant Accounting Policies [Line Items]
Revenues			2,690.3
Marketing Supply and Logistics \| Product
Summary Of Significant Accounting Policies [Line Items]
Revenues	1,552.8	2,296.6	2,639.2
Marketing Supply and Logistics \| Service
Summary Of Significant Accounting Policies [Line Items]
Revenues	28.5	26.2	50.2
CMLP
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment	4,089.6	3,942.6
Revenues	2,254.3	3,181.9	3,654.1
Deferred revenue	10.3	8.8
Depreciation, amortization and accretion	251.5	209.9	181.4
Earnings from unconsolidated affiliates, net	32.5	32.8	53.3
Net income (loss)	(23.4)	310.6	58.6
Less: accumulated depreciation	1,028.3	875.1
Investments in unconsolidated affiliates	943.7	980.4
Accrued expenses and other liabilities	120.1	160.4
Other long-term liabilities	251.8	238.6
Total CEQP/CMLP partners’ capital	1,805.1	2,099.3
Property, plant and equipment, net	3,061.3	3,067.5
CMLP \| Product
Summary Of Significant Accounting Policies [Line Items]
Revenues	1,820.3	2,755.3	3,309.7
Product and service costs	1,558.8	2,469.7	2,950.5
CMLP \| Service
Summary Of Significant Accounting Policies [Line Items]
Revenues	434.0	426.6	344.4
Product and service costs	20.7	29.8	44.2
CMLP \| Gathering and Processing Segment \| Product
Summary Of Significant Accounting Policies [Line Items]
Revenues	240.2	455.8	670.5
CMLP \| Gathering and Processing Segment \| Service
Summary Of Significant Accounting Policies [Line Items]
Revenues	391.2	380.0	276.1
CMLP \| Marketing Supply and Logistics \| Product
Summary Of Significant Accounting Policies [Line Items]
Revenues	1,552.8	2,296.6	2,639.2
CMLP \| Marketing Supply and Logistics \| Service
Summary Of Significant Accounting Policies [Line Items]
Revenues	28.5	26.2	50.2
Jackalope Gas Gathering Services, LLC
Summary Of Significant Accounting Policies [Line Items]
Earnings from unconsolidated affiliates, net	0.0	3.7	18.1
Investments in unconsolidated affiliates	0.0	0.0
Jackalope Gas Gathering Services, LLC \| Cumulative Effect, Period of Adoption, Adjustment
Summary Of Significant Accounting Policies [Line Items]
Investments in unconsolidated affiliates					$ 9.5
Crestwood Permian Basin Holdings LLC
Summary Of Significant Accounting Policies [Line Items]
Earnings from unconsolidated affiliates, net	(1.0)	(5.8)	$ 4.4
Investments in unconsolidated affiliates	$ 112.1	$ 121.8
Crestwood Permian Basin Holdings LLC \| Cumulative Effect, Period of Adoption, Adjustment
Summary Of Significant Accounting Policies [Line Items]
Investments in unconsolidated affiliates				0.2
Total CEQP/CMLP partners’ capital				$ 0.2

Basis of Presentation and Summary of Significant Accounting Policies (Remaining Performance Obligations) (Details) $ in Millions	Dec. 31, 2020 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligations, amount	$ 159.6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligations, amount	$ 94.2
Revenue, remaining performance obligations, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligations, amount	$ 54.1
Revenue, remaining performance obligations, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligations, amount	$ 8.0
Revenue, remaining performance obligations, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligations, amount	$ 3.3
Revenue, remaining performance obligations, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2037-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligations, expected timing of satisfaction, period	16 years

Basis of Presentation and Summary of Significant Accounting Policies Inventory (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Inventory [Line Items]
Inventory	$ 89.1	$ 53.7
Natural Gas Liquids
Inventory [Line Items]
Inventory	88.0	53.2
Spare Parts
Inventory [Line Items]
Inventory	$ 1.1	$ 0.5

Acquisitions and Divestitures (Acquisition) (Details) - USD ($) $ in Millions		1 Months Ended		12 Months Ended
	Apr. 09, 2019	Apr. 30, 2019	Dec. 31, 2017	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Apr. 08, 2019
Business Acquisition [Line Items]
Proceeds from Noncontrolling Interests			$ 175.0	$ 2.8	$ 235.0	$ 0.0
Goodwill acquired					80.3
Investments in unconsolidated affiliates				943.7	980.4
Gain on acquisition				0.0	209.4	0.0
Revenues				2,254.3	3,181.9	3,654.1
Net income (loss)				(15.3)	319.9	67.0
Revenues					3,202.6	3,729.5
Net income					313.5	45.0
Jackalope Gas Gathering Services, LLC
Business Acquisition [Line Items]
Business Acquisition, Transaction Costs					2.8
Cash	$ 22.5
Other current assets	30.9
Property, plant and equipment	532.9
Intangible assets	306.0
Goodwill acquired	80.3
Current liabilities	(30.4)
Other long-term liabilities	(21.5)
Estimated fair value of 100% interest in Jackalope	920.7
Gain on acquisition	209.4				$ 209.4
Total purchase price	$ 484.6
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life					17 years
Revenues					$ 70.1
Net income (loss)					20.9
CMLP
Business Acquisition [Line Items]
Proceeds from Noncontrolling Interests				2.8	235.0	0.0
Investments in unconsolidated affiliates				943.7	980.4
Gain on acquisition				0.0	209.4	0.0
Revenues				2,254.3	3,181.9	3,654.1
Net income (loss)				(23.4)	310.6	58.6
Revenues					3,202.6	3,729.5
Net income					304.2	$ 36.6
Crestwood Niobrara LLC
Business Acquisition [Line Items]
Proceeds from Noncontrolling Interests		$ 235.0
Crestwood Niobrara LLC \| Williams Partners LP
Business Acquisition [Line Items]
Additional voting interest acquired	50.00%
Business Acquisition, Percentage of Voting Interest After Acquisition	100.00%
Crestwood Niobrara LLC \| Jackalope Gas Gathering Services, LLC
Business Acquisition [Line Items]
Proceeds from Noncontrolling Interests		$ 235.0
Valuation Technique, Discounted Cash Flow
Business Acquisition [Line Items]
Business Combination Discount Rate	12.00%
Jackalope Gas Gathering Services, LLC
Business Acquisition [Line Items]
Equity method ownership percentage	50.00%	50.00%					50.00%
Investments in unconsolidated affiliates				$ 0.0	$ 0.0
Jackalope Gas Gathering Services, LLC \| Jackalope Gas Gathering Services, LLC
Business Acquisition [Line Items]
Investments in unconsolidated affiliates	$ 226.7

Acquisitions and Divestitures (Narrative) (Details) $ in Millions		1 Months Ended	12 Months Ended
	Oct. 01, 2020 USD ($)	Apr. 30, 2020 USD ($) Terminals MMBbls	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Oct. 31, 2018 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property			$ (26.0)	$ (6.2)	$ (28.6)
Customer accounts
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			22 years
Fayetteville
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property			$ 19.9
Fayetteville \| Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Property, Plant and Equipment, Gross, Period Increase (Decrease)	$ 44.4
Asset Retirement Obligation, Period Increase (Decrease)	1.4
Plains All American Pipeline, L.P.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total purchase price		$ 162.0
NGL Storage Capacity \| MMBbls		7
Property, plant and equipment		$ 110.0
Estimated fair value of 100% interest in Jackalope		2.0
Intangible assets		$ 50.0
Liquid Petroleum Gas Terminals \| Terminals		7
Plains All American Pipeline, L.P. \| Customer accounts
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		20 years
West Coast \| Marketing Supply and Logistics
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Consideration						$ 70.5
Gain (Loss) on Sale of Assets and Asset Impairment Charges					$ 26.9
Fayetteville \| Gathering and Processing Segment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Consideration	23.0
Gain (Loss) on Sale of Assets and Asset Impairment Charges	$ 19.9

Certain Balance Sheet Information (Property, Plant And Equipment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 3,759.6	$ 3,612.5
Less: accumulated depreciation	842.5	703.4
Property, plant and equipment, net	2,917.1	2,909.1
Capitalized interests	2.7	14.4	$ 5.0
Crestwood Equity Partners LP
Property, Plant and Equipment [Line Items]
Property, plant and equipment	3,759.6	3,612.5
Less: accumulated depreciation	842.5	703.4
Property, plant and equipment, net	2,917.1	2,909.1
Depreciation	174.8	139.5	123.6
Crestwood Equity Partners LP \| Gathering systems and pipelines and related assets
Property, Plant and Equipment [Line Items]
Property, plant and equipment	1,050.8	1,017.8
Crestwood Equity Partners LP \| Facilities and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment	2,177.9	1,797.7
Crestwood Equity Partners LP \| Buildings, land, rights-of-way, storage rights and easements
Property, Plant and Equipment [Line Items]
Property, plant and equipment	389.0	370.6
Crestwood Equity Partners LP \| Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment	13.9	12.8
Crestwood Equity Partners LP \| Construction in process
Property, Plant and Equipment [Line Items]
Property, plant and equipment	83.6	368.7
Crestwood Equity Partners LP \| Office furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment	31.1	30.0
Crestwood Equity Partners LP \| Finance leases
Property, Plant and Equipment [Line Items]
Property, plant and equipment	13.3	14.9
CMLP
Property, Plant and Equipment [Line Items]
Property, plant and equipment	4,089.6	3,942.6
Less: accumulated depreciation	1,028.3	875.1
Property, plant and equipment, net	3,061.3	3,067.5
Depreciation	188.9	153.5	$ 137.7
CMLP \| Gathering systems and pipelines and related assets
Property, Plant and Equipment [Line Items]
Property, plant and equipment	1,193.6	1,160.6
CMLP \| Facilities and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment	2,363.0	1,982.8
CMLP \| Buildings, land, rights-of-way, storage rights and easements
Property, Plant and Equipment [Line Items]
Property, plant and equipment	392.7	374.3
CMLP \| Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment	12.1	11.1
CMLP \| Construction in process
Property, Plant and Equipment [Line Items]
Property, plant and equipment	83.6	368.7
CMLP \| Office furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment	31.3	30.2
CMLP \| Finance leases
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 13.3	$ 14.9

Certain Balance Sheet Information (Intangible Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	$ 1,126.1	$ 1,076.3
Less: accumulated amortization	331.8	271.1
Total intangible assets, net	794.3	805.2
Customer accounts
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	488.7	438.9
Less: accumulated amortization	158.5	134.4
Gathering systems and pipelines and related assets
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	631.2	631.2
Gathering systems and pipelines and related assets \| Jackalope Gas Gathering Services, LLC
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	49.8
Acquired storage contracts
Finite-Lived Intangible Assets [Line Items]
Less: accumulated amortization	4.7	4.2
Trademarks
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	6.2	6.2
Revenue Contracts
Finite-Lived Intangible Assets [Line Items]
Less: accumulated amortization	168.6	132.5
Crestwood Equity Partners LP
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	60.7	54.6	$ 43.5
CMLP
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	60.7	54.6	$ 42.1
Less: accumulated amortization	$ 331.8	$ 271.1

Certain Balance Sheet Information (Amortization and Interest Expense, Fiscal Year Maturity) (Details) $ in Millions	Dec. 31, 2020 USD ($)
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense, Next Rolling Twelve Months	$ 61.4
Finite-Lived Intangible Assets, Amortization Expense, Rolling Year Two	61.4
Finite-Lived Intangible Assets, Amortization Expense, Rolling Year Three	57.6
Finite-Lived Intangible Assets, Amortization Expense, Rolling Year Four	54.2
Finite-Lived Intangible Assets, Amortization Expense, Rolling Year Five	$ 51.5

Certain Balance Sheet Information (Accrued Expenses and Other Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Apr. 30, 2019	Apr. 09, 2019	Apr. 08, 2019
Accrued Expenses and Other Liabilities [Line Items]
Deferred revenue	$ 10.3	$ 8.8
Accrued expenses and other liabilities	$ 122.0	$ 161.7
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent
CMLP
Accrued Expenses and Other Liabilities [Line Items]
Accrued expenses	$ 46.4	$ 60.3
Accrued property taxes	8.4	6.1
Income tax payable	0.2	0.3
Interest payable	24.9	25.6
Accrued additions to property, plant and equipment	12.3	38.0
Operating leases	14.7	18.1
Finance leases	2.9
Finance leases		3.2
Deferred revenue	10.3	8.8
Accrued expenses and other liabilities	120.1	160.4
Crestwood Equity Partners LP
Accrued Expenses and Other Liabilities [Line Items]
Accrued expenses	48.3	61.6
Accrued property taxes	8.4	6.1
Income tax payable	0.2	0.3
Interest payable	24.9	25.6
Accrued additions to property, plant and equipment	12.3	38.0
Operating leases	14.7	18.1
Finance leases	2.9
Finance leases		3.2
Deferred revenue	10.3	8.8
Accrued expenses and other liabilities	$ 122.0	$ 161.7
Jackalope Gas Gathering Services, LLC
Accrued Expenses and Other Liabilities [Line Items]
Equity method ownership percentage			50.00%	50.00%	50.00%

Certain Balance Sheet Information (Other Long-Term Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Contract liabilities	$ 172.2	$ 144.7
Operating leases	28.5	41.5
Asset retirement obligations	34.1	33.3
Other long-term liabilities	253.3	244.6
CMLP
Other long-term liabilities	251.8	238.6
Other
Other long-term liabilities	18.5	25.1
Other \| CMLP
Other long-term liabilities	$ 17.0	$ 19.1

Asset Retirement Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Net asset retirement obligation at January 1	$ 34.8	$ 28.1
Liabilities acquired	0.3	1.7
Liabilities incurred	0.3	3.4
Liabilities settled	(0.8)	(0.1)
Accretion expense	(1.9)	(1.7)
Asset Retirement Obligation, Other [Line Items]	(1.4)	0.0
Net asset retirement obligation at December 31	35.1	34.8
Current ARO liabilities	$ 1.0	$ 1.5

Investments in Unconsolidated Affiliates Table (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2020	Apr. 30, 2019	Apr. 09, 2019	Apr. 08, 2019
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	$ 943.7	$ 980.4
Earnings from unconsolidated affiliates, net	32.5	32.8	$ 53.3
Distributions	78.4	75.2	103.0
Contributions	9.4	61.3	64.4
Assets, Current	405.9	376.4
Liabilities, Current	377.8	357.8
Revenues	2,254.3	3,181.9	3,654.1
Operating Expenses	567.0	234.8	411.2
Net income (loss)	(15.3)	319.9	67.0
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule of Equity Method Investments [Line Items]
Assets, Current	70.9	78.2
Assets, Noncurrent	2,307.4	2,351.0
Liabilities, Current	37.5	41.2
Liabilities, Noncurrent	235.1	194.7
Members' Equity	2,105.7	2,193.3
Revenues	275.6	283.7	370.5
Operating Expenses	224.9	209.5	242.1
Net income (loss)	$ 50.9	74.6	133.4
Stagecoach Gas Services LLC
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage	50.00%
Investments in unconsolidated affiliates	$ 792.5	814.4
Earnings from unconsolidated affiliates, net	37.8	34.2	29.3
Distributions	59.7	52.3	48.7
Contributions	0.0	2.1	0.0
Difference between carrying amount and underlying equity	51.3
Stagecoach Gas Services LLC \| Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule of Equity Method Investments [Line Items]
Assets, Current	47.4	50.6
Assets, Noncurrent	1,645.5	1,686.3
Liabilities, Current	3.9	3.9
Liabilities, Noncurrent	1.4	1.5
Members' Equity	1,687.6	1,731.5
Revenues	154.3	163.8	171.4
Operating Expenses	78.8	83.6	79.3
Net income (loss)	75.5	80.6	92.1
Crestwood Permian Basin LLC
Schedule of Equity Method Investments [Line Items]
Difference between carrying amount and underlying equity	8.7
Jackalope Gas Gathering Services, LLC
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage					50.00%	50.00%	50.00%
Investments in unconsolidated affiliates	0.0	0.0
Earnings from unconsolidated affiliates, net	0.0	3.7	18.1
Distributions	0.0	11.6	32.4
Amortization		0.1	0.1
Other Equity Method Investments \| Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule of Equity Method Investments [Line Items]
Assets, Current	23.5	27.6
Assets, Noncurrent	661.9	664.7
Liabilities, Current	33.6	37.3
Liabilities, Noncurrent	233.7	193.2
Members' Equity	418.1	461.8
Revenues	31.6	55.1	116.9
Operating Expenses	53.4	49.9	81.5
Net income (loss)	$ (22.0)	5.1	35.6
Crestwood Permian Basin Holdings LLC
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage	50.00%			50.00%
Investments in unconsolidated affiliates	$ 112.1	121.8
Earnings from unconsolidated affiliates, net	(1.0)	(5.8)	4.4
Distributions	11.9	5.0	14.7
Contributions	3.4	28.3	12.6
Crestwood Permian Basin Holdings LLC \| Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule of Equity Method Investments [Line Items]
Revenues	89.7	64.8	82.2
Operating Expenses	92.7	76.0	81.3
Net income (loss)	$ (2.6)	(11.1)	5.7
Tres Palacios Holdings LLC
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage	50.01%
Investments in unconsolidated affiliates	$ 35.5	35.9
Earnings from unconsolidated affiliates, net	0.0	0.9	0.0
Distributions	6.4	6.3	5.3
Contributions	6.0	6.3	2.5
Difference between carrying amount and underlying equity	22.7
Amortization	$ 1.3	1.3	1.3
Powder River Basin Industrial Complex, LLC
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage	50.01%
Investments in unconsolidated affiliates	$ 3.6	8.3
Earnings from unconsolidated affiliates, net	(4.3)	(0.2)	1.5
Distributions	0.4	0.0	1.9
Contributions	0.0	0.2	0.2
Difference between carrying amount and underlying equity	5.5
Amortization		0.4	0.5
Crestwood Niobrara LLC \| Jackalope Gas Gathering Services, LLC
Schedule of Equity Method Investments [Line Items]
Contributions	$ 0.0	$ 24.4	$ 49.1
Crestwood Niobrara LLC \| Williams Partners LP
Schedule of Equity Method Investments [Line Items]
Additional voting interest acquired						50.00%

Investments in Unconsolidated Affiliates - Narrative (Details) - USD ($)	1 Months Ended	12 Months Ended
	Jan. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2020	Apr. 30, 2019	Apr. 09, 2019	Apr. 08, 2019
Schedule of Equity Method Investments [Line Items]
Contributions		$ 9,400,000	$ 61,300,000	$ 64,400,000
Investments in unconsolidated affiliates		943,700,000	980,400,000
Contingent consideration		38,000,000.0	57,000,000.0
Earnings from unconsolidated affiliates, net		32,500,000	32,800,000	53,300,000
Net proceeds from sale of assets		27,300,000	800,000	79,500,000
Distributions		78,400,000	75,200,000	103,000,000.0
Contingent consideration - current		19,000,000.0	0
Jackalope Gas Gathering Services, LLC
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates		0	0
Earnings from unconsolidated affiliates, net		0	3,700,000	18,100,000
Amortization			100,000	100,000
Equity method ownership percentage						50.00%	50.00%	50.00%
Distributions		0	11,600,000	32,400,000
Tres Palacios Holdings LLC
Schedule of Equity Method Investments [Line Items]
Contributions		6,000,000.0	6,300,000	2,500,000
Investments in unconsolidated affiliates		35,500,000	35,900,000
Earnings from unconsolidated affiliates, net		0	900,000	0
Difference between carrying amount and underlying equity		22,700,000
Amortization		$ 1,300,000	1,300,000	1,300,000
Equity method ownership percentage		50.01%
Distributions		$ 6,400,000	6,300,000	5,300,000
Tres Palacios Holdings LLC \| Subsequent Event
Schedule of Equity Method Investments [Line Items]
Contributions	$ 6,900,000
Powder River Basin Industrial Complex, LLC
Schedule of Equity Method Investments [Line Items]
Contributions		0	200,000	200,000
Investments in unconsolidated affiliates		3,600,000	8,300,000
Earnings from unconsolidated affiliates, net		(4,300,000)	(200,000)	1,500,000
Difference between carrying amount and underlying equity		$ 5,500,000
Amortization			400,000	500,000
Equity method ownership percentage		50.01%
Distributions		$ 400,000	0	1,900,000
Crestwood Permian Basin Holdings \| Subsequent Event
Schedule of Equity Method Investments [Line Items]
Distributions	3,300,000
Crestwood Permian Basin LLC
Schedule of Equity Method Investments [Line Items]
Difference between carrying amount and underlying equity		8,700,000
Stagecoach Gas Services LLC
Schedule of Equity Method Investments [Line Items]
Contributions		0	2,100,000	0
Investments in unconsolidated affiliates		792,500,000	814,400,000
Earnings from unconsolidated affiliates, net		37,800,000	34,200,000	29,300,000
Difference between carrying amount and underlying equity		$ 51,300,000
Equity method ownership percentage		50.00%
Distributions		$ 59,700,000	52,300,000	48,700,000
Business Combination, Contingent Consideration, Liability		57,000,000
Contingent consideration - current		19,000,000
Stagecoach Gas Services LLC \| Subsequent Event
Schedule of Equity Method Investments [Line Items]
Distributions	14,000,000.0
Crestwood Permian Basin Holdings LLC
Schedule of Equity Method Investments [Line Items]
Contributions		3,400,000	28,300,000	12,600,000
Investments in unconsolidated affiliates		112,100,000	121,800,000
Earnings from unconsolidated affiliates, net		$ (1,000,000.0)	(5,800,000)	4,400,000
Equity method ownership percentage		50.00%			50.00%
Distributions		$ 11,900,000	5,000,000.0	14,700,000
Guarantee to third party amount		10,000,000
Crestwood Permian Basin Holdings LLC \| Subsequent Event
Schedule of Equity Method Investments [Line Items]
Contributions	$ 3,300,000
Crestwood Niobrara LLC
Schedule of Equity Method Investments [Line Items]
Percentage of voting interests acquired							100.00%
Crestwood Niobrara LLC \| Jackalope Gas Gathering Services, LLC
Schedule of Equity Method Investments [Line Items]
Contributions		0	24,400,000	$ 49,100,000
Crestwood Equity Partners LP \| Crestwood Permian Basin Holdings LLC
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage				50.00%
CMLP
Schedule of Equity Method Investments [Line Items]
Contributions		9,400,000	61,300,000	$ 64,400,000
Investments in unconsolidated affiliates		943,700,000	980,400,000
Contingent consideration		38,000,000.0	57,000,000.0
Earnings from unconsolidated affiliates, net		32,500,000	32,800,000	53,300,000
Net proceeds from sale of assets		27,300,000	800,000	$ 79,500,000
Contingent consideration - current		$ 19,000,000.0	$ 0
First Reserve Management, L.P. \| Crestwood Permian Basin Holdings LLC
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage				50.00%
Williams Partners LP \| Crestwood Niobrara LLC
Schedule of Equity Method Investments [Line Items]
Additional voting interest acquired							50.00%
Business Acquisition, Percentage of Voting Interest After Acquisition							100.00%

Risk Management (Notional Amounts and Terms of Company's Derivative Financial Instruments) (Details) bcf in Millions, MMBbls in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) MMBbls bcf	Dec. 31, 2019 USD ($) MMBbls bcf	Dec. 31, 2018 USD ($)
Derivative [Line Items]
Product revenues	$ 214.3	$ 252.3	$ 343.3
Cash collateral received, net	12.4	16.9
Commodity Contract With Credit Contingent Features
Derivative [Line Items]
Aggregate fair value of commodity derivative instruments	38.5	1.6
NYMEX-related net derivative asset (liability) position
Derivative [Line Items]
Derivative Liability		(28.8)
Derivative Asset	35.9
NYMEX-related cash collateral (received) posted
Derivative [Line Items]
NYMEX margin deposit		40.4
NYMEX -Related Cash Collateral Received	(18.3)
Commodity Contract
Derivative [Line Items]
Gain (loss) reflected in costs of product/services sold	(20.7)	19.5	$ 29.6
Cash collateral received, net	$ 0.1	$ 0.1
Propane, ethane, butane, heating oil and crude oil (MMBbls) \| Fixed Price Payor
Derivative [Line Items]
Notional amount \| MMBbls	72.7	33.5
Propane, ethane, butane, heating oil and crude oil (MMBbls) \| Fixed Price Receiver
Derivative [Line Items]
Notional amount \| MMBbls	76.5	36.6
Natural gas (Bcf) \| Fixed Price Payor
Derivative [Line Items]
Notional amount \| bcf	22.6	3.7
Natural gas (Bcf) \| Fixed Price Receiver
Derivative [Line Items]
Notional amount \| bcf	28.6	8.7

Risk Management (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Cash collateral received, net	$ 12.4	$ 16.9
Price Risk Contracts \| Maximum
Derivative [Line Items]
Remaining maturity	36 months
Percent of contracts expiring in next twelve months	86.00%
Commodity Contract
Derivative [Line Items]
Gain (loss) reflected in costs of product/services sold	$ (20.7)	19.5	$ 29.6
Cash collateral received, net	$ 0.1	$ 0.1

Fair Value Measurements (Schedule of Carrying Values and Estimated Fair Values of Senior Notes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Unrealized Gain (Loss) on Investments	$ 1.0
Senior Notes, 2023 [Member] \| Crestwood Midstream Senior Notes
Debt Instrument [Line Items]
Senior Notes	687.2	$ 700.0
Senior Notes, 2023 [Member] \| CMLP \| Crestwood Midstream Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Fair Value Disclosure	691.5	714.0
Senior Notes	683.8	695.1
Senior Notes, 2025 [Member] \| Crestwood Midstream Senior Notes
Debt Instrument [Line Items]
Senior Notes	500.0	500.0
Senior Notes, 2025 [Member] \| CMLP \| Crestwood Midstream Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Fair Value Disclosure	509.9	514.4
Senior Notes	495.5	494.4
Senior Notes, due 2027 [Member] \| CMLP
Debt Instrument [Line Items]
Debt Instrument, Fair Value Disclosure	594.1	610.1
Senior Notes	$ 593.2	$ 592.1

Fair Value Measurements (Assets And Liabilities Measured At Fair Value On Recurring Basis) (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Assets, Fair Value Disclosure [Abstract]
Assets from price risk management	$ 500.7	$ 167.7
SPH units	2.1	3.1
Assets, Fair Value Disclosure, Excluding Netting Adjustments	502.8	170.8
Netting Agreements	(455.0)	(122.3)
Derivative Asset, Fair Value of Collateral	(18.5)	(2.2)
Assets from price risk management, Total	27.2	43.2
Total assets at fair value	29.3	46.3
Liabilities, Fair Value Disclosure [Abstract]
Liabilities from price risk management	519.1	154.7
Liabilities, Fair Value Disclosure, Excluding Netting Adjustments	519.1	154.7
Netting Agreements	(455.0)	(122.3)
Derivative Liability, Fair Value of Collateral	(12.2)	(25.7)
Liabilities from price risk management, Total	76.3	6.7
Total liabilities at fair value		6.7
Level 1
Assets, Fair Value Disclosure [Abstract]
Assets from price risk management	20.2	3.7
SPH units	2.1	3.1
Assets, Fair Value Disclosure, Excluding Netting Adjustments	22.3	6.8
Liabilities, Fair Value Disclosure [Abstract]
Liabilities from price risk management	25.1	2.8
Liabilities, Fair Value Disclosure, Excluding Netting Adjustments	25.1	2.8
Level 2
Assets, Fair Value Disclosure [Abstract]
Assets from price risk management	480.5	164.0
SPH units	0.0	0.0
Assets, Fair Value Disclosure, Excluding Netting Adjustments	480.5	164.0
Liabilities, Fair Value Disclosure [Abstract]
Liabilities from price risk management	494.0	151.9
Liabilities, Fair Value Disclosure, Excluding Netting Adjustments	494.0	151.9
Level 3
Assets, Fair Value Disclosure [Abstract]
Assets from price risk management	0.0	0.0
SPH units	0.0	0.0
Assets, Fair Value Disclosure, Excluding Netting Adjustments	0.0	0.0
Liabilities, Fair Value Disclosure [Abstract]
Liabilities from price risk management	0.0	0.0
Liabilities, Fair Value Disclosure, Excluding Netting Adjustments	$ 0.0	$ 0.0

Long-Term Debt (Components Of Long-Term Debt) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Apr. 30, 2019
Debt Instrument [Line Items]
Obligations under noncompetition agreements and notes to former owners of businesses acquired	$ 0.4	$ 0.6
Debt Issuance Costs, Net	22.6	29.1
Debt, Long-term and Short-term, Combined Amount	2,484.0	2,328.5
Less: current portion	0.2	0.2
Total long-term debt	2,483.8	2,328.3
Crestwood Midstream Revolver \| Revolving Credit Facility
Debt Instrument [Line Items]
Credit agreement outstanding carrying value	719.0	557.0
Senior Notes, 2023 [Member] \| Crestwood Midstream 2022 senior unsecured notes
Debt Instrument [Line Items]
Senior Notes	687.2	700.0
Senior Notes, 2025 [Member] \| Crestwood Midstream 2022 senior unsecured notes
Debt Instrument [Line Items]
Senior Notes	500.0	500.0
Senior Notes, due 2027 [Member] \| Crestwood Midstream 2019 Senior Notes
Debt Instrument [Line Items]
Senior Notes	$ 600.0	$ 600.0	$ 600.0

Long-Term Debt (Narrative) (Details) - USD ($)	1 Months Ended		12 Months Ended
Long-Term Debt (Narrative) (Details) - USD ($)	Jan. 31, 2021	Apr. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Apr. 09, 2019	Apr. 08, 2019
Debt Instrument [Line Items]
Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries			$ 1,805,100,000
Gains (Losses) on Extinguishment of Debt			100,000	$ 0	$ (900,000)
Debt Issuance Costs, Net			22,600,000	29,100,000
Subsequent Event
Debt Instrument [Line Items]
Extinguishment of Debt, Amount	$ 399,200,000
CMLP
Debt Instrument [Line Items]
Gains (Losses) on Extinguishment of Debt			$ 100,000	0	$ (900,000)
Revolving Loan Facility \| CMLP
Debt Instrument [Line Items]
Debt Instrument, Term			5 years
Credit agreement outstanding carrying value			$ 1,250,000,000
Senior Notes, 2023 [Member]
Debt Instrument [Line Items]
Repayments of Senior Debt			12,600,000
Extinguishment of Debt, Amount			$ 12,800,000
Senior Notes, 2023 [Member] \| Crestwood Midstream 2019 Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage			6.25%
Senior Notes, 2023 [Member] \| Crestwood Midstream 2022 senior unsecured notes
Debt Instrument [Line Items]
Carrying amount			$ 687,200,000	700,000,000.0
Senior Notes, 2023 [Member] \| Crestwood Midstream 2022 senior unsecured notes \| CMLP
Debt Instrument [Line Items]
Carrying amount			$ 683,800,000	695,100,000
Senior Notes, 2025 [Member] \| Crestwood Midstream 2019 Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage			5.75%
Senior Notes, 2025 [Member] \| Crestwood Midstream 2022 senior unsecured notes
Debt Instrument [Line Items]
Carrying amount			$ 500,000,000.0	500,000,000.0
Senior Notes, 2025 [Member] \| Crestwood Midstream 2022 senior unsecured notes \| CMLP
Debt Instrument [Line Items]
Carrying amount			495,500,000	494,400,000
Senior Notes, due 2027 [Member] \| CMLP
Debt Instrument [Line Items]
Carrying amount			593,200,000	592,100,000
Senior Notes, due 2027 [Member] \| Crestwood Midstream 2019 Senior Notes
Debt Instrument [Line Items]
Carrying amount		$ 600,000,000	600,000,000.0	600,000,000.0
Interest rate, stated percentage		5.625%
Senior Notes, due 2027 [Member] \| Crestwood Midstream 2019 Senior Notes \| CMLP
Debt Instrument [Line Items]
Proceeds from Issuance of Debt		$ 591,100,000
Crestwood Midstream Credit Facility
Debt Instrument [Line Items]
Line of Credit Facility, Additional Potential Capacity			350,000,000.0
Line of Credit Facility, Current Borrowing Capacity			350,000,000.0
Crestwood Midstream Credit Facility \| Minimum
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Amount			0.0025
Crestwood Midstream Credit Facility \| Maximum
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Amount			$ 0.0045
Crestwood Midstream Revolver
Debt Instrument [Line Items]
Consolidated leverage ratio, maximum			5.50
Crestwood Midstream Revolver \| Revolving Credit Facility
Debt Instrument [Line Items]
Credit agreement outstanding carrying value			$ 719,000,000.0	557,000,000.0
Letters of credit outstanding			$ 23,900,000	$ 31,700,000
Total funded debt to consolidated EBITDA			4.02
Consolidated EBITDA to consolidated interest expense			4.77
Senior Secured Leverage Ratio			1.15
Weighted average interest rate			2.45%	4.00%
Unused borrowing capacity			$ 507,100,000
Interest coverage ratio, minimum			2.50
Senior Secured Leverage Ratio, maximum			3.75
Line of Credit Facility, Increase (Decrease), Net		$ 250,000,000
Crestwood Midstream Revolver \| Revolving Credit Facility \| Minimum
Debt Instrument [Line Items]
Weighted average interest rate			2.40%	3.96%
Crestwood Midstream Revolver \| Revolving Credit Facility \| Maximum
Debt Instrument [Line Items]
Weighted average interest rate			4.50%	6.00%
Crestwood Midstream Revolver \| Bridge Loan
Debt Instrument [Line Items]
Credit agreement outstanding carrying value			$ 25,000,000.0
Senior Notes, due 2029 \| Crestwood Midstream 2019 Senior Notes \| Subsequent Event
Debt Instrument [Line Items]
Carrying amount	$ 700,000,000
Interest rate, stated percentage	6.00%
Federal Funds Rate \| Revolving Credit Facility \| Crestwood Midstream Revolver
Debt Instrument [Line Items]
Variable interest rate			0.50%
Eurodollar [Member] \| Revolving Credit Facility \| Crestwood Midstream Credit Facility \| Minimum
Debt Instrument [Line Items]
Variable interest rate			1.50%
Eurodollar [Member] \| Revolving Credit Facility \| Crestwood Midstream Credit Facility \| Maximum
Debt Instrument [Line Items]
Variable interest rate			2.50%
Eurodollar [Member] \| Revolving Credit Facility \| Crestwood Midstream Revolver
Debt Instrument [Line Items]
Variable interest rate			1.00%
Eurodollar [Member] \| Revolving Credit Facility \| Crestwood Midstream Revolver \| Minimum
Debt Instrument [Line Items]
Variable interest rate			0.50%
Eurodollar [Member] \| Revolving Credit Facility \| Crestwood Midstream Revolver \| Maximum
Debt Instrument [Line Items]
Variable interest rate			1.50%
Jackalope Gas Gathering Services, LLC
Debt Instrument [Line Items]
Equity Interest		50.00%	50.00%
Equity method ownership percentage		50.00%				50.00%	50.00%
Stagecoach Gas Services LLC
Debt Instrument [Line Items]
Equity method ownership percentage			50.00%

Long-Term Debt (Maturities of Long Term Debt) (Details) - CMLP $ in Millions	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
2019	$ 0.2
2020	0.2
2021	1,406.2
2022	0.0
2023	500.0
Thereafter	600.0
Total debt	$ 2,506.6

Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Loss Contingency, Damages Sought, Value	$ 55.0
Loss Contingency Accrual, at Carrying Value	10.4	$ 10.7
Accrual for Environmental Loss Contingencies	1.3	6.7
Purchase Commitment, Remaining Minimum Amount	1,398.2
Loss Contingency, Damages Paid, Value	2.3
Other Growth and Maintenance Contractual Purchase Obligations
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Firm Purchase Commitments	24.4
Commodity
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Firm Purchase Commitments	1,598.8
Crestwood Equity Partners LP
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Self-insurance reserves	7.7	9.7
Self-insurance reserve expected to be paid in next fiscal year	4.8
CMLP
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Self-insurance reserves	6.7	$ 8.3
Self-insurance reserve expected to be paid in next fiscal year	4.1
Maximum
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Loss Contingency, Estimate of Possible Loss	$ 2.1

Commitments and Contingencies Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Total costs of products/services sold	$ 1,600.5	$ 2,544.9	$ 3,129.4
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	16.6
Operating Lease, Payments	21.3	22.9
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	2.1	4.2
Operations and maintenance	131.8	138.8	$ 125.8
Operating Lease, Expense	$ 27.2	$ 28.3
Operating Lease, Weighted Average Remaining Lease Term	4 years 3 months 18 days	4 years 4 months 24 days
Operating lease right-of-use assets, net	$ 36.8	$ 53.8
Accrued expenses and other liabilities	122.0	161.7
Operating leases	28.5	41.5
Operating Lease, Liability	43.2
Property, plant and equipment	3,759.6	3,612.5
Less: accumulated depreciation	842.5	703.4
Property, plant and equipment, net	2,917.1	2,909.1
Other long-term liabilities	253.3	244.6
Finance Lease, Liability	$ 4.8	$ 8.4
Finance Lease, Weighted Average Remaining Lease Term	1 year 8 months 12 days	2 years 7 months 6 days
Operating Lease, Weighted Average Discount Rate, Percent	6.20%	5.90%
Finance Lease, Weighted Average Discount Rate, Percent	7.30%	7.30%
Sublease Income	$ (1.7)	$ (1.0)
Operating Lease Expense, Net	25.5	27.3
Finance Lease, Right-of-Use Asset, Amortization	3.5	3.6
Finance Lease, Interest Expense	0.5	0.7
Finance Lease Expense	4.0	4.3
Finance Lease, Interest Payment on Liability	0.5	0.7
Payments on finance leases	3.1	3.5
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	0.4	1.8
Finance Lease, Liability, Payments, Due Next Twelve Months	3.2
Operating and Finance Lease Liability, Due Next Twelve Months	19.8
Lessee, Operating Lease, Liability, Payments, Due Year Two	11.3
Finance Lease, Liability, Payments, Due Year Two	1.8
Operating and Finance Lease Liability Payments, Due Year Two	13.1
Lessee, Operating Lease, Liability, Payments, Due Year Three	7.0
Finance Lease, Liability, Payments, Due Year Three	0.1
Operating and Finance Lease Liability Payments, Due Year Three	7.1
Lessee, Operating Lease, Liability, Payments, Due Year Four	6.3
Finance Lease, Liability, Payments, Due Year Four	0.0
Operating and Finance Lease Liability Payments, Due Year Four	6.3
Lessee, Operating Lease, Liability, Payments, Due Year Five	3.2
Finance Lease, Liability, Payments, Due Year Five	0.0
Operating and Finance Lease Liability Payments, Due Year Five	3.2
Lessee, Operating Lease, Liability, Payments, Due after Year Five	5.0
Finance Lease, Liability, Payments, Due after Year Five	0.0
Operating and Finance Lease Liability Payments, Due after Year Five	5.0
Lessee, Operating Lease, Liability, Payments, Due	49.4
Finance Lease, Liability, Payment, Due	5.1
Operating and Finance Lease Liability, Payments, Due	54.5
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	6.2
Finance Lease, Liability, Undiscounted Excess Amount	0.3
Operating and Finance Lease Liability, Undiscounted Excess Amount	6.5
Operating and Finance Lease Liability	48.0
Operating Leases [Member]
Lessee, Lease, Description [Line Items]
Total costs of products/services sold	17.6	17.5
Operations and maintenance	6.7	8.0
Operating lease right-of-use assets, net	36.8	53.8
Accrued expenses and other liabilities	14.7	18.1
Operating leases	28.5	41.5
Operating Lease, Liability	43.2	59.6
Finance Lease [Member]
Lessee, Lease, Description [Line Items]
Accrued expenses and other liabilities	2.9	3.2
Property, plant and equipment	13.3	14.9
Less: accumulated depreciation	7.9	5.4
Property, plant and equipment, net	5.4	9.5
Other long-term liabilities	$ 1.9	$ 5.2
Minimum
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Renewal Term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Renewal Term	10 years

Leases (Details) - USD ($) $ in Millions	12 Months Ended
Leases (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Operating Lease, Expense	$ 27.2	$ 28.3
Sublease Income	(1.7)	(1.0)
Operating Lease Expense, Net	25.5	27.3
Finance Lease, Right-of-Use Asset, Amortization	3.5	3.6
Finance Lease, Interest Expense	0.5	0.7
Finance Lease Expense	4.0	4.3
Operations and maintenance	131.8	138.8	$ 125.8
Total costs of products/services sold	1,600.5	2,544.9	3,129.4
Operating Lease, Payments	21.3	22.9
Finance Lease, Interest Payment on Liability	0.5	0.7
Payments on finance leases	3.1	3.5
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	2.1	4.2
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	0.4	1.8
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	16.6
Finance Lease, Liability, Payments, Due Next Twelve Months	3.2
Operating and Finance Lease Liability, Due Next Twelve Months	19.8
Lessee, Operating Lease, Liability, Payments, Due Year Two	11.3
Finance Lease, Liability, Payments, Due Year Two	1.8
Operating and Finance Lease Liability Payments, Due Year Two	13.1
Lessee, Operating Lease, Liability, Payments, Due Year Three	7.0
Finance Lease, Liability, Payments, Due Year Three	0.1
Operating and Finance Lease Liability Payments, Due Year Three	7.1
Lessee, Operating Lease, Liability, Payments, Due Year Four	6.3
Finance Lease, Liability, Payments, Due Year Four	0.0
Operating and Finance Lease Liability Payments, Due Year Four	6.3
Lessee, Operating Lease, Liability, Payments, Due Year Five	3.2
Finance Lease, Liability, Payments, Due Year Five	0.0
Operating and Finance Lease Liability Payments, Due Year Five	3.2
Lessee, Operating Lease, Liability, Payments, Due after Year Five	5.0
Finance Lease, Liability, Payments, Due after Year Five	0.0
Operating and Finance Lease Liability Payments, Due after Year Five	5.0
Lessee, Operating Lease, Liability, Payments, Due	49.4
Finance Lease, Liability, Payment, Due	5.1
Operating and Finance Lease Liability, Payments, Due	54.5
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	6.2
Finance Lease, Liability, Undiscounted Excess Amount	0.3
Operating and Finance Lease Liability, Undiscounted Excess Amount	6.5
Operating Lease, Liability	43.2
Finance Lease, Liability	4.8	8.4
Operating and Finance Lease Liability	48.0
Operating lease right-of-use assets, net	36.8	53.8
Accrued expenses and other liabilities	$ 122.0	$ 161.7
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:LiabilitiesNoncurrentAbstract	us-gaap:LiabilitiesNoncurrentAbstract
Operating leases	$ 28.5	$ 41.5
Property, plant and equipment	3,759.6	3,612.5
Less: accumulated depreciation	842.5	703.4
Property, plant and equipment, net	2,917.1	2,909.1
Other long-term liabilities	$ 253.3	$ 244.6
Operating Lease, Weighted Average Remaining Lease Term	4 years 3 months 18 days	4 years 4 months 24 days
Finance Lease, Weighted Average Remaining Lease Term	1 year 8 months 12 days	2 years 7 months 6 days
Operating Lease, Weighted Average Discount Rate, Percent	6.20%	5.90%
Finance Lease, Weighted Average Discount Rate, Percent	7.30%	7.30%
General and administrative	$ 91.5	$ 103.4	$ 88.1
Short-term Lease, Cost	$ 5.5	$ 3.7
Maximum
Lessee, Lease, Description [Line Items]
Lessee, Finance Lease, Remaining Term Of Contract	4 years
Lessee, Operating Lease, Remaining Term Of Contract	19 years
Lessee, Operating and Finance Leases, Discount Rate	12.80%	8.30%
Minimum
Lessee, Lease, Description [Line Items]
Lessee, Finance Lease, Remaining Term Of Contract	1 year
Lessee, Operating Lease, Remaining Term Of Contract	1 year
Lessee, Operating and Finance Leases, Discount Rate	2.60%	3.50%
Operating Leases [Member]
Lessee, Lease, Description [Line Items]
Operations and maintenance	$ 6.7	$ 8.0
Total costs of products/services sold	17.6	17.5
Operating Lease, Liability	43.2	59.6
Operating lease right-of-use assets, net	36.8	53.8
Accrued expenses and other liabilities	14.7	18.1
Operating leases	28.5	41.5
General and administrative	$ 2.9	$ 2.8

Partners' Capital and Non-Controlling Partner (Schedule of Issuance of Units) (Details) - shares	Dec. 31, 2020	Dec. 31, 2019
Partners' Capital [Abstract]
Units	73,970,208	72,282,942

Partners' Capital and Non-Controlling Partner (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions																											1 Months Ended			12 Months Ended
	Feb. 12, 2021	Feb. 05, 2021	Nov. 13, 2020	Nov. 06, 2020	Aug. 14, 2020	Aug. 07, 2020	May 15, 2020	May 08, 2020	Feb. 14, 2020	Feb. 07, 2020	Nov. 14, 2019	Nov. 07, 2019	Aug. 14, 2019	Aug. 07, 2019	May 15, 2019	May 08, 2019	Feb. 14, 2019	Feb. 07, 2019	Nov. 14, 2018	Nov. 07, 2018	Aug. 14, 2018	Aug. 07, 2018	May 15, 2018	May 08, 2018	Feb. 14, 2018	Feb. 07, 2018	Jan. 31, 2021	Apr. 30, 2019	Dec. 31, 2017	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Apr. 09, 2019	Apr. 08, 2019
Distribution Made to Member or Limited Partner [Line Items]
Distribution to limited partner, distribution date			Nov. 13, 2020		Aug. 14, 2020		May 15, 2020		Feb. 14, 2020		Nov. 14, 2019		Aug. 14, 2019		May 15, 2019		Feb. 14, 2019		Nov. 14, 2018		Aug. 14, 2018		May 15, 2018		Feb. 14, 2018
Maximum Period For Distribution Of Available Cash																														45 days
Per unit rate, in dollars per unit			$ 0.625		$ 0.625		$ 0.625		$ 0.625		$ 0.60		$ 0.60		$ 0.60		$ 0.60		$ 0.60		$ 0.60		$ 0.60		$ 0.60
Distributions to partners																														$ (182.7)	$ (172.4)	$ (170.8)
Contributions																														9.4	61.3	64.4
Distributions paid to non-controlling partners																														$ 37.1	$ 25.0	9.9
Limited partners' units, issued																														73,970,208	72,282,942
Preferred units, outstanding (in units)																														71,257,445	71,257,445
Preferred units, issued																														71,257,445	71,257,445
Distributions to preferred unitholders																														$ 60.1	$ 60.1	60.1
Distribution to limited partner, record date				Nov. 06, 2020		Aug. 07, 2020		May 08, 2020		Feb. 07, 2020		Nov. 07, 2019		Aug. 07, 2019		May 08, 2019		Feb. 07, 2019		Nov. 07, 2018		Aug. 07, 2018		May 08, 2018		Feb. 07, 2018
Proceeds from Noncontrolling Interests																													$ 175.0	2.8	235.0	0.0
Maximum Value of Common Units to be Issued Under Optional Redemption																														100.0
Subsequent Event
Distribution Made to Member or Limited Partner [Line Items]
Distributions to preferred unitholders	$ 15.0
Crestwood Niobrara LLC
Distribution Made to Member or Limited Partner [Line Items]
Proceeds from Noncontrolling Interests																												$ 235.0
Crestwood Niobrara LLC \| Cash distribution
Distribution Made to Member or Limited Partner [Line Items]
Distributions paid to non-controlling partners																														37.1	25.0	9.9
Crestwood Niobrara LLC \| Subsequent Event \| Cash distribution
Distribution Made to Member or Limited Partner [Line Items]
Distributions paid to non-controlling partners																											$ 9.3
CMLP
Distribution Made to Member or Limited Partner [Line Items]
Distributions to partners																														(242.6)	(235.8)	(238.4)
Contributions																														9.4	61.3	64.4
Distributions paid to non-controlling partners																														37.1	25.0	9.9
Distribution Made to General Partner, Cash Distributions Paid																														242.6	235.8	238.4
Proceeds from Noncontrolling Interests																														2.8	235.0	0.0
Tres Palacios Holdings LLC
Distribution Made to Member or Limited Partner [Line Items]
Contributions																														$ 6.0	6.3	2.5
Equity method ownership percentage																														50.01%
Tres Palacios Holdings LLC \| Subsequent Event
Distribution Made to Member or Limited Partner [Line Items]
Contributions																											$ 6.9
Jackalope Gas Gathering Services, LLC
Distribution Made to Member or Limited Partner [Line Items]
Equity method ownership percentage																												50.00%					50.00%	50.00%
Equity Interest																												50.00%		50.00%
Jackalope Gas Gathering Services, LLC \| Crestwood Niobrara LLC
Distribution Made to Member or Limited Partner [Line Items]
Contributions																														$ 0.0	$ 24.4	$ 49.1
Cash distribution \| Subsequent Event
Distribution Made to Member or Limited Partner [Line Items]
Distribution declared per limited partner unit	$ 0.625
Distribution to limited partner, record date		Feb. 05, 2021
Preferred Partner
Distribution Made to Member or Limited Partner [Line Items]
Partners' Capital, Distribution Amount Per Share																														$ 0.2567
Partners' Capital, Contingent Distribution Amount Per Share																														$ 0.2111
Partner's Capital, Unpaid Distribution, Accrual Percentage																														2.8125%
Subordinated Unit \| Limited Partners
Distribution Made to Member or Limited Partner [Line Items]
Limited partners' units, issued																																438,789
Partners' Capital Account, Units, Cash Distribution Threshold, Quarterly Distribution																														$ 1.30
Partners' Capital Account, Units, Conversion Threshold, Cumulative Distribution																														$ 5.20
Williams Partners LP \| Crestwood Niobrara LLC
Distribution Made to Member or Limited Partner [Line Items]
Additional voting interest acquired																																	50.00%

Partners' Capital and Non-Controlling Partner (Schedule of Partnership Distributions) (Details) - USD ($) $ / shares in Units, $ in Millions																											12 Months Ended
	Feb. 12, 2021	Feb. 05, 2021	Nov. 13, 2020	Nov. 06, 2020	Aug. 14, 2020	Aug. 07, 2020	May 15, 2020	May 08, 2020	Feb. 14, 2020	Feb. 07, 2020	Nov. 14, 2019	Nov. 07, 2019	Aug. 14, 2019	Aug. 07, 2019	May 15, 2019	May 08, 2019	Feb. 14, 2019	Feb. 07, 2019	Nov. 14, 2018	Nov. 07, 2018	Aug. 14, 2018	Aug. 07, 2018	May 15, 2018	May 08, 2018	Feb. 14, 2018	Feb. 07, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure Partners Capital Summary Of Quarterly Distributions Of Available Cash [Abstract]
Distribution to limited partner, record date				Nov. 06, 2020		Aug. 07, 2020		May 08, 2020		Feb. 07, 2020		Nov. 07, 2019		Aug. 07, 2019		May 08, 2019		Feb. 07, 2019		Nov. 07, 2018		Aug. 07, 2018		May 08, 2018		Feb. 07, 2018
Distribution to limited partner, distribution date			Nov. 13, 2020		Aug. 14, 2020		May 15, 2020		Feb. 14, 2020		Nov. 14, 2019		Aug. 14, 2019		May 15, 2019		Feb. 14, 2019		Nov. 14, 2018		Aug. 14, 2018		May 15, 2018		Feb. 14, 2018
Distribution Made to Limited Partner, Distributions Paid, Per Unit			$ 0.625		$ 0.625		$ 0.625		$ 0.625		$ 0.60		$ 0.60		$ 0.60		$ 0.60		$ 0.60		$ 0.60		$ 0.60		$ 0.60
Distribution amount			$ 46.0		$ 45.7		$ 45.7		$ 45.3		$ 43.1		$ 43.1		$ 43.1		$ 43.1		$ 42.7		$ 42.7		$ 42.7		$ 42.7		$ 182.7	$ 172.4	$ 170.8
Cash distribution \| Subsequent Event
Disclosure Partners Capital Summary Of Quarterly Distributions Of Available Cash [Abstract]
Distribution to limited partner, record date		Feb. 05, 2021
Distribution declared per limited partner unit	$ 0.625

Partners' Capital Net Income (Loss) Attributable to NonControlling Partners (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Limited Partners' Capital Account [Line Items]
Net income (loss) attributable to non-controlling partners in subsidiary	$ 40.8	$ 34.8	$ 16.2
CMLP
Limited Partners' Capital Account [Line Items]
Net income (loss) attributable to non-controlling partners in subsidiary	$ 40.8	$ 34.8	$ 16.2

Partners' Capital Rollforward of non-controlling interest (Details) - USD ($)	1 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Temporary Equity [Line Items]
Interest of non-controlling partner in subsidiary		$ 432,700,000	$ 426,200,000	$ 0
Non-controlling interest reclassification (Note 12)			178,800,000
Proceeds from Noncontrolling Interests	$ 175,000,000	2,800,000	235,000,000.0	$ 0
Temporary Equity, Net Income		40,800,000	30,800,000
Series A-3
Temporary Equity [Line Items]
Proceeds from Noncontrolling Interests			235,000,000.0
Non-Controlling Partner
Temporary Equity [Line Items]
Proceeds from Noncontrolling Interests		2,800,000
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders		$ (37,100,000)	$ (18,400,000)

- Definition

Carrying amount, attributable to parent and noncontrolling interests, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer.

+ References + Details

Equity Plans (Schedule of Phantom and Restricted Unit Activity) (Details) - Crestwood Long-Term Incentive Plan - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested units - December 31, units	2,355,949	2,187,970	1,830,096
Unvested units - December 31	$ 28.94	$ 24.78	$ 25.21
Unvested units - December 31, units	2,723,856	2,355,949	2,187,970
Unvested units - December 31	$ 26.62	$ 28.94	$ 24.78
Restricted units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted, units	1,569,451	988,096	1,144,017
Granted	$ 25.42	$ 31.48	$ 25.80
Vested, units	(906,275)	(985,751)	(617,807)
Vested	$ 28.75	$ 23.39	$ 23.73
Canceled, units	(149,001)	(47,547)	(53,530)
Canceled	$ 28.24	$ 27.85	$ 23.36
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted, units	715,674	238,263	901
Granted	$ 28.46	$ 34.21	$ 25.60
Vested, units	(846,306)	(32,246)	(11,772)
Vested	$ 29.85	$ 34.21	$ 28.87
Canceled, units	(17,087)		(5,870)
Canceled	$ 27.35		$ 30.45
Phantom Share Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted, units	17,726	7,164	7,750
Granted	$ 28.48	$ 29.03	$ 26.10
Vested, units	(2,118)		(105,809)
Vested	$ 26.63		$ 49.45
Canceled, units	(14,157)		(6)
Canceled	$ 27.91		$ 49.45

Equity Plans (Narrative) (Details) - USD ($)	12 Months Ended
Equity Plans (Narrative) (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Feb. 12, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 35,100,000	$ 45,100,000	$ 24,300,000
Employer matching contribution, percent	6.00%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	10.00%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount	$ 25,000
Common Stock, Shares Authorized	1,500,000
Unit Purchase Plan, Shares Purchased Under Plan	29,784	6,341	0
Share-based Payment Arrangement, Nonemployee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	1 year
Restricted units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Phantom Share Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Crestwood Long-Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation costs not yet recognized	$ 29,700,000	$ 34,600,000
Common units to satisfy employee tax withholding obligations	581,608	336,548	221,576
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	3 years
Equity Securities
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 1,400,000	$ 4,600,000
Subsequent Event \| Crestwood Long-Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance				1,230,527
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance multiplier	50.00%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance multiplier	200.00%

Earnings Per Limited Partner Unit (Schedule of Reconciliation of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net Income (Loss) Allocated to Limited Partners	$ (116.2)	$ 223.6	$ (9.3)
Subordinated unitholders’ interest in net income	0.0	1.4	0.0
Net Income (Loss) Available to Common Stockholders, Diluted	$ (116.2)	$ 225.0	$ (9.3)
Basic (units)	73.2	71.8	71.2
Dilutive units (units)	0.0	5.1	0.0
Weighted Average Limited Partnership Units Outstanding, Diluted	73.2	76.9	71.2
Earnings Per Share, Basic	$ (1.59)	$ 3.11	$ (0.13)
Earnings Per Share, Diluted	$ (1.59)	$ 2.93	$ (0.13)
Niobrara Preferred Units [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dilutive units (units)	0.0	4.3	0.0
Preferred Units
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive securities excluded from computation of earnings per share	7.1	7.1	7.1
Subordinated units
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive securities excluded from computation of earnings per share	0.4	0.0	0.4
Dilutive units (units)	0.0	0.4	0.0
Performance Shares
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive securities excluded from computation of earnings per share	0.1	0.0	0.4
Dilutive units (units)	0.0	0.4	0.0
Crestwood Niobrara LLC \| Preferred Units
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive securities excluded from computation of earnings per share	5.7	0.0	6.5

Employee Benefit Plan (Details) - USD ($)	12 Months Ended
Employee Benefit Plan (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Postemployment Benefits [Abstract]
Defined Contribution Plan, Employer Matching Contribution, Percent	90.00%
Defined Benefit Plan, Employee Contributions, Statutory Maximum Per Employee	$ 19,500	$ 19,000	$ 18,500
Defined Contribution Plan Participants Basic Contribution	100.00%
Employer matching contribution, percent	6.00%
Defined Contribution Plan, Requisite Service Period	90 days
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 4,200,000	$ 4,700,000	$ 4,600,000

Segments (Narrative) (Details) $ in Millions	12 Months Ended
Segments (Narrative) (Details) $ in Millions	Dec. 31, 2020 USD ($) segment	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Revenue, Major Customer [Line Items]
Revenues	$ 2,254.3	$ 3,181.9	$ 3,654.1
Number of operating segments \| segment	3
Concentration Risk, Percentage	10.00%	10.00%
Crestwood Equity Partners LP
Revenue, Major Customer [Line Items]
Earnings (Losses) Before Interest, Taxes, Depreciation and Amortization from Equity Method Investments	$ 42.9	$ 42.1	42.3
CMLP
Revenue, Major Customer [Line Items]
Revenues	$ 2,254.3	3,181.9	$ 3,654.1
British Petroleum and its subsidiaries
Revenue, Major Customer [Line Items]
Revenues		$ 333.9

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 40
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(ii))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 235
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-05(b)(2))
-URI http://asc.fasb.org/extlink&oid=120399901&loc=d3e537907-122884

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(1))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

+ Details

Segments (Reconciliation of Net Income (Loss) to EBITDA) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Net income (loss)	$ (15.3)	$ 319.9	$ 67.0
Interest and debt expense, net	(133.6)	(115.4)	(99.2)
(Gain) loss on modification/extinguishment of debt	(0.1)	0.0	0.9
(Provision) benefit for income taxes	0.4	0.3	0.1
Depreciation, amortization and accretion	237.4	195.8	168.7
EBITDA	356.0	631.4	335.9
CMLP
Segment Reporting Information [Line Items]
Net income (loss)	(23.4)	310.6	58.6
Interest and debt expense, net	(133.6)	(115.4)	(99.2)
(Gain) loss on modification/extinguishment of debt	(0.1)	0.0	0.9
(Provision) benefit for income taxes	(0.1)	0.3	0.0
Depreciation, amortization and accretion	251.5	209.9	181.4
EBITDA	$ 361.5	$ 636.2	$ 340.1

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References + Details

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

+ Details

Segments (Summary Of Segment Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2019
Segment Reporting Information [Line Items]
Operating revenues	$ 2,254.3	$ 3,181.9	$ 3,654.1
Costs of product/services sold	1,600.5	2,544.9	3,129.4
Operations and maintenance	131.8	138.8	125.8
General and administrative	91.5	103.4	88.1
Gain (loss) on long-lived assets, net	(26.0)	(6.2)	(28.6)
Goodwill impairment	(80.3)	0.0	0.0
Gain on acquisition	0.0	209.4	0.0
Earnings from unconsolidated affiliates, net	32.5	32.8	53.3
Other income (expense), net	(0.7)	0.6	0.4
EBITDA	356.0	631.4	335.9
Goodwill	138.6	218.9		$ 138.6
Assets	5,243.7	5,349.3
Purchases of property, plant and equipment	168.3	455.5	305.5
CMLP
Segment Reporting Information [Line Items]
Operating revenues	2,254.3	3,181.9	3,654.1
Intersegment Revenues	0.0	0.0	0.0
Costs of product/services sold	1,600.5	2,544.9	3,129.4
Operations and maintenance	131.8	138.8	125.8
General and administrative	86.7	98.2	83.5
Gain (loss) on long-lived assets, net	(26.0)	(6.2)	(28.6)
Goodwill impairment	(80.3)	0.0	0.0
Gain on acquisition	0.0	209.4	0.0
Earnings from unconsolidated affiliates, net	32.5	32.8	53.3
Other income (expense), net	0.0	0.2	0.0
EBITDA	361.5	636.2	340.1
Goodwill	138.6	218.9
Assets	5,385.5	5,504.0
Purchases of property, plant and equipment	168.3	455.5	305.5
Crestwood Equity Partners LP
Segment Reporting Information [Line Items]
General and administrative	4.8	5.2	4.6
Other income (expense), net	(0.7)	0.4	0.4
EBITDA	356.0	631.4	335.9
Assets	5,243.7	5,349.3
Corporate
Segment Reporting Information [Line Items]
Assets	29.5	29.1
Corporate \| CMLP
Segment Reporting Information [Line Items]
Operating revenues	0.0	0.0	0.0
Intersegment Revenues	0.0	0.0	0.0
Costs of product/services sold	0.0	0.0	0.0
Operations and maintenance	0.0	0.0	0.0
General and administrative	86.7	98.2	83.5
Gain (loss) on long-lived assets, net	0.2	0.2	1.7
Goodwill impairment	0.0
Gain on acquisition		0.0
Earnings from unconsolidated affiliates, net	0.0	0.0	0.0
Other income (expense), net		0.2
EBITDA	(86.5)	(97.8)	(81.8)
Assets	26.2	24.4
Purchases of property, plant and equipment	1.1	1.9	4.6
Corporate \| Crestwood Equity Partners LP
Segment Reporting Information [Line Items]
General and administrative	4.8	5.2	4.6
Other income (expense), net	(0.7)	0.4	0.4
EBITDA	(92.0)	(102.6)	(86.0)
Gathering and Processing Segment \| Operating Segments
Segment Reporting Information [Line Items]
Assets	3,464.6	3,715.3
Gathering and Processing Segment \| Operating Segments \| CMLP
Segment Reporting Information [Line Items]
Operating revenues	631.4	835.8	946.7
Intersegment Revenues	159.8	175.0	192.4
Costs of product/services sold	261.5	526.1	767.0
Operations and maintenance	84.9	98.7	71.7
General and administrative	0.0	0.0	0.0
Gain (loss) on long-lived assets, net	(23.8)	(6.2)	(3.0)
Goodwill impairment	(80.3)
Gain on acquisition		209.4
Earnings from unconsolidated affiliates, net	(1.0)	(2.1)	22.5
Other income (expense), net		0.0
EBITDA	339.7	587.1	319.9
Assets	3,609.7	3,874.7
Purchases of property, plant and equipment	159.7	447.7	294.7
Gathering and Processing Segment \| Operating Segments \| Crestwood Equity Partners LP
Segment Reporting Information [Line Items]
General and administrative	0.0	0.0	0.0
Other income (expense), net	0.0	0.0	0.0
EBITDA	339.7	587.1	319.9
Storage and Transportation \| Operating Segments
Segment Reporting Information [Line Items]
Assets	944.6	980.2
Storage and Transportation \| Operating Segments \| CMLP
Segment Reporting Information [Line Items]
Operating revenues	13.8	20.4	17.1
Intersegment Revenues	9.2	14.2	10.5
Costs of product/services sold	0.2	0.2	0.2
Operations and maintenance	3.6	4.0	3.3
General and administrative	0.0	0.0	0.0
Gain (loss) on long-lived assets, net	0.0	0.0	0.0
Goodwill impairment	0.0
Gain on acquisition		0.0
Earnings from unconsolidated affiliates, net	33.5	34.9	30.8
Other income (expense), net		0.0
EBITDA	52.7	65.3	54.9
Assets	944.6	980.2
Purchases of property, plant and equipment	0.4	0.1	0.6
Storage and Transportation \| Operating Segments \| Crestwood Equity Partners LP
Segment Reporting Information [Line Items]
General and administrative	0.0	0.0	0.0
Other income (expense), net	0.0	0.0	0.0
EBITDA	52.7	65.3	54.9
Marketing Supply and Logistics
Segment Reporting Information [Line Items]
Operating revenues			2,690.3
Marketing Supply and Logistics \| Operating Segments
Segment Reporting Information [Line Items]
Assets	805.0	624.7
Marketing Supply and Logistics \| Operating Segments \| CMLP
Segment Reporting Information [Line Items]
Operating revenues	1,609.1	2,325.7	2,690.3
Intersegment Revenues	(169.0)	(189.2)	(202.9)
Costs of product/services sold	1,338.8	2,018.6	2,362.2
Operations and maintenance	43.3	36.1	50.8
General and administrative	0.0	0.0	0.0
Gain (loss) on long-lived assets, net	(2.4)	(0.2)	(27.3)
Goodwill impairment	0.0
Gain on acquisition		0.0
Earnings from unconsolidated affiliates, net	0.0	0.0	0.0
Other income (expense), net		0.0
EBITDA	55.6	81.6	47.1
Assets	805.0	624.7
Purchases of property, plant and equipment	7.1	5.8	5.6
Marketing Supply and Logistics \| Operating Segments \| Crestwood Equity Partners LP
Segment Reporting Information [Line Items]
General and administrative	0.0	0.0	0.0
Other income (expense), net	0.0	0.0	0.0
EBITDA	$ 55.6	$ 81.6	$ 47.1

Revenues (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Contract liabilities	$ 172.2	$ 144.7
ASC 606 Accounts Receivable	$ 219.9	$ 225.0

Revenues Contract Assets and Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Contract with Customer, Asset, Gross, Noncurrent	$ 1.0	$ 1.2
Deferred revenue	10.3	8.8
Contract liabilities	172.2	$ 144.7
Contract with Customer, Liability, Revenue Recognized	$ 11.6

Revenues Remaining Performance Obligations (Details) $ in Millions	Dec. 31, 2020 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligations, amount	$ 159.6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligations, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligations, amount	$ 94.2
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligations, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligations, amount	$ 54.1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligations, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligations, amount	$ 8.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligations, expected timing of satisfaction, period	1 year
Revenue, remaining performance obligations, amount	$ 3.3
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2037-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligations, expected timing of satisfaction, period	16 years

Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
Income Taxes (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Deferred:
Total deferred	$ (0.1)	$ 0.0	$ 0.7
(Provision) benefit for income taxes	(0.4)	(0.3)	(0.1)
Crestwood Equity Partners LP
Income Tax Contingency [Line Items]
Deferred Tax Assets, Gross	0.2	0.2
Current:
Federal	(0.2)	(0.1)	(0.5)
State	(0.1)	(0.2)	(0.3)
Total current	(0.3)	(0.3)	(0.8)
Deferred:
Federal	(0.1)	0.1	0.5
State	0.0	(0.1)	0.2
Total deferred	(0.1)	0.0	0.7
(Provision) benefit for income taxes	(0.4)	(0.3)	(0.1)
Deferred Tax Assets, Net [Abstract]
Total deferred tax liability	(2.9)	(2.8)
Deferred Tax Liabilities, Net [Abstract]
Total deferred tax liability(1)	(2.7)	(2.6)
CMLP
Income Tax Contingency [Line Items]
Deferred Tax Assets, Gross	0.0	0.0
Current:
Federal	0.1	0.1	0.1
State	0.0	(0.2)	(0.2)
Total current	0.1	(0.1)	(0.1)
Deferred:
Federal	0.0	0.0	0.0
State	0.0	(0.2)	0.1
Total deferred	0.0	(0.2)	0.1
(Provision) benefit for income taxes	0.1	(0.3)	$ 0.0
Deferred Tax Assets, Net [Abstract]
Total deferred tax liability	(0.7)	(0.7)
Deferred Tax Liabilities, Net [Abstract]
Total deferred tax liability(1)	$ (0.7)	$ (0.7)

Related Party Transactions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Apr. 09, 2019
Related Party Transaction [Line Items]
Purchases of property, plant and equipment	$ 168.3	$ 455.5	$ 305.5
Related Parties Amount in Cost of Sales	21.0	45.4	134.7
Related Party Transaction, Due from (to) Related Party [Abstract]
Related Party Transaction, Expenses from Transactions with Related Party	$ 21.8	25.9	28.7
Related Party Transaction, Extension Term	3 years
Applied Consultants, Inc.
Related Party Transaction [Line Items]
Purchases of property, plant and equipment	$ 3.5	9.9
Affiliated Entity
Related Party Transaction [Line Items]
Revenues at CEQP and CMLP(1)	27.8	2.9	1.0
Related Parties Amount in Cost of Sales	21.0	45.4	134.7
General and administrative expenses charged by CEQP to CMLP, net(4)	31.1	41.4	20.7
Crestwood Permian Basin Holdings LLC
Related Party Transaction [Line Items]
Revenues at CEQP and CMLP(1)	27.8	1.0	1.0
Related Parties Amount in Cost of Sales	20.0	19.0	56.1
Ascent Resources - Utica, LLC
Related Party Transaction [Line Items]
Related Parties Amount in Cost of Sales	0.4	23.9	78.6
Blue Racer Midstream, LLC
Related Party Transaction [Line Items]
Related Parties Amount in Cost of Sales		0.2
Stagecoach Gas Services LLC
Related Party Transaction [Line Items]
Revenues at CEQP and CMLP(1)		1.2
Related Parties Amount in Cost of Sales		2.3
Westlake Chemical Corporation
Related Party Transaction [Line Items]
Revenues at CEQP and CMLP(1)		0.7
Tres Palacios Holdings LLC
Related Party Transaction [Line Items]
Related Parties Amount in Cost of Sales	0.6
CMLP
Related Party Transaction [Line Items]
Purchases of property, plant and equipment	168.3	455.5	305.5
Related Parties Amount in Cost of Sales	21.0	45.4	134.7
CMLP \| Affiliated Entity
Related Party Transaction [Line Items]
General and administrative expenses charged by CEQP to CMLP, net(4)	4.0	3.7	3.6
Related Party Transaction, Due from (to) Related Party [Abstract]
Accounts payable at CEQP	5.0	13.1
Crestwood Equity Partners LP
Related Party Transaction [Line Items]
Related Party Transaction, (Income) Expenses from Transactions with Related Party	6.5	(0.6)	(2.7)
Crestwood Equity Partners LP \| Affiliated Entity
Related Party Transaction [Line Items]
General and administrative expenses charged by CEQP to CMLP, net(4)	2.1	1.3	1.5
Related Party Transaction, Due from (to) Related Party [Abstract]
Accounts receivable at CEQP and CMLP	2.5	7.3
Accounts payable at CEQP	7.5	15.6
Crestwood Niobrara LLC \| Williams Partners LP
Related Party Transaction, Due from (to) Related Party [Abstract]
Business Acquisition, Percentage of Voting Interest After Acquisition				100.00%
Additional voting interest acquired				50.00%
Crestwood Long-Term Incentive Plan \| CMLP
Related Party Transaction [Line Items]
Allocated share based compensation expense	35.1	45.1	24.3
Crestwood Long-Term Incentive Plan \| Crestwood Holdings
Related Party Transaction [Line Items]
Allocated share based compensation expense	4.4	1.9	4.2
Stagecoach Gas Services LLC
Related Party Transaction, Due from (to) Related Party [Abstract]
Related Party Transaction, Expenses from Transactions with Related Party	6.6	7.5	7.9
Tres Palacios Holdings LLC
Related Party Transaction, Due from (to) Related Party [Abstract]
Related Party Transaction, Expenses from Transactions with Related Party	4.1	4.4	3.8
Crestwood Permian Basin Holdings
Related Party Transaction, Due from (to) Related Party [Abstract]
Related Party Transaction, Expenses from Transactions with Related Party	$ 11.1	13.5	15.9
Jackalope Gas Gathering Services, LLC
Related Party Transaction, Due from (to) Related Party [Abstract]
Related Party Transaction, Expenses from Transactions with Related Party		$ 0.5	$ 1.1

Schedule I - Crestwood Equity Partners LP - Parent Only - Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Cash	$ 14.0	$ 25.7
Total current assets	405.9	376.4
Property, plant and equipment, net	2,917.1	2,909.1
Total assets	5,243.7	5,349.3
Accrued expenses	122.0	161.7
Total current liabilities	377.8	357.8
Other long-term liabilities	253.3	244.6
Total partners’ capital	1,655.4	1,932.8
Total liabilities and partners’ capital	5,243.7	5,349.3
Parent Company
Condensed Financial Statements, Captions [Line Items]
Cash	0.2	0.2	$ 0.2	$ 0.3
Total current assets	0.2	0.2
Property, plant and equipment, net	0.9	1.0
Investments in subsidiaries	1,655.7	1,935.9
Other assets	2.1	3.1
Total assets	1,658.9	1,940.2
Accounts payable	0.1	0.1
Accrued expenses	1.9	1.3
Total current liabilities	2.0	1.4
Other long-term liabilities	1.5	6.0
Total partners’ capital	1,655.4	1,932.8
Total liabilities and partners’ capital	$ 1,658.9	$ 1,940.2

Schedule I - Crestwood Equity Partners LP - Parent Only - Statement of Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]
Revenues	$ 2,254.3	$ 3,181.9	$ 3,654.1
Operating income	86.8	402.2	113.5
Other income (expense), net	(0.7)	0.6	0.4
Net income (loss)	(15.3)	319.9	67.0
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	(15.3)	320.2	66.3
Parent Company
Condensed Financial Statements, Captions [Line Items]
Revenues	0.0	0.0	0.0
Costs and Expenses	4.9	5.3	6.1
Operating income	(4.9)	(5.3)	(6.1)
Loss from unconsolidated affiliates	(50.5)	290.0	56.5
Other income (expense), net	(0.7)	0.4	0.4
Net income (loss)	(56.1)	285.1	50.8
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ (56.1)	$ 285.4	$ 50.1

- Definition

+ References + Details

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

Schedule I - Crestwood Equity Partners LP - Parent Only - Statement of Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	$ (15.3)	$ 319.9	$ 67.0
Change in fair value of Suburban Propane Partners, L.P. units	0.0	0.3	(0.7)
Comprehensive income (loss)	(15.3)	320.2	66.3
Parent Company
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	(56.1)	285.1	50.8
Change in fair value of Suburban Propane Partners, L.P. units	0.0	0.3	(0.7)
Comprehensive income (loss)	$ (56.1)	$ 285.4	$ 50.1

- Definition

+ References + Details

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

+ Details

Schedule I - Crestwood Equity Partners LP - Parent Only - Condensed Statement of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	$ 408.1	$ 420.4	$ 253.6
Cash flows from investing activities	(273.3)	(943.7)	(241.2)
Payments on long-term debt	(975.8)	(1,729.5)	(2,015.7)
Distributions to partners	(182.7)	(172.4)	(170.8)
Net cash provided by (used in) financing activities	(146.5)	531.8	3.5
Cash at beginning of period	25.7
Cash at end of period	14.0	25.7
Parent Company
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	(9.4)	(3.7)	(3.8)
Cash flows from investing activities	242.6	235.8	238.4
Distributions to partners	(242.8)	(232.5)	(230.9)
Change in intercompany balances	9.6	0.4	(3.8)
Net cash provided by (used in) financing activities	(233.2)	(232.1)	(234.7)
Net change in cash	0.0	0.0	(0.1)
Cash at beginning of period	0.2	0.2	0.3
Cash at end of period	$ 0.2	$ 0.2	$ 0.2

Schedule I - Crestwood Equity Partners LP - Parent Only - Distributions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Parent Company
Dividends received from CMLP	$ 242.6	$ 235.8	$ 238.4

Schedule II - Crestwood Equity Partners LP - Valuation and Qualifying Accounts (Details) - Allowance for Doubtful Accounts - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	$ 0.3	$ 0.3	$ 2.4
Valuation Allowances and Reserves, Charged to Cost and Expense	0.5	0.1	0.2
Valuation Allowances and Reserves, Charged to Other Accounts	0.7	0.0	0.0
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	(0.6)	(0.1)	(2.3)
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	$ 0.9	$ 0.3	$ 0.3