0001136352-21-000006 | 10-Q | XBRL Viewer | Crestwood Equity Partners LP

Cover Page - shares	3 Months Ended
Cover Page - shares	Mar. 31, 2021	Apr. 23, 2021
Document Information [Line Items]
Document Transition Report	false
Document Quarterly Report	true
Entity Shell Company	false
Entity Interactive Data Current	Yes
Entity Current Reporting Status	Yes
Entity Address, Address Line One	811 Main Street
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Entity Registrant Name	Crestwood Equity Partners LP
Entity File Number	001-34664
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	43-1918951
Entity Central Index Key	0001136352
Current Fiscal Year End Date	--12-31
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		62,832,258
Entity Address, Address Line Two	Suite 3400
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77002
City Area Code	832
Local Phone Number	519-2200
Document Type	10-Q
Document Period End Date	Mar. 31, 2021
Crestwood Midstream Partners LP
Document Information [Line Items]
Entity Shell Company	false
Entity Interactive Data Current	Yes
Entity Current Reporting Status	Yes
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Entity Registrant Name	Crestwood Midstream Partners LP
Entity File Number	001-35377
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	20-1647837
Entity Central Index Key	0001304464
Current Fiscal Year End Date	--12-31
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		0
Document Type	10-Q
Document Period End Date	Mar. 31, 2021
Common Units
Document Information [Line Items]
Title of 12(b) Security	Common Units representing limited partnership interests
Trading Symbol	CEQP
Security Exchange Name	NYSE
Preferred Units
Document Information [Line Items]
Title of 12(b) Security	Preferred Units representing limited partnership interests
Trading Symbol	CEQP-P
Security Exchange Name	NYSE

Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Assets
Cash	$ 16.3	$ 14.0
Accounts receivable, less allowance for doubtful accounts of $1.4 million and $0.9 million at March 31, 2021 and December 31, 2020	243.6	262.2
Inventory	52.3	89.1
Assets from price risk management activities	21.0	27.2
Prepaid expenses and other current assets	10.5	13.4
Total current assets	343.7	405.9
Property, plant and equipment	3,767.6	3,759.6
Less: accumulated depreciation	885.0	842.5
Property, plant and equipment, net	2,882.6	2,917.1
Intangible assets	1,126.1	1,126.1
Less: accumulated amortization	347.0	331.8
Intangible assets, net	779.1	794.3
Goodwill	138.6	138.6
Operating lease right-of-use assets, net	32.4	36.8
Investments in unconsolidated affiliates	832.8	943.7
Other non-current assets	8.1	7.3
Total assets	5,017.3	5,243.7
Current liabilities:
Accounts payable	238.4	160.3
Accrued expenses and other liabilities	131.9	122.0
Liabilities from price risk management activities	61.6	76.3
Contingent consideration, current portion	19.0	19.0
Current portion of long-term debt	0.2	0.2
Total current liabilities	451.1	377.8
Long-term debt, less current portion	2,588.2	2,483.8
Contingent consideration	19.0	38.0
Other long-term liabilities	255.2	253.3
Deferred income taxes	2.7	2.7
Total liabilities	3,316.2	3,155.6
Commitments and contingencies (Note 8)
Interest of non-controlling partner in subsidiary	433.5	432.7
Partners’ capital:
Crestwood Equity Partners LP partners’ capital (62,825,308 common units issued and outstanding at March 31, 2021 and 73,970,208 common and subordinated units issued and outstanding at December 31, 2020)	655.6	1,043.4
Preferred units (71,257,445 units issued and outstanding at both March 31, 2021 and December 31, 2020)	612.0	612.0
Total partners’ capital	1,267.6	1,655.4
Total liabilities and capital	$ 5,017.3	$ 5,243.7
Limited Partners' Capital Account, Units Issued	62,825,308	73,970,208
Limited Partners' Capital Account, Units Outstanding	62,825,308	73,970,208
Preferred Units, Issued	71,257,445	71,257,445
Preferred Units, Outstanding	71,257,445	71,257,445
Crestwood Midstream Partners LP
Assets
Cash	$ 15.9	$ 13.7
Accounts receivable, less allowance for doubtful accounts of $1.4 million and $0.9 million at March 31, 2021 and December 31, 2020	243.5	262.2
Inventory	52.3	89.1
Assets from price risk management activities	21.0	27.2
Prepaid expenses and other current assets	10.5	13.4
Total current assets	343.2	405.6
Property, plant and equipment	4,097.7	4,089.6
Less: accumulated depreciation	1,074.3	1,028.3
Property, plant and equipment, net	3,023.4	3,061.3
Intangible assets	1,126.1	1,126.1
Less: accumulated amortization	347.0	331.8
Intangible assets, net	779.1	794.3
Goodwill	138.6	138.6
Operating lease right-of-use assets, net	32.4	36.8
Investments in unconsolidated affiliates	832.8	943.7
Other non-current assets	5.9	5.2
Total assets	5,155.4	5,385.5
Current liabilities:
Accounts payable	238.3	157.8
Accrued expenses and other liabilities	126.8	120.1
Liabilities from price risk management activities	61.6	76.3
Contingent consideration, current portion	19.0	19.0
Current portion of long-term debt	0.2	0.2
Total current liabilities	445.9	373.4
Long-term debt, less current portion	2,588.2	2,483.8
Contingent consideration	19.0	38.0
Other long-term liabilities	253.4	251.8
Deferred income taxes	0.7	0.7
Total liabilities	3,307.2	3,147.7
Commitments and contingencies (Note 8)
Interest of non-controlling partner in subsidiary	433.5	432.7
Partners’ capital:
Partners' capital	1,414.7	1,805.1
Total liabilities and capital	$ 5,155.4	$ 5,385.5

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Allowance for doubtful accounts	$ 1.4	$ 0.9
Limited Partners' Capital Account, Units Issued	62,825,308	73,970,208
Limited Partners' Capital Account, Units Outstanding	62,825,308	73,970,208
Preferred Units, Issued	71,257,445	71,257,445
Preferred Units, Outstanding	71,257,445	71,257,445
Crestwood Midstream Partners LP
Allowance for doubtful accounts	$ 1.4	$ 0.9

Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues:
Revenues	$ 1,032.7	$ 727.9
Costs of product/services sold (exclusive of items shown separately below):
Product costs - related party (Note 14)	41.1	3.2
Total costs of product/services sold	813.8	534.4
Operating expenses and other:
Operations and maintenance	32.8	37.6
General and administrative	18.7	14.9
Depreciation, amortization and accretion	59.2	56.1
Loss on long-lived assets, net	1.4	1.0
Goodwill impairment	0.0	80.3
Total expenses	112.1	189.9
Operating income (loss)	106.8	3.6
Earnings (loss) from unconsolidated affiliates, net	(103.7)	5.5
Interest and debt expense, net	(36.0)	(32.6)
Gain (Loss) on Extinguishment of Debt	(5.5)	0.0
Other income, net	0.0	0.1
Loss before income taxes	(38.4)	(23.4)
Benefit for income taxes	0.1	0.0
Net loss	(38.3)	(23.4)
Net income attributable to non-controlling partner	10.1	9.9
Net income (loss) attributable to parent	(48.4)	(33.3)
Net income attributable to preferred unit holders	15.0	15.0
Net loss attributable to partners	$ (63.4)	$ (48.3)
Net loss per limited partner unit: (Note 11)
Basic (in dollars per share)	$ (0.86)	$ (0.66)
Diluted (in dollars per share)	$ (0.86)	$ (0.66)
Weighted-average limited partners’ units outstanding:
Basic (units)	74.1	72.9
Diluted (units)	74.1	72.9
Crestwood Midstream Partners LP
Revenues:
Revenues	$ 1,032.7	$ 727.9
Related party (Note 14)	0.0	0.2
Costs of product/services sold (exclusive of items shown separately below):
Product costs - related party (Note 14)	41.1	3.2
Total costs of product/services sold	813.8	534.4
Operating expenses and other:
Operations and maintenance	32.8	37.6
General and administrative	17.2	13.5
Depreciation, amortization and accretion	62.8	59.6
Loss on long-lived assets, net	1.4	1.0
Goodwill impairment	0.0	80.3
Total expenses	114.2	192.0
Operating income (loss)	104.7	1.5
Earnings (loss) from unconsolidated affiliates, net	(103.7)	5.5
Interest and debt expense, net	(36.0)	(32.6)
Gain (Loss) on Extinguishment of Debt	(5.5)	0.0
Loss before income taxes	(40.5)	(25.6)
Benefit for income taxes	0.1	0.0
Net loss	(40.4)	(25.6)
Net income attributable to non-controlling partner	10.1	9.9
Net income (loss) attributable to parent	(50.5)	(35.5)
Product
Revenues:
Revenues	935.5	606.5
Related party (Note 14)	4.9	7.3
Costs of product/services sold (exclusive of items shown separately below):
Costs of product/services sold	767.6	524.6
Product \| Crestwood Midstream Partners LP
Revenues:
Revenues	935.5	606.5
Related party (Note 14)	4.9	7.3
Costs of product/services sold (exclusive of items shown separately below):
Costs of product/services sold	767.6	524.6
Service
Revenues:
Revenues	97.2	121.4
Related party (Note 14)	0.0	0.2
Costs of product/services sold (exclusive of items shown separately below):
Costs of product/services sold	5.1	6.6
Service \| Crestwood Midstream Partners LP
Revenues:
Revenues	97.2	121.4
Costs of product/services sold (exclusive of items shown separately below):
Costs of product/services sold	5.1	6.6
Gathering and Processing Segment \| Product
Revenues:
Revenues	67.9	102.7
Gathering and Processing Segment \| Product \| Crestwood Midstream Partners LP
Revenues:
Revenues	67.9	102.7
Gathering and Processing Segment \| Service
Revenues:
Revenues	86.5	112.2
Gathering and Processing Segment \| Service \| Crestwood Midstream Partners LP
Revenues:
Revenues	86.5	112.2
Marketing Supply and Logistics
Revenues:
Revenues		509.5
Marketing Supply and Logistics \| Product
Revenues:
Revenues	862.7	496.5
Marketing Supply and Logistics \| Product \| Crestwood Midstream Partners LP
Revenues:
Revenues	862.7	496.5
Marketing Supply and Logistics \| Service
Revenues:
Revenues	8.7	5.5
Marketing Supply and Logistics \| Service \| Crestwood Midstream Partners LP
Revenues:
Revenues	8.7	5.5
Storage and Transportation \| Service
Revenues:
Revenues	2.0	3.5
Storage and Transportation \| Service \| Crestwood Midstream Partners LP
Revenues:
Revenues	$ 2.0	$ 3.5

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ (38.3)	$ (23.4)
Change in fair value of Suburban Propane Partners, L.P. units	0.0	(1.1)
Comprehensive loss	(38.3)	(24.5)
Comprehensive income attributable to non-controlling partner	10.1	9.9
Comprehensive loss attributable to Crestwood Equity Partners LP	$ (48.4)	$ (34.4)

- 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 ($) $ in Millions	Total	Preferred Units	Common unit	Partners' Capital	Crestwood Midstream Partners LP	Crestwood Midstream Partners LP Partners' Capital	Preferred Units	Common Units	Subordinated Units
Partner units, beginning balance (in units) at Dec. 31, 2019								71,900,000	400,000
Preferred units, beginning balance (in units) at Dec. 31, 2019							71,300,000
Beginning balance at Dec. 31, 2019		$ 612.0	$ 1,320.8	$ 1,932.8		$ 2,099.3
Increase (Decrease) in Partners' Capital [Roll Forward]
Distributions to partners		(15.0)	(45.3)	(60.3)		(57.0)
Unit-based compensation charges			0.2	0.2		(4.4)
Unit-based compensation charges (in shares)								1,700,000
Taxes paid for unit-based compensation vesting			(15.1)	(15.1)		(15.1)
Taxes paid for unit-based compensation vesting (in shares)								(500,000)
Change in fair value of Suburban Propane Partners, L.P. units	$ (1.1)		(1.1)	(1.1)
Other			3.5	3.5		(1.1)
Net income (loss) attributable to parent	$ (33.3)	15.0	(48.3)	(33.3)	$ (35.5)	(35.5)
Preferred units, ending balance (in units) at Mar. 31, 2020							71,300,000
Partner units, ending balance (in units) at Mar. 31, 2020								73,300,000	400,000
Ending Balance at Mar. 31, 2020		612.0	1,214.7	1,826.7		1,986.2
Increase (Decrease) in Partners' Capital [Roll Forward]
Other (in shares)								200,000
Partner units, beginning balance (in units) at Dec. 31, 2020								73,600,000	400,000
Preferred units, beginning balance (in units) at Dec. 31, 2020	71,257,445						71,300,000
Beginning balance at Dec. 31, 2020		612.0	1,043.4	1,655.4	1,805.1	1,805.1
Increase (Decrease) in Partners' Capital [Roll Forward]
Distributions to partners		(15.0)	(46.4)	(61.4)		(334.0)
Stock Repurchased and Retired During Period, Value			(273.2)	(273.2)
Unit-based compensation charges			3.7	3.7		2.3
Treasury Stock, Shares, Retired								(11,500,000)	(400,000)
Unit-based compensation charges (in shares)								1,100,000
Taxes paid for unit-based compensation vesting			(8.1)	(8.1)		(8.1)
Taxes paid for unit-based compensation vesting (in shares)								(400,000)
Change in fair value of Suburban Propane Partners, L.P. units	$ 0.0
Other			(0.4)	(0.4)		(0.1)
Net income (loss) attributable to parent	$ (48.4)	15.0	(63.4)	(48.4)	(50.5)	(50.5)
Preferred units, ending balance (in units) at Mar. 31, 2021	71,257,445						71,300,000
Partner units, ending balance (in units) at Mar. 31, 2021								62,800,000	0
Ending Balance at Mar. 31, 2021		$ 612.0	$ 655.6	$ 1,267.6	$ 1,414.7	$ 1,414.7
Increase (Decrease) in Partners' Capital [Roll Forward]
Other (in shares)								0

Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating activities
Net loss	$ (38.3)	$ (23.4)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, amortization and accretion	59.2	56.1
Amortization of debt-related deferred costs	1.7	1.6
Unit-based compensation charges	2.3	(4.4)
Loss on long-lived assets, net	1.4	1.0
Goodwill impairment	0.0	80.3
Loss on modification/extinguishment of debt	5.5	0.0
Earnings from unconsolidated affiliates, net, adjusted for cash distributions received	103.8	4.5
Deferred income taxes	0.0	(0.2)
Other Operating Activities, Cash Flow Statement	0.1	0.0
Changes in operating assets and liabilities	122.8	3.7
Net cash provided by operating activities	258.5	119.2
Investing activities
Purchases of property, plant and equipment	(9.3)	(86.8)
Investments in unconsolidated affiliates	(10.2)	(6.0)
Capital distributions from unconsolidated affiliates	17.3	9.5
Net proceeds from sale of assets	0.2	0.0
Net cash used in investing activities	(2.0)	(83.3)
Financing activities
Proceeds from the issuance of long-term debt	1,126.3	275.9
Payments on long-term debt	(1,018.1)	(246.9)
Payments on finance leases	(0.7)	(0.8)
Payments for debt-related deferred costs	(11.1)	0.0
Payments for Repurchase of Common Stock	(271.8)	0.0
Distributions to partners	(46.4)	(45.3)
Distributions to non-controlling partner	(9.3)	(9.2)
Distributions to preferred unitholders	(15.0)	(15.0)
Taxes paid for unit-based compensation vesting	(8.1)	(15.1)
Net cash used in financing activities	(254.2)	(56.4)
Net change in cash	2.3	(20.5)
Cash at beginning of period	14.0	25.7
Cash at end of period	16.3	5.2
Supplemental schedule of noncash investing activities
Net change to property, plant and equipment through accounts payable and accrued expenses	(2.2)	21.3
Crestwood Midstream Partners LP
Operating activities
Net loss	(40.4)	(25.6)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, amortization and accretion	62.8	59.6
Amortization of debt-related deferred costs	1.7	1.6
Unit-based compensation charges	2.3	(4.4)
Loss on long-lived assets, net	1.4	1.0
Goodwill impairment	0.0	80.3
Loss on modification/extinguishment of debt	5.5	0.0
Earnings from unconsolidated affiliates, net, adjusted for cash distributions received	103.8	4.5
Other Operating Activities, Cash Flow Statement	0.1	0.0
Changes in operating assets and liabilities	122.0	(1.2)
Net cash provided by operating activities	259.2	115.8
Investing activities
Purchases of property, plant and equipment	(9.3)	(86.8)
Investments in unconsolidated affiliates	(10.2)	(6.0)
Capital distributions from unconsolidated affiliates	17.3	9.5
Net proceeds from sale of assets	0.2	0.0
Net cash used in investing activities	(2.0)	(83.3)
Financing activities
Proceeds from the issuance of long-term debt	1,126.3	275.9
Payments on long-term debt	(1,018.1)	(246.9)
Payments on finance leases	(0.7)	(0.8)
Payments for debt-related deferred costs	(11.1)	0.0
Distributions to partners	(334.0)	(57.0)
Distributions to non-controlling partner	(9.3)	(9.2)
Taxes paid for unit-based compensation vesting	(8.1)	(15.1)
Net cash used in financing activities	(255.0)	(53.1)
Net change in cash	2.2	(20.6)
Cash at beginning of period	13.7	25.4
Cash at end of period	15.9	4.8
Supplemental schedule of noncash investing activities
Net change to property, plant and equipment through accounts payable and accrued expenses	$ (2.2)	$ 21.3

Organization and Business Description	3 Months Ended
Organization and Business Description	Mar. 31, 2021
Disclosure Partnership Organization And Basis Of Presentation Narrative [Abstract]
Organization and Business Description	Organization and Business Description The accompanying notes to the consolidated financial statements apply to Crestwood Equity Partners LP (Crestwood Equity or CEQP) and Crestwood Midstream Partners LP (Crestwood Midstream or CMLP), unless otherwise indicated. The accompanying consolidated financial statements and related notes should be read in conjunction with our 2020 Annual Report on Form 10-K filed with the Securities and Exchange Commission (SEC) on February 26, 2021. The financial information as of March 31, 2021, and for the three months ended March 31, 2021 and 2020, is unaudited. The consolidated balance sheets as of December 31, 2020 were derived from the audited balance sheets filed in our 2020 Annual Report on Form 10-K. 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 itself or Crestwood Midstream Partners LP and its consolidated subsidiaries. Organization Crestwood Equity Partners LP. CEQP is a publicly-traded (NYSE: CEQP) Delaware limited partnership formed in March 2001. Crestwood Equity GP LLC (Crestwood Equity GP), which is indirectly owned by Crestwood Holdings LLC (Crestwood Holdings), owns our non-economic general partnership interest. Crestwood Holdings is substantially owned and controlled by First Reserve Management, L.P. (First Reserve). 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. Crestwood Holdings Strategic Transactions. In March 2021, CEQP acquired approximately 11.5 million CEQP common units, 0.4 million subordinated units of CEQP and 100% of the equity interests of Crestwood Marcellus Holdings LLC and Crestwood Gas Services Holdings LLC (whose assets consisted solely of CEQP common and subordinated units and 1% of the limited partner interests in Crestwood Holdings LP) from Crestwood Holdings, and signed a definitive agreement to acquire the general partner and the remaining 99% limited partner interests of Crestwood Holdings LP (whose assets consist solely of its ownership interest in Crestwood Equity GP LLC, which owns CEQP’s non-economic general partner interest) (collectively the Crestwood Holdings Transactions) for $268 million in cash. The acquisition of the general partner and limited partner interests of Crestwood Holdings LP will close on or before the 180th day after the date of the initial closing of the Crestwood Holdings Transactions. The purchase price was funded through borrowings under the Crestwood Midstream credit facility. CEQP retired the common and subordinated units acquired in the Crestwood Holdings Transactions. The diagram below reflects a simplified version our ownership structure as of March 31, 2021 following the Crestwood Holdings Transactions. Business Description 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 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 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 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	3 Months Ended
	Mar. 31, 2021
Accounting Policies [Abstract]
Basis of Presentation and Significant Accounting Policies	Basis of Presentation and Summary of Significant Accounting Policies Basis of Presentation Our consolidated financial statements are prepared in accordance with Generally Accepted Accounting Principles (GAAP) and include the accounts of all consolidated subsidiaries after the elimination of all intercompany accounts and transactions. 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. Certain information and footnote disclosures normally included in annual consolidated financial statements prepared in accordance with GAAP have been omitted pursuant to the rules and regulations of the SEC. Significant Accounting Policies There were no material changes in our significant accounting policies from those described in our 2020 Annual Report on Form 10-K. During the three months ended March 31, 2020, we recorded an $80.3 million full impairment of the goodwill associated with our Powder River Basin reporting unit based on events that occurred during 2020 which resulted in a significant decrease in the forecasted cash flows and fair value of the reporting unit. For a further discussion of this goodwill impairment, see our 2020 Annual Report on Form 10-K.

Certain Balance Sheet Information

3 Months Ended

Mar. 31, 2021

Balance Sheet Related Disclosures [Abstract]

Certain Balance Sheet Information

Accrued Expenses and Other Liabilities

Accrued expenses and other liabilities consisted of the following (in millions):


	CEQP				CMLP
	March 31,		December 31,		March 31,		December 31,
	2021		2020		2021		2020
Accrued expenses	$	41.7	$	48.3	$	36.6	$	46.4
Accrued property taxes	5.2		8.4		5.2		8.4
Income tax payable	0.3		0.2		0.3		0.2
Interest payable	47.0		24.9		47.0		24.9
Accrued additions to property, plant and equipment	12.2		12.3		12.2		12.3
Operating leases	12.5		14.7		12.5		14.7
Finance leases	2.9		2.9		2.9		2.9
Deferred revenue	10.1		10.3		10.1		10.3

Total accrued expenses and other liabilities	$	131.9	$	122.0	$	126.8	$	120.1

Other Long-Term Liabilities

Other long-term liabilities consisted of the following (in millions):


	CEQP				CMLP
	March 31,		December 31,		March 31,		December 31,
	2021		2020		2021		2020
Contract liabilities	$	176.5	$	172.2	$	176.5	$	172.2
Operating leases	25.9		28.5		25.9		28.5
Asset retirement obligations	34.6		34.1		34.6		34.1
Other	18.2		18.5		16.4		17.0
Total other long-term liabilities	$	255.2	$	253.3	$	253.4	$	251.8

Investments in Unconsolidated Affiliates

3 Months Ended

Mar. 31, 2021

Equity Method Investments and Joint Ventures [Abstract]

Investments in Unconsolidated Affiliates

Variable Interest Entity

Crestwood Permian Basin Holdings LLC (Crestwood Permian) is a joint venture owned by Crestwood Infrastructure Holdings LLC (Crestwood Infrastructure), our wholly-owned subsidiary, and an affiliate of First Reserve. We manage and account for our 50% ownership interest in Crestwood Permian, which is a variable interest entity, 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)

Our net investments in and earnings from our unconsolidated affiliates are as follows (in millions):


	Investment				Earnings (Loss) from Unconsolidated Affiliates
						Three Months Ended
	March 31,		December 31,		March 31,
	2021		2020			2021		2020
Stagecoach Gas Services LLC(1)	$	666.2	$	792.5		$	(112.3)	$	9.2
Tres Palacios Holdings LLC(2)	51.7		35.5			9.3		—
Powder River Basin Industrial Complex, LLC(3)	3.6		3.6			0.1		(4.5)
Crestwood Permian Basin Holdings LLC(4)	111.3		112.1			(0.8)		0.8
Total	$	832.8	$	943.7		$	(103.7)	$	5.5

(1)As of March 31, 2021, our equity in the underlying net assets of Stagecoach Gas Services LLC (Stagecoach Gas) approximates the carrying value of our investment. During the first quarter of 2021, we recorded our share of a goodwill impairment recorded by our Stagecoach Gas equity investment, based on market-based information received by Stagecoach Gas from Con Edison Gas Pipeline and Storage Northeast, LLC’s (the other 50% owner of Stagecoach Gas) strategic evaluation of its investment during the three months ended March 31, 2021. This eliminated our $51.3 million historical basis difference between our investment balance and the equity in the underlying net assets of Stagecoach Gas, and also resulted in a $119.9 million reduction in our earnings from unconsolidated affiliates during the three months ended March 31, 2021. Our Stagecoach Gas investment is included in our storage and transportation segment.

(2)As of March 31, 2021, our equity in the underlying net assets of Tres Palacios Holdings LLC (Tres Holdings) exceeded the carrying value of our investment balance by approximately $22.4 million. During both the three months ended March 31, 2021 and 2020, we recorded amortization of approximately $0.3 million related to this excess basis, which is reflected as an increase in our earnings from unconsolidated affiliates in our consolidated statements of operations. Our Tres Holdings investment is included in our storage and transportation segment.

(3)As of March 31, 2021, our equity in the underlying net assets of Powder River Basin Industrial Complex, LLC (PRBIC) approximates the carrying value of our investment balance. During the first quarter of 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 balance and the equity in the underlying net assets of PRBIC, and also resulted in a $4.5 million reduction in our earnings from unconsolidated affiliates during the three months ended March 31, 2020. Our PRBIC investment is included in our storage and transportation segment.

(4)As of March 31, 2021, our equity in the underlying net assets of Crestwood Permian exceeded our investment balance by $8.3 million, and this excess amount is not subject to amortization. Our Crestwood Permian investment is included in our gathering and processing segment.

Summarized Financial Information of Unconsolidated Affiliates

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


	Three Months Ended
	March 31,
	2021						2020
	Operating Revenues		Operating Expenses		Net Income (Loss)		Operating Revenues		Operating Expenses		Net Income (Loss)
Stagecoach Gas	$	35.9	$	363.3	$	(327.4)	$	37.7	$	19.4	$	18.4


Other(1)	76.9		60.4		16.5		28.3		48.5		(19.5)
Total	$	112.8	$	423.7	$	(310.9)	$	66.0	$	67.9	$	(1.1)

(1)Includes our Tres Holdings, PRBIC and Crestwood Permian equity investments.

Distributions and Contributions

The following table summarizes our distributions from and contributions to our unconsolidated affiliates (in millions):


	Distributions(1)				Contributions
	Three Months Ended				Three Months Ended
	March 31,				March 31,
	2021		2020		2021		2020
Stagecoach Gas	$	14.0	$	15.6	$	—	$	—
Tres Holdings	—		—		6.9		6.0
PRBIC	0.1		0.1		—		—
Crestwood Permian	3.3		3.8		3.3		—
Total	$	17.4	$	19.5	$	10.2	$	6.0

(1) In April 2021, we received cash distributions from Stagecoach Gas, Tres Holdings and Crestwood Permian of approximately $13.0 million, $10.6 million and $2.2 million, respectively.

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 (CEGP) because certain performance targets on growth capital projects were not achieved by December 31, 2020. During the three months ended March 31, 2021, we paid $19 million to CEGP related to this obligation. At March 31, 2021, our consolidated balance sheet reflects a $38 million liability related to this obligation, of which $19 million is classified as current. We accrued interest of approximately $1.0 million related to this obligation which is included in accrued expenses and other liabilities on our consolidated balance sheet at March 31, 2021.

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 LLC, a 50% equity investment of Crestwood Permian, in the event Crestwood Permian Basin LLC 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 March 31, 2021 and December 31, 2020.

Risk Management

3 Months Ended

Mar. 31, 2021

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 6.

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 the 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 product costs in our consolidated statements of operations. The following table summarizes the impact to our consolidated statements of operations related to our commodity-based derivatives during the three months ended March 31, 2021 and 2020 (in millions):


	Three Months Ended
	March 31,
		2021		2020
Product revenues		$	114.8	$	75.0
Gain (loss) reflected in product costs		$	(8.1)	$	22.0

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 product costs related to these instruments.

Notional Amounts and Terms

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


	March 31, 2021		December 31, 2020
	Fixed Price Payor	Fixed Price Receiver	Fixed Price Payor	Fixed Price Receiver
Propane, ethane, butane, heating oil and crude oil (MMBbls)	60.8	62.9	72.7	76.5
Natural gas (Bcf)	27.3	36.6	22.6	28.6

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 38 months or less; however, 86% of the contracted volumes will be delivered or settled within 12 months.

Credit Risk

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. The counterparties associated with our price risk management activities are energy marketers and propane retailers, resellers and dealers.

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):


	March 31, 2021		December 31, 2020
Aggregate fair value liability of derivative instruments with credit-risk-related contingent features(1)	$	30.7	$	38.5
NYMEX-related net derivative asset position	$	57.4	$	35.9
NYMEX-related cash collateral received	$	40.0	$	18.3
Cash collateral received, net	$	7.3	$	12.4

(1)At March 31, 2021 and December 31, 2020, we posted $1.0 million and less than $0.1 million of collateral associated with these derivatives.

Fair Value Measurements

3 Months Ended

Mar. 31, 2021

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 March 31, 2021 and December 31, 2020, 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 March 31, 2021 and December 31, 2020 (in millions):


	March 31, 2021

	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	$	20.9	$	531.6	$	—	$	552.5	$	(492.0)	$	(39.5)	$	21.0
Suburban Propane Partners, L.P. units(2)	2.1		—		—		2.1		—		—		2.1
Total assets at fair value	$	23.0	$	531.6	$	—	$	554.6	$	(492.0)	$	(39.5)	$	23.1

Liabilities
Liabilities from price risk management	$	23.6	$	522.2	$	—	$	545.8	$	(492.0)	$	7.8	$	61.6
Total liabilities at fair value	$	23.6	$	522.2	$	—	$	545.8	$	(492.0)	$	7.8	$	61.6

	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

(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 non-current assets on CEQP’s consolidated balance sheets.

Cash, Accounts Receivable and Accounts Payable

As of March 31, 2021 and December 31, 2020, the carrying amounts of cash, accounts receivable and accounts payable approximate fair value based on the short-term nature of these instruments.

Credit Facility

The fair value of the amounts outstanding under our Crestwood Midstream credit facility approximates the carrying amounts as of March 31, 2021 and December 31, 2020, due primarily to the variable nature of the interest rate of the instrument, which is considered a Level 2 fair value measurement.

Senior Notes

We estimate the fair value of our senior notes primarily based on quoted market prices for the same or similar issuances (representing a Level 2 fair value measurement). 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):


	March 31, 2021				December 31, 2020
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
2023 Senior Notes	$	286.8	$	288.1	$	683.8	$	691.5
2025 Senior Notes	$	495.8	$	502.8	$	495.5	$	509.9
2027 Senior Notes	$	593.4	$	589.3	$	593.2	$	594.1
2029 Senior Notes	$	689.9	$	690.4	$	—	$	—

Long-Term Debt

3 Months Ended

Mar. 31, 2021

Debt Disclosure [Abstract]

Long-Term Debt

Long-term debt consisted of the following at March 31, 2021 and December 31, 2020 (in millions):


	March 31, 2021		December 31, 2020
Credit Facility	$	530.0	$	719.0
2023 Senior Notes	288.0		687.2
2025 Senior Notes	500.0		500.0
2027 Senior Notes	600.0		600.0
2029 Senior Notes	700.0		—
Other(1)	0.4		0.4
Less: deferred financing costs, net	30.0		22.6
Total debt	2,588.4		2,484.0
Less: current portion	0.2		0.2
Total long-term debt, less current portion	$	2,588.2	$	2,483.8

(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) is available to fund acquisitions, working capital and internal growth projects and for general partnership purposes. Contemporaneous with the Crestwood Holdings Transactions described in Note 1, Crestwood Midstream entered into the Third Amendment to its credit agreement in order to, among other things, permit the borrowings under the CMLP Credit Facility to fund the Crestwood Holdings Transactions and revise the definition of Change in Control in the CMLP Credit Agreement as it relates to the control of CEQP’s general partner). The other covenants and restrictive provisions under the amended credit agreement are materially consistent with the covenants that existed at December 31, 2020.

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 March 31, 2021, the net debt to consolidated EBITDA ratio was approximately 4.21 to 1.0, the consolidated EBITDA to consolidated interest expense ratio was approximately 4.74 to 1.0, and the senior secured leverage ratio was 0.85 to 1.0.

At March 31, 2021, Crestwood Midstream had $701.2 million of available capacity under its credit facility considering the most restrictive debt covenants in its credit agreement. At March 31, 2021 and December 31, 2020, Crestwood Midstream’s outstanding standby letters of credit were $18.8 million and $23.9 million. Borrowings under the credit facility accrue interest at prime or Eurodollar based rates plus applicable spreads, which resulted in interest rates between 2.36% and 4.50% at

March 31, 2021 and 2.40% and 4.50% at December 31, 2020. The weighted-average interest rate on outstanding borrowings as of March 31, 2021 and December 31, 2020 was 3.29% and 2.45%.

Senior Notes

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 semi-annually in arrears on February 1 and August 1 of each year, beginning on August 1, 2021. The net proceeds from this offering of approximately $691.0 million were used to repay a portion of the 2023 Senior Notes and to repay indebtedness under the CMLP Credit Facility.

2023 Senior Note Repayments. In January 2021, we utilized a portion of the proceeds from the issuance of the 2029 Senior Notes to repurchase and cancel approximately $399.2 million of principal outstanding under our 2023 Senior Notes. In conjunction with the repayment of the notes, we recognized a loss on extinguishment of debt of approximately $5.5 million and paid approximately $7.6 million of accrued interest on the 2023 Notes on the date they were repurchased.

In April 2021, we redeemed the remaining $288 million of principal outstanding under the 2023 Senior Notes. In conjunction with the repayment of the notes, we recognized a loss on extinguishment of debt of approximately $1.2 million and paid approximately $1.0 million of accrued interest on the 2023 Senior Notes on the date they were repurchased. We funded the repayment with borrowings under the CMLP Credit Facility.

Commitments and Contingencies

3 Months Ended

Mar. 31, 2021

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 March 31, 2021 and December 31, 2020, we had approximately $10.5 million and $10.4 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 2019, we experienced produced water releases on our Arrow water gathering system located on the Fort Berthold Indian Reservation in North Dakota. In January 2021, we received a Notice of Violation and Opportunity to Confer from the Environmental Protection Agency (EPA) related to the water releases. In March 2021, we executed a Consent Agreement with the EPA and agreed to pay $0.1 million for penalties related to the water releases. The EPA provided the public a 30-day opportunity to comment on the Consent Agreement beginning on March 30, 2021. We expect to finalize and settle the Consent Agreement after the public comment period concludes. We are also substantially complete with all remediation efforts related to the water releases 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. We have not recorded an insurance receivable as of March 31, 2021.

At both March 31, 2021 and December 31, 2020, our accrual of approximately $1.3 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 March 31, 2021.

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 March 31, 2021 and December 31, 2020 (in millions):


	CEQP				CMLP
	March 31, 2021		December 31, 2020		March 31, 2021		December 31, 2020
Self-insurance reserves(1)	$	7.3	$	7.7	$	6.4	$	6.7

(1)At March 31, 2021, 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.

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 4.

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 March 31, 2021 and December 31, 2020, we have no amounts accrued for these guarantees.

Leases

3 Months Ended

Mar. 31, 2021

Leases [Abstract]

Leases

The following table summarizes the balance sheet information related to our operating and finance leases at March 31, 2021 and December 31, 2020 (in millions):


	March 31, 2021		December 31, 2020
Operating Leases
Operating lease right-of-use assets, net	$	32.4	$	36.8

Accrued expenses and other liabilities	$	12.5	$	14.7
Other long-term liabilities	25.9		28.5
Total operating lease liabilities	$	38.4	$	43.2
Finance Leases
Property, plant and equipment	$	13.0	$	13.3
Less: accumulated depreciation	8.4		7.9
Property, plant and equipment, net	$	4.6	$	5.4

Accrued expenses and other liabilities	$	2.9	$	2.9
Other long-term liabilities	1.3		1.9
Total finance lease liabilities	$	4.2	$	4.8

Lease expense. Our operating lease expense, net totaled $4.8 million and $7.5 million for the three months ended March 31, 2021 and 2020. Our finance lease expense totaled $0.9 million and $1.1 million for the three months ended March 31, 2021 and 2020.

Partners' Capital

3 Months Ended

Mar. 31, 2021

Statement of Partners' Capital [Abstract]

Partners' Capital

Partners’ Capital and Non-Controlling Partner

Common and Subordinated Units

In conjunction with the Crestwood Holdings Transactions discussed in Note 1, in March 2021, CEQP acquired approximately 11.5 million CEQP common units and 0.4 million subordinated units of CEQP from Crestwood Holdings for approximately $268 million. CEQP reflected the purchase price as a reduction to its common unitholders’ partners’ capital in its consolidated statement of partners’ capital during the three months ended March 31, 2021. The Crestwood Holdings Transactions resulted in CEQP retiring the common and subordinated units acquired from Crestwood Holdings. Transaction costs related to the Crestwood Holdings Transactions were approximately $8.0 million of which $7.8 million is reflected as a reduction of CEQP’s common unitholders’ partners’ capital in its consolidated statement of partners’ capital during the three months ended March 31, 2021 and the remaining $0.2 million of costs are included in general and administrative expenses on CEQP’s consolidated statement of operations for the three months ended March 31, 2021.

Distributions

Crestwood Equity

Limited Partners. A summary of CEQP’s limited partner quarterly cash distributions for the three months ended March 31, 2021 and 2020 is presented below:


Record Date	Payment Date	Per Unit Rate		Cash Distributions (in millions)
2021
February 5, 2021	February 12, 2021	$	0.625	$	46.4



2020
February 7, 2020	February 14, 2020	$	0.625	$	45.3

On April 15, 2021, we declared a distribution of $0.625 per limited partner unit to be paid on May 14, 2021 to unitholders of record on May 7, 2021 with respect to the quarter ended March 31, 2021.

Preferred Unitholders. During the three months ended March 31, 2021 and 2020, we paid cash distributions to our preferred unitholders of approximately $15.0 million in both periods. On April 15, 2021, the board of directors of our general partner authorized a cash distribution to our preferred unitholders of approximately $15.0 million for the quarter ended March 31, 2021.

Crestwood Midstream

During the three months ended March 31, 2021 and 2020, Crestwood Midstream paid cash distributions of $334.0 million and $57.0 million to its partners.

Non-Controlling Partner

Crestwood Niobrara issued preferred interests to CN Jackalope Holdings LLC (Jackalope Holdings), which are reflected as non-controlling interest in subsidiary apart from partners’ capital (i.e., temporary equity) on our consolidated balance sheets. We adjust the carrying amount of our non-controlling interest to its redemption value each period through net income attributable to non-controlling partner.

The following table shows the change in our non-controlling interest in subsidiary at March 31, 2021 and 2020 (in millions):


Balance at December 31, 2020	$	432.7



Distributions to non-controlling partner	(9.3)
Net income attributable to non-controlling partner	10.1
Balance at March 31, 2021	$	433.5


Balance at December 31, 2019	$	426.2
Distributions to non-controlling partner	(9.2)
Net income attributable to non-controlling partner	9.9
Balance at March 31, 2020	$	426.9

In April 2021, Crestwood Niobrara paid cash distributions to Jackalope Holdings of approximately $10.3 million for the quarter ended March 31, 2021.

Other

In February 2021, Crestwood Equity issued 50,000 performance units under the Crestwood Equity Partners LP Long Term Incentive Plan (Crestwood LTIP). The performance units are designed to provide an incentive for continuous employment to certain key employees. 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. As of March 31, 2021, we had total unamortized compensation expense of approximately $1.0 million related to these performance units, which we expect will be amortized during the next three years. During the three months ended March 31, 2021, we recognized compensation expense of less then $0.1 million related to these performance units, which is included in general and administrative expenses on our consolidated statements of operations.

Earnings Per Limited Partner Unit

3 Months Ended

Mar. 31, 2021

Earnings Per Share [Abstract]

Earnings Per Limited Partner Unit

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 three months ended March 31, 2021 and 2020 (in millions):


	Three Months Ended
	March 31,
		2021	2020
Preferred units (1)		7.1	7.1
Crestwood Niobrara’s preferred units(1)		4.2	25.6
Unit-based compensation performance units(1)		0.1	0.5
Subordinated units(1)(2)		0.4	0.4

(1)For additional information regarding the potential conversion/redemption of our preferred units and Crestwood Niobrara’s preferred units to CEQP common units, and of our performance units and subordinated units, see our 2020 Annual Report on Form 10-K.

(2)In conjunction with the Crestwood Holdings Transactions, in March 2021, CEQP retired the subordinated units. For additional information regarding the retirement of the subordinated units, see Note 1 and Note 10.

Segments

3 Months Ended

Mar. 31, 2021

Segment Reporting [Abstract]

Segments

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 (interest and debt expense, net and loss on modification/extinguishment of debt) and depreciation, amortization and accretion expense.

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


		CEQP				CMLP
	Three Months Ended			Three Months Ended
	March 31,			March 31,
		2021		2020		2021		2020
Net loss		$	(38.3)	$	(23.4)	$	(40.4)	$	(25.6)
Add:
Interest and debt expense, net		36.0		32.6		36.0		32.6
Loss on modification/extinguishment of debt		5.5		—		5.5		—
Benefit for income taxes		(0.1)		—		(0.1)		—
Depreciation, amortization and accretion		59.2		56.1		62.8		59.6
EBITDA		$	62.3	$	65.3	$	63.8	$	66.6

The following tables summarize CEQP’s and CMLP’s reportable segment data for the three months ended March 31, 2021 and 2020 (in millions). Intersegment revenues included in the following tables are accounted for as arms-length transactions that apply our revenue recognition policy described in our 2020 Annual Report on Form 10-K. Included in earnings (loss) from unconsolidated affiliates, net below was approximately $129.4 million and $13.8 million of our proportionate share of interest expense, depreciation and amortization expense, goodwill impairments and gains (losses) on long-lived assets, net recorded by our equity investments for the three months ended March 31, 2021 and 2020.

Segment EBITDA Information


	Three Months Ended March 31, 2021
	Gathering and Processing		Storage and Transportation		Marketing, Supply and Logistics		Corporate		Total
Crestwood Midstream
Revenues	$	154.4	$	2.0	$	876.3	$	—	$	1,032.7
Intersegment revenues	105.3		2.4		(107.7)		—		—
Costs of product/services sold	116.5		0.4		696.9		—		813.8
Operations and maintenance expense	21.4		0.6		10.8		—		32.8
General and administrative expense	—		—		—		17.2		17.2
Gain (loss) on long-lived assets, net	(1.5)		—		0.1		—		(1.4)


Loss from unconsolidated affiliates, net	(0.8)		(102.9)		—		—		(103.7)
Crestwood Midstream EBITDA	$	119.5	$	(99.5)	$	61.0	$	(17.2)	$	63.8
Crestwood Equity
General and administrative expense	—		—		—		1.5		1.5

Crestwood Equity EBITDA	$	119.5	$	(99.5)	$	61.0	$	(18.7)	$	62.3


	Three Months Ended March 31, 2020
	Gathering and Processing		Storage and Transportation		Marketing, Supply and Logistics		Corporate		Total
Crestwood Midstream
Revenues	$	214.9	$	3.5	$	509.5	$	—	$	727.9
Intersegment revenues	40.0		2.6		(42.6)		—		—
Costs of product/services sold	108.3		0.2		425.9		—		534.4
Operations and maintenance expense	27.0		1.4		9.2		—		37.6
General and administrative expense	—		—		—		13.5		13.5
Loss on long-lived assets, net	(1.0)		—		—		—		(1.0)
Goodwill impairment	(80.3)		—		—		—		(80.3)

Earnings from unconsolidated affiliates, net	0.8		4.7		—		—		5.5
Crestwood Midstream EBITDA	$	39.1	$	9.2	$	31.8	$	(13.5)	$	66.6
Crestwood Equity
General and administrative expense	—		—		—		1.4		1.4
Other income, net	—		—		—		0.1		0.1
Crestwood Equity EBITDA	$	39.1	$	9.2	$	31.8	$	(14.8)	$	65.3

Other Segment Information


	CEQP				CMLP
	March 31, 2021		December 31, 2020		March 31, 2021		December 31, 2020
Total Assets
Gathering and Processing	$	3,421.9	$	3,464.6	$	3,563.5	$	3,609.7
Storage and Transportation	832.5		944.6		832.5		944.6
Marketing, Supply and Logistics	731.3		805.0		731.3		805.0
Corporate	31.6		29.5		28.1		26.2
Total Assets	$	5,017.3	$	5,243.7	$	5,155.4	$	5,385.5

- 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
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+ Details

Revenues

3 Months Ended

Mar. 31, 2021

Revenue Recognition [Abstract]

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 $223.0 million and $219.9 million for both CEQP and CMLP at March 31, 2021 and December 31, 2020, 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):


	March 31, 2021		December 31, 2020
Contract assets (non-current)	$	1.0	$	1.0
Contract liabilities (current)(1)	$	10.1	$	10.3
Contract liabilities (non-current)(1)	$	176.5	$	172.2

(1)During the three months ended March 31, 2021, we recognized revenues of approximately $3.1 million that were previously included in contract liabilities at December 31, 2020. The remaining change in our contract liabilities during the three months ended March 31, 2021, 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 March 31, 2021 (in millions):


Remainder of 2021	$	69.8
2022	77.0
2023	52.3
2024	31.4
Total	$	230.5

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 three months ended March 31, 2021 and 2020 (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 represents revenues related to our commodity-based derivatives.


	Three Months Ended March 31, 2021
	Gathering and Processing		Storage and Transportation		Marketing, Supply and Logistics		Intersegment Elimination		Total

Topic 606 revenues
Gathering
Natural gas	$	31.4	$	—	$	—	$	—	$	31.4
Crude oil	20.7		—		—		—		20.7
Water	22.0		—		—		—		22.0
Processing
Natural gas	7.0		—		—		—		7.0

Compression
Natural gas	4.7		—		—		—		4.7
Storage
Crude oil	0.1		0.6		—		(0.5)		0.2
NGLs	—		—		3.7		—		3.7
Pipeline
Crude oil	—		1.3		—		(0.5)		0.8

Transportation
Crude oil	0.7		—		—		—		0.7
NGLs	—		—		4.2		—		4.2

Rail Loading
Crude oil	—		2.3		—		(1.3)		1.0

Product Sales
Natural gas	42.8		—		95.6		(42.2)		96.2
Crude oil	90.0		—		251.2		(22.7)		318.5
NGLs	40.3		—		406.0		(40.3)		406.0
Other	—		0.2		0.2		(0.2)		0.2
Total Topic 606 revenues	259.7		4.4		760.9		(107.7)		917.3
Non-Topic 606 revenues	—		—		115.4		—		115.4
Total revenues	$	259.7	$	4.4	$	876.3	$	(107.7)	$	1,032.7


	Three Months Ended March 31, 2020
	Gathering and Processing		Storage and Transportation		Marketing, Supply and Logistics		Intersegment Elimination		Total

Topic 606 revenues
Gathering
Natural gas	$	43.8	$	—	$	—	$	—	$	43.8
Crude oil	26.5		—		—		—		26.5
Water	23.0		—		—		—		23.0
Processing
Natural gas	10.2		—		—		—		10.2

Compression
Natural gas	6.3		—		—		—		6.3
Storage
Crude oil	0.5		0.6		—		(0.4)		0.7
NGLs	—		—		1.6		—		1.6
Pipeline
Crude oil	—		1.6		—		(0.5)		1.1
Transportation
Crude oil	2.0		—		1.6		—		3.6
NGLs	—		—		1.7		—		1.7

Rail Loading
Crude oil	—		3.4		—		(1.4)		2.0

Product Sales
Natural gas	12.0		—		18.3		(11.7)		18.6
Crude oil	121.1		—		250.2		(16.3)		355.0
NGLs	9.5		—		160.3		(11.9)		157.9
Other	—		0.5		0.5		(0.4)		0.6
Total Topic 606 revenues	254.9		6.1		434.2		(42.6)		652.6
Non-Topic 606 revenues	—		—		75.3		—		75.3
Total revenues	$	254.9	$	6.1	$	509.5	$	(42.6)	$	727.9

- 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
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-Section 50
-Paragraph 10
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+ Details

Related Party Transactions

3 Months Ended

Mar. 31, 2021

Related Party Transactions

Related Party TransactionsCrestwood 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 product purchases, marketing services and various operating agreements. We also enter into transactions with our affiliates related to services provided on our expansion projects. During the three months ended March 31, 2021 and 2020, we paid approximately $0.3 million and $2.4 million of capital expenditures to Applied Consultants, Inc., an affiliate of Crestwood Holdings.

The following table shows transactions with our affiliates which are reflected in our consolidated statements of operations (in millions). For a further description of our related party agreements, see our 2020 Annual Report on Form 10-K.


	Three Months Ended
	March 31,
		2021		2020
Revenues at CEQP and CMLP(1)		$	4.9	$	7.5
Costs of product/services sold at CEQP and CMLP(2)		$	41.1	$	3.2
Operations and maintenance expenses charged by CEQP and CMLP(3)		$	5.7	$	6.2
General and administrative expenses charged by CEQP to CMLP, net(4)		$	5.9	$	7.1
General and administrative expenses at CEQP charged to Crestwood Holdings, net(5)		$	4.8	$	12.8

(1)Relates to the sale of NGLs to a subsidiary of Crestwood Permian.

(2)Includes (i) $30.3 million and $3.2 million during the three months ended March 31, 2021 and 2020 related to purchases of natural gas and NGLs from a subsidiary of Crestwood Permian; and (ii) $10.8 million during the three months ended March 31, 2021 related to purchases of natural gas from a subsidiary of Tres Holdings.

(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, and these charges are reflected as a reduction of operations and maintenance expenses in our consolidated statements of operations. During the three months ended March 31, 2021, we charged $1.7 million to Stagecoach Gas, $1.2 million to Tres Holdings, and $2.8 million to Crestwood Permian. During the three months ended March 31, 2020, we charged $1.7 million to Stagecoach Gas, $1.1 million to Tres Holdings, and $3.4 million to Crestwood Permian.

(4)Includes $6.9 million and $8.2 million of unit-based compensation charges allocated from CEQP to CMLP for the three months ended March 31, 2021 and 2020. In addition, includes $1.0 million and $1.1 million of CMLP’s general and administrative costs allocated to CEQP during the three months ended March 31, 2021 and 2020.

(5)Includes a $4.6 million and $12.6 million reduction of unit-based compensation charges allocated from Crestwood Holdings to CEQP and CMLP during the three months ended March 31, 2021 and 2020. In addition, includes $0.2 million of CEQP’s general and administrative costs allocated to Crestwood Holdings during both the three months ended March 31, 2021 and 2020.

The following table shows accounts receivable and accounts payable with our affiliates (in millions):


	March 31, 2021		December 31, 2020
Accounts receivable at CEQP and CMLP	$	8.1	$	2.5
Accounts payable at CEQP(1)	$	15.4	$	7.5
Accounts payable at CMLP	$	15.4	$	5.0

(1)In conjunction with the Crestwood Holdings Transactions discussed in Note 1, CEQP eliminated approximately $2.6 million of accounts payable to Crestwood Holdings which is reflected as an increase to CEQP’s common unitholders’ partners’ capital in its consolidated statement of partners’ capital during the three months ended March 31, 2021.

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2021
Accounting Policies [Abstract]
Basis of Accounting, Policy	Significant Accounting Policies There were no material changes in our significant accounting policies from those described in our 2020 Annual Report on Form 10-K. During the three months ended March 31, 2020, we recorded an $80.3 million full impairment of the goodwill associated with our Powder River Basin reporting unit based on events that occurred during 2020 which resulted in a significant decrease in the forecasted cash flows and fair value of the reporting unit. For a further discussion of this goodwill impairment, see our 2020 Annual Report on Form 10-K.

Certain Balance Sheet Information (Tables)

3 Months Ended

Mar. 31, 2021

Balance Sheet Related Disclosures [Abstract]

Schedule of Accrued Liabilities

Accrued expenses and other liabilities consisted of the following (in millions):


	CEQP				CMLP
	March 31,		December 31,		March 31,		December 31,
	2021		2020		2021		2020
Accrued expenses	$	41.7	$	48.3	$	36.6	$	46.4
Accrued property taxes	5.2		8.4		5.2		8.4
Income tax payable	0.3		0.2		0.3		0.2
Interest payable	47.0		24.9		47.0		24.9
Accrued additions to property, plant and equipment	12.2		12.3		12.2		12.3
Operating leases	12.5		14.7		12.5		14.7
Finance leases	2.9		2.9		2.9		2.9
Deferred revenue	10.1		10.3		10.1		10.3

Total accrued expenses and other liabilities	$	131.9	$	122.0	$	126.8	$	120.1

Schedule of Other Long-Term Liabilities

Other long-term liabilities consisted of the following (in millions):


	CEQP				CMLP
	March 31,		December 31,		March 31,		December 31,
	2021		2020		2021		2020
Contract liabilities	$	176.5	$	172.2	$	176.5	$	172.2
Operating leases	25.9		28.5		25.9		28.5
Asset retirement obligations	34.6		34.1		34.6		34.1
Other	18.2		18.5		16.4		17.0
Total other long-term liabilities	$	255.2	$	253.3	$	253.4	$	251.8

Investments in Unconsolidated Affiliates (Tables)

3 Months Ended

Mar. 31, 2021

Equity Method Investments and Joint Ventures [Abstract]

Equity Method Investments

Net Investments and Earnings (Loss)

Our net investments in and earnings from our unconsolidated affiliates are as follows (in millions):


	Investment				Earnings (Loss) from Unconsolidated Affiliates
						Three Months Ended
	March 31,		December 31,		March 31,
	2021		2020			2021		2020
Stagecoach Gas Services LLC(1)	$	666.2	$	792.5		$	(112.3)	$	9.2
Tres Palacios Holdings LLC(2)	51.7		35.5			9.3		—
Powder River Basin Industrial Complex, LLC(3)	3.6		3.6			0.1		(4.5)
Crestwood Permian Basin Holdings LLC(4)	111.3		112.1			(0.8)		0.8
Total	$	832.8	$	943.7		$	(103.7)	$	5.5

Summarized Financial Information of Unconsolidated Affiliates

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


	Three Months Ended
	March 31,
	2021						2020
	Operating Revenues		Operating Expenses		Net Income (Loss)		Operating Revenues		Operating Expenses		Net Income (Loss)
Stagecoach Gas	$	35.9	$	363.3	$	(327.4)	$	37.7	$	19.4	$	18.4


Other(1)	76.9		60.4		16.5		28.3		48.5		(19.5)
Total	$	112.8	$	423.7	$	(310.9)	$	66.0	$	67.9	$	(1.1)

(1)Includes our Tres Holdings, PRBIC and Crestwood Permian equity investments.

Distributions and Contributions

The following table summarizes our distributions from and contributions to our unconsolidated affiliates (in millions):


	Distributions(1)				Contributions
	Three Months Ended				Three Months Ended
	March 31,				March 31,
	2021		2020		2021		2020
Stagecoach Gas	$	14.0	$	15.6	$	—	$	—
Tres Holdings	—		—		6.9		6.0
PRBIC	0.1		0.1		—		—
Crestwood Permian	3.3		3.8		3.3		—
Total	$	17.4	$	19.5	$	10.2	$	6.0

(1) In April 2021, we received cash distributions from Stagecoach Gas, Tres Holdings and Crestwood Permian of approximately $13.0 million, $10.6 million and $2.2 million, respectively.

Risk Management (Tables)

3 Months Ended

Mar. 31, 2021

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

Summary of Commodity-Based Derivatives

The following table summarizes the impact to our consolidated statements of operations related to our commodity-based derivatives during the three months ended March 31, 2021 and 2020 (in millions):


	Three Months Ended
	March 31,
		2021		2020
Product revenues		$	114.8	$	75.0
Gain (loss) reflected in product costs		$	(8.1)	$	22.0

Notional Amounts And Terms Of Company's Derivative Financial Instruments

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


	March 31, 2021		December 31, 2020
	Fixed Price Payor	Fixed Price Receiver	Fixed Price Payor	Fixed Price Receiver
Propane, ethane, butane, heating oil and crude oil (MMBbls)	60.8	62.9	72.7	76.5
Natural gas (Bcf)	27.3	36.6	22.6	28.6

Schedule of Derivative Instruments

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


	March 31, 2021		December 31, 2020
Aggregate fair value liability of derivative instruments with credit-risk-related contingent features(1)	$	30.7	$	38.5
NYMEX-related net derivative asset position	$	57.4	$	35.9
NYMEX-related cash collateral received	$	40.0	$	18.3
Cash collateral received, net	$	7.3	$	12.4

(1)At March 31, 2021 and December 31, 2020, we posted $1.0 million and less than $0.1 million of collateral associated with these derivatives.

Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2021

Fair Value Disclosures [Abstract]

Assets And Liabilities Measured At Fair Value On Recurring Basis


	March 31, 2021

	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	$	20.9	$	531.6	$	—	$	552.5	$	(492.0)	$	(39.5)	$	21.0
Suburban Propane Partners, L.P. units(2)	2.1		—		—		2.1		—		—		2.1
Total assets at fair value	$	23.0	$	531.6	$	—	$	554.6	$	(492.0)	$	(39.5)	$	23.1

Liabilities
Liabilities from price risk management	$	23.6	$	522.2	$	—	$	545.8	$	(492.0)	$	7.8	$	61.6
Total liabilities at fair value	$	23.6	$	522.2	$	—	$	545.8	$	(492.0)	$	7.8	$	61.6

	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

(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 non-current assets on CEQP’s consolidated balance sheets.

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):


	March 31, 2021				December 31, 2020
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
2023 Senior Notes	$	286.8	$	288.1	$	683.8	$	691.5
2025 Senior Notes	$	495.8	$	502.8	$	495.5	$	509.9
2027 Senior Notes	$	593.4	$	589.3	$	593.2	$	594.1
2029 Senior Notes	$	689.9	$	690.4	$	—	$	—

Long-Term Debt (Tables)

3 Months Ended

Mar. 31, 2021

Debt Disclosure [Abstract]

Components Of Long-Term Debt

Long-term debt consisted of the following at March 31, 2021 and December 31, 2020 (in millions):


	March 31, 2021		December 31, 2020
Credit Facility	$	530.0	$	719.0
2023 Senior Notes	288.0		687.2
2025 Senior Notes	500.0		500.0
2027 Senior Notes	600.0		600.0
2029 Senior Notes	700.0		—
Other(1)	0.4		0.4
Less: deferred financing costs, net	30.0		22.6
Total debt	2,588.4		2,484.0
Less: current portion	0.2		0.2
Total long-term debt, less current portion	$	2,588.2	$	2,483.8

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

- 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.

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+ Details

Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2021

Commitments and Contingencies Disclosure [Abstract]

Summary of Self-Insurance Reserves

The following table summarizes CEQP’s and CMLP’s self-insurance reserves at March 31, 2021 and December 31, 2020 (in millions):


	CEQP				CMLP
	March 31, 2021		December 31, 2020		March 31, 2021		December 31, 2020
Self-insurance reserves(1)	$	7.3	$	7.7	$	6.4	$	6.7

(1)At March 31, 2021, 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.

Leases (Tables)

3 Months Ended

Mar. 31, 2021

Leases [Abstract]

Summary of Balance Sheet Information Related to Operating and Finance Leases

The following table summarizes the balance sheet information related to our operating and finance leases at March 31, 2021 and December 31, 2020 (in millions):


	March 31, 2021		December 31, 2020
Operating Leases
Operating lease right-of-use assets, net	$	32.4	$	36.8

Accrued expenses and other liabilities	$	12.5	$	14.7
Other long-term liabilities	25.9		28.5
Total operating lease liabilities	$	38.4	$	43.2
Finance Leases
Property, plant and equipment	$	13.0	$	13.3
Less: accumulated depreciation	8.4		7.9
Property, plant and equipment, net	$	4.6	$	5.4

Accrued expenses and other liabilities	$	2.9	$	2.9
Other long-term liabilities	1.3		1.9
Total finance lease liabilities	$	4.2	$	4.8

Partners' Capital (Tables)

3 Months Ended

Mar. 31, 2021

Statement of Partners' Capital [Abstract]

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

A summary of CEQP’s limited partner quarterly cash distributions for the three months ended March 31, 2021 and 2020 is presented below:


Record Date	Payment Date	Per Unit Rate		Cash Distributions (in millions)
2021
February 5, 2021	February 12, 2021	$	0.625	$	46.4



2020
February 7, 2020	February 14, 2020	$	0.625	$	45.3

Summary of Change in Non-Controlling Interest in Subsidiary

The following table shows the change in our non-controlling interest in subsidiary at March 31, 2021 and 2020 (in millions):


Balance at December 31, 2020	$	432.7



Distributions to non-controlling partner	(9.3)
Net income attributable to non-controlling partner	10.1
Balance at March 31, 2021	$	433.5


Balance at December 31, 2019	$	426.2
Distributions to non-controlling partner	(9.2)
Net income attributable to non-controlling partner	9.9
Balance at March 31, 2020	$	426.9

Earnings Per Limited Partner Unit (Tables)

3 Months Ended

Mar. 31, 2021

Earnings Per Share [Abstract]

Summary of Weighted-Average Units Excluded and Basic and Diluted Limited Partner Units

The following table summarizes information regarding the weighted-average of common units excluded during the three months ended March 31, 2021 and 2020 (in millions):


	Three Months Ended
	March 31,
		2021	2020
Preferred units (1)		7.1	7.1
Crestwood Niobrara’s preferred units(1)		4.2	25.6
Unit-based compensation performance units(1)		0.1	0.5
Subordinated units(1)(2)		0.4	0.4

Segments (Tables)

3 Months Ended

Mar. 31, 2021

Segment Reporting, Other Significant Reconciling Item [Line Items]

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

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


		CEQP				CMLP
	Three Months Ended			Three Months Ended
	March 31,			March 31,
		2021		2020		2021		2020
Net loss		$	(38.3)	$	(23.4)	$	(40.4)	$	(25.6)
Add:
Interest and debt expense, net		36.0		32.6		36.0		32.6
Loss on modification/extinguishment of debt		5.5		—		5.5		—
Benefit for income taxes		(0.1)		—		(0.1)		—
Depreciation, amortization and accretion		59.2		56.1		62.8		59.6
EBITDA		$	62.3	$	65.3	$	63.8	$	66.6

Summary Of Segment Information

Crestwood Midstream Partners LP

Segment Reporting, Other Significant Reconciling Item [Line Items]

Summary Of Segment Information


	Three Months Ended March 31, 2021
	Gathering and Processing		Storage and Transportation		Marketing, Supply and Logistics		Corporate		Total
Crestwood Midstream
Revenues	$	154.4	$	2.0	$	876.3	$	—	$	1,032.7
Intersegment revenues	105.3		2.4		(107.7)		—		—
Costs of product/services sold	116.5		0.4		696.9		—		813.8
Operations and maintenance expense	21.4		0.6		10.8		—		32.8
General and administrative expense	—		—		—		17.2		17.2
Gain (loss) on long-lived assets, net	(1.5)		—		0.1		—		(1.4)


Loss from unconsolidated affiliates, net	(0.8)		(102.9)		—		—		(103.7)
Crestwood Midstream EBITDA	$	119.5	$	(99.5)	$	61.0	$	(17.2)	$	63.8
Crestwood Equity
General and administrative expense	—		—		—		1.5		1.5

Crestwood Equity EBITDA	$	119.5	$	(99.5)	$	61.0	$	(18.7)	$	62.3


	Three Months Ended March 31, 2020
	Gathering and Processing		Storage and Transportation		Marketing, Supply and Logistics		Corporate		Total
Crestwood Midstream
Revenues	$	214.9	$	3.5	$	509.5	$	—	$	727.9
Intersegment revenues	40.0		2.6		(42.6)		—		—
Costs of product/services sold	108.3		0.2		425.9		—		534.4
Operations and maintenance expense	27.0		1.4		9.2		—		37.6
General and administrative expense	—		—		—		13.5		13.5
Loss on long-lived assets, net	(1.0)		—		—		—		(1.0)
Goodwill impairment	(80.3)		—		—		—		(80.3)

Earnings from unconsolidated affiliates, net	0.8		4.7		—		—		5.5
Crestwood Midstream EBITDA	$	39.1	$	9.2	$	31.8	$	(13.5)	$	66.6
Crestwood Equity
General and administrative expense	—		—		—		1.4		1.4
Other income, net	—		—		—		0.1		0.1
Crestwood Equity EBITDA	$	39.1	$	9.2	$	31.8	$	(14.8)	$	65.3

Other Segment Information


	CEQP				CMLP
	March 31, 2021		December 31, 2020		March 31, 2021		December 31, 2020
Total Assets
Gathering and Processing	$	3,421.9	$	3,464.6	$	3,563.5	$	3,609.7
Storage and Transportation	832.5		944.6		832.5		944.6
Marketing, Supply and Logistics	731.3		805.0		731.3		805.0
Corporate	31.6		29.5		28.1		26.2
Total Assets	$	5,017.3	$	5,243.7	$	5,155.4	$	5,385.5

Revenue Recognition (Tables)

3 Months Ended

Mar. 31, 2021

Revenue Recognition [Abstract]

Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]

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


	March 31, 2021		December 31, 2020
Contract assets (non-current)	$	1.0	$	1.0
Contract liabilities (current)(1)	$	10.1	$	10.3
Contract liabilities (non-current)(1)	$	176.5	$	172.2

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]

The following table summarizes the transaction price allocated to our remaining performance obligations under certain contracts that have not been recognized as of March 31, 2021 (in millions):


Remainder of 2021	$	69.8
2022	77.0
2023	52.3
2024	31.4
Total	$	230.5

Disaggregation of Revenue

Disaggregation of Revenues


	Three Months Ended March 31, 2021
	Gathering and Processing		Storage and Transportation		Marketing, Supply and Logistics		Intersegment Elimination		Total

Topic 606 revenues
Gathering
Natural gas	$	31.4	$	—	$	—	$	—	$	31.4
Crude oil	20.7		—		—		—		20.7
Water	22.0		—		—		—		22.0
Processing
Natural gas	7.0		—		—		—		7.0

Compression
Natural gas	4.7		—		—		—		4.7
Storage
Crude oil	0.1		0.6		—		(0.5)		0.2
NGLs	—		—		3.7		—		3.7
Pipeline
Crude oil	—		1.3		—		(0.5)		0.8

Transportation
Crude oil	0.7		—		—		—		0.7
NGLs	—		—		4.2		—		4.2

Rail Loading
Crude oil	—		2.3		—		(1.3)		1.0

Product Sales
Natural gas	42.8		—		95.6		(42.2)		96.2
Crude oil	90.0		—		251.2		(22.7)		318.5
NGLs	40.3		—		406.0		(40.3)		406.0
Other	—		0.2		0.2		(0.2)		0.2
Total Topic 606 revenues	259.7		4.4		760.9		(107.7)		917.3
Non-Topic 606 revenues	—		—		115.4		—		115.4
Total revenues	$	259.7	$	4.4	$	876.3	$	(107.7)	$	1,032.7


	Three Months Ended March 31, 2020
	Gathering and Processing		Storage and Transportation		Marketing, Supply and Logistics		Intersegment Elimination		Total

Topic 606 revenues
Gathering
Natural gas	$	43.8	$	—	$	—	$	—	$	43.8
Crude oil	26.5		—		—		—		26.5
Water	23.0		—		—		—		23.0
Processing
Natural gas	10.2		—		—		—		10.2

Compression
Natural gas	6.3		—		—		—		6.3
Storage
Crude oil	0.5		0.6		—		(0.4)		0.7
NGLs	—		—		1.6		—		1.6
Pipeline
Crude oil	—		1.6		—		(0.5)		1.1
Transportation
Crude oil	2.0		—		1.6		—		3.6
NGLs	—		—		1.7		—		1.7

Rail Loading
Crude oil	—		3.4		—		(1.4)		2.0

Product Sales
Natural gas	12.0		—		18.3		(11.7)		18.6
Crude oil	121.1		—		250.2		(16.3)		355.0
NGLs	9.5		—		160.3		(11.9)		157.9
Other	—		0.5		0.5		(0.4)		0.6
Total Topic 606 revenues	254.9		6.1		434.2		(42.6)		652.6
Non-Topic 606 revenues	—		—		75.3		—		75.3
Total revenues	$	254.9	$	6.1	$	509.5	$	(42.6)	$	727.9

Related Party Transactions (Tables)

3 Months Ended

Mar. 31, 2021

Schedule of Related Party Transactions


	Three Months Ended
	March 31,
		2021		2020
Revenues at CEQP and CMLP(1)		$	4.9	$	7.5
Costs of product/services sold at CEQP and CMLP(2)		$	41.1	$	3.2
Operations and maintenance expenses charged by CEQP and CMLP(3)		$	5.7	$	6.2
General and administrative expenses charged by CEQP to CMLP, net(4)		$	5.9	$	7.1
General and administrative expenses at CEQP charged to Crestwood Holdings, net(5)		$	4.8	$	12.8

(1)Relates to the sale of NGLs to a subsidiary of Crestwood Permian.

The following table shows accounts receivable and accounts payable with our affiliates (in millions):


	March 31, 2021		December 31, 2020
Accounts receivable at CEQP and CMLP	$	8.1	$	2.5
Accounts payable at CEQP(1)	$	15.4	$	7.5
Accounts payable at CMLP	$	15.4	$	5.0

Organization and Business Description (Details) shares in Millions, $ in Millions	1 Months Ended	3 Months Ended
	Mar. 31, 2021 USD ($) shares	Mar. 31, 2021 segment
Partnership Organization And Basis Of Presentation [Line Items]
Number of Operating Segments \| segment		3
Cash Paid to Repurchase Common Stock \| $	$ 268
Common Units
Partnership Organization And Basis Of Presentation [Line Items]
Stock Repurchased and Retired During Period, Shares	11.5
Subordinated Units
Partnership Organization And Basis Of Presentation [Line Items]
Stock Repurchased and Retired During Period, Shares	0.4
Crestwood Midstream Partners LP \| Crestwood Gas Services GP, LLC
Partnership Organization And Basis Of Presentation [Line Items]
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest		0.10%
Crestwood Midstream Partners LP \| Crestwood Equity Partners LP
Partnership Organization And Basis Of Presentation [Line Items]
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest		99.90%
Crestwood Holdings LP \| Crestwood Equity Partners LP
Partnership Organization And Basis Of Presentation [Line Items]
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest		99.00%
Crestwood Holdings LP \| Crestwood Gas Services Holdings LLC
Partnership Organization And Basis Of Presentation [Line Items]
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest		1.00%

Basis of Presentation and Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Summary Of Significant Accounting Policies [Line Items]
Goodwill impairment	$ 0.0	$ 80.3
Powder River Basin [Member]
Summary Of Significant Accounting Policies [Line Items]
Goodwill impairment		$ 80.3

Certain Balance Sheet Information (Accrued Expenses and Other Liabilities) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Accrued Expenses and Other Liabilities [Line Items]
Accrued expenses	$ 41.7	$ 48.3
Accrued property taxes	5.2	8.4
Income tax payable	0.3	0.2
Interest payable	47.0	24.9
Accrued additions to property, plant and equipment	12.2	12.3
Operating leases	12.5	14.7
Finance leases	2.9	2.9
Deferred revenue	10.1	10.3
Total accrued expenses and other liabilities	131.9	122.0
Contract liabilities	176.5	172.2
Operating leases	25.9	28.5
Asset retirement obligations	34.6	34.1
Other long-term liabilities	255.2	253.3
Other
Accrued Expenses and Other Liabilities [Line Items]
Other long-term liabilities	18.2	18.5
Crestwood Midstream Partners LP
Accrued Expenses and Other Liabilities [Line Items]
Accrued expenses	36.6	46.4
Accrued property taxes	5.2	8.4
Income tax payable	0.3	0.2
Interest payable	47.0	24.9
Accrued additions to property, plant and equipment	12.2	12.3
Operating leases	12.5	14.7
Finance leases	2.9	2.9
Deferred revenue	10.1	10.3
Total accrued expenses and other liabilities	126.8	120.1
Contract liabilities	176.5	172.2
Operating leases	25.9	28.5
Asset retirement obligations	34.6	34.1
Other long-term liabilities	253.4	251.8
Crestwood Midstream Partners LP \| Other
Accrued Expenses and Other Liabilities [Line Items]
Other long-term liabilities	$ 16.4	$ 17.0

Investments in Unconsolidated Affiliates (Net Investments In and Earnings (Loss) from Unconsolidated Affiliates) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Investment	$ 832.8		$ 943.7
Earnings (loss) from unconsolidated affiliates, net	(103.7)	$ 5.5
Stagecoach Gas Services LLC
Schedule of Equity Method Investments [Line Items]
Investment	666.2		792.5
Earnings (loss) from unconsolidated affiliates, net	(112.3)	9.2
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]
Earnings (loss) from unconsolidated affiliates, net	$ 119.9
Crestwood Permian Basin Holdings LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage	50.00%
Investment	$ 111.3		112.1
Earnings (loss) from unconsolidated affiliates, net	(0.8)	0.8
Difference between carrying amount and underlying equity	8.3
Tres Palacios Holdings LLC
Schedule of Equity Method Investments [Line Items]
Investment	51.7		35.5
Earnings (loss) from unconsolidated affiliates, net	9.3	0.0
Difference between carrying amount and underlying equity	22.4
Powder River Basin Industrial Complex, LLC
Schedule of Equity Method Investments [Line Items]
Investment	3.6		$ 3.6
Earnings (loss) from unconsolidated affiliates, net	$ 0.1	(4.5)
Difference between carrying amount and underlying equity		5.5
Powder River Basin Industrial Complex, LLC \| Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule of Equity Method Investments [Line Items]
Earnings (loss) from unconsolidated affiliates, net		$ 4.5

Investments in Unconsolidated Affiliates (Summarized Financial Information) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Schedule of Equity Method Investments [Line Items]
Operating Revenues	$ 1,032.7	$ 727.9
Operating Expenses	112.1	189.9
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(38.3)	(23.4)
Tres Palacios Holdings LLC
Schedule of Equity Method Investments [Line Items]
Amortization	0.3	0.3
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule of Equity Method Investments [Line Items]
Operating Revenues	112.8	66.0
Operating Expenses	423.7	67.9
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(310.9)	(1.1)
Equity Method Investment, Nonconsolidated Investee or Group of Investees \| Stagecoach Gas Services LLC
Schedule of Equity Method Investments [Line Items]
Operating Revenues	35.9	37.7
Operating Expenses	363.3	19.4
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(327.4)	18.4
Equity Method Investment, Nonconsolidated Investee or Group of Investees \| Other Equity Method Investments
Schedule of Equity Method Investments [Line Items]
Operating Revenues	76.9	28.3
Operating Expenses	60.4	48.5
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 16.5	$ (19.5)

- Definition

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

+ References

+ Details

- 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
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-Subparagraph (b)
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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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
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-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
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-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
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-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
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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
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-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(1))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

+ Details

Investments in Unconsolidated Affiliates (Distributions and Contributions) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Apr. 30, 2021	Mar. 31, 2021	Mar. 31, 2020
Schedule of Equity Method Investments [Line Items]
Proceeds from equity method investments		$ 17.4	$ 19.5
Payments to acquire equity method investments		10.2	6.0
Stagecoach Gas Services LLC
Schedule of Equity Method Investments [Line Items]
Proceeds from equity method investments		14.0	15.6
Payments to acquire equity method investments		0.0	0.0
Crestwood Permian Basin Holdings LLC
Schedule of Equity Method Investments [Line Items]
Proceeds from equity method investments		3.3	3.8
Payments to acquire equity method investments		3.3	0.0
Tres Palacios Holdings LLC
Schedule of Equity Method Investments [Line Items]
Proceeds from equity method investments		0.0	0.0
Payments to acquire equity method investments		6.9	6.0
Powder River Basin Industrial Complex, LLC
Schedule of Equity Method Investments [Line Items]
Proceeds from equity method investments		0.1	0.1
Payments to acquire equity method investments		$ 0.0	$ 0.0
Subsequent Event \| Stagecoach Gas Services LLC
Schedule of Equity Method Investments [Line Items]
Proceeds from equity method investments	$ 13.0
Subsequent Event \| Crestwood Permian Basin Holdings LLC
Schedule of Equity Method Investments [Line Items]
Proceeds from equity method investments	2.2
Subsequent Event \| Tres Palacios Holdings LLC
Schedule of Equity Method Investments [Line Items]
Proceeds from equity method investments	$ 10.6

Investments in Unconsolidated Affiliates (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Contingent consideration, current portion	$ 19.0		$ 19.0
Contingent consideration	19.0		38.0
Purchases of property, plant and equipment	9.3	$ 86.8
Interest Payable, Current	1.0
Crestwood Permian Basin Holdings LLC
Schedule of Equity Method Investments [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 10.0
Ownership percentage	50.00%
Stagecoach Gas Services LLC
Schedule of Equity Method Investments [Line Items]
Business Combination, Contingent Consideration, Liability	$ 38.0		57.0
Payment for Contingent Consideration Liability, Operating Activities	$ 19.0
Crestwood Equity Partners LP \| Crestwood Permian Basin Holdings
Schedule of Equity Method Investments [Line Items]
Ownership percentage	50.00%
Crestwood Midstream Partners LP
Schedule of Equity Method Investments [Line Items]
Contingent consideration, current portion	$ 19.0		19.0
Contingent consideration	19.0		$ 38.0
Purchases of property, plant and equipment	$ 9.3	$ 86.8

Risk Management (Risk Management Activities) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Product revenues	$ 114.8	$ 75.0
Commodity contract
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments not designated as hedging	$ (8.1)	$ 22.0

Risk Management (Notional Amounts and Terms of Company's Derivative Financial Instruments) (Details) bcf in Millions, MMBbls in Millions	Mar. 31, 2021 MMBbls bcf	Dec. 31, 2020 MMBbls bcf
Propane, ethane, butane, heating oil and crude oil (MMBbls) \| Fixed Price Payor
Derivative [Line Items]
Derivative, notional amount \| MMBbls	60.8	72.7
Propane, ethane, butane, heating oil and crude oil (MMBbls) \| Fixed Price Receiver
Derivative [Line Items]
Derivative, notional amount \| MMBbls	62.9	76.5
Natural gas (Bcf) \| Fixed Price Payor
Derivative [Line Items]
Derivative, notional amount \| bcf	27.3	22.6
Natural gas (Bcf) \| Fixed Price Receiver
Derivative [Line Items]
Derivative, notional amount \| bcf	36.6	28.6

Risk Management (Schedule of Derivative Instruments in Statement of Financial Position, Fair Value) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Collateral posted for commodity derivative instruments	$ 7.3	$ 12.4
Commodity contract
Derivative [Line Items]
Collateral posted for commodity derivative instruments	1.0	0.1
NYMEX Derivative Liability
Derivative [Line Items]
Derivative Asset	57.4
Derivative Liability		35.9
NYMEX Margin Deposit
Derivative [Line Items]
NYMEX margin deposits	40.0	18.3
Commodity contract with credit contingent features
Derivative [Line Items]
Aggregate fair value of commodity derivative instruments	$ 30.7	$ 38.5

Risk Management (Narrative) (Details) - Price Risk Contracts Member - Maximum	3 Months Ended
	Mar. 31, 2021
Derivative [Line Items]
Remaining maturity	38 months
Percent of contracts expiring in the next twelve months	86.00%

Fair Value Measurements (Schedule of Carrying Values and Estimated Fair Values of Senior Notes) (Details) - Crestwood Midstream Partners LP - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
2023 Senior Notes
Debt Instrument [Line Items]
Carrying Amount	$ 286.8	$ 683.8
Fair Value	288.1	691.5
2025 Senior Notes
Debt Instrument [Line Items]
Carrying Amount	495.8	495.5
Fair Value	502.8	509.9
2027 Senior Notes
Debt Instrument [Line Items]
Carrying Amount	593.4	593.2
Fair Value	589.3	594.1
Senior Notes, 2029
Debt Instrument [Line Items]
Carrying Amount	689.9	0.0
Fair Value	$ 690.4	$ 0.0

Fair Value Measurements (Assets And Liabilities Measured At Fair Value On Recurring Basis) (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets from price risk management	$ 552.5	$ 500.7
SPH units	2.1	2.1
Assets, Fair Value Disclosure, Excluding Netting Adjustments	554.6	502.8
Netting agreements	(492.0)	(455.0)
Assets, Collateral/Margin Received or Paid	(39.5)	(18.5)
Assets from price risk management, total	21.0	27.2
Total assets at fair value	23.1	29.3
Liabilities from price risk management	545.8	519.1
Liabilities, Fair Value Disclosure, Excluding Netting Adjustments	545.8	519.1
Netting agreements	(492.0)	(455.0)
Liabilities, Collateral/Margin Received or Paid	7.8	12.2
Liabilities from price risk management, total	61.6	76.3
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets from price risk management	20.9	20.2
SPH units	2.1	2.1
Assets, Fair Value Disclosure, Excluding Netting Adjustments	23.0	22.3
Liabilities from price risk management	23.6	25.1
Liabilities, Fair Value Disclosure, Excluding Netting Adjustments	23.6	25.1
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets from price risk management	531.6	480.5
SPH units	0.0	0.0
Assets, Fair Value Disclosure, Excluding Netting Adjustments	531.6	480.5
Liabilities from price risk management	522.2	494.0
Liabilities, Fair Value Disclosure, Excluding Netting Adjustments	522.2	494.0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
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 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	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Less: deferred financing costs, net	$ 30.0	$ 22.6
Total debt	2,588.4	2,484.0
Less: current portion	0.2	0.2
Total long-term debt, less current portion	2,588.2	2,483.8
Senior Notes \| 2023 Senior Notes
Debt Instrument [Line Items]
Senior notes	288.0	687.2
Senior Notes \| 2025 Senior Notes
Debt Instrument [Line Items]
Senior notes	500.0	500.0
Senior Notes \| 2027 Senior Notes
Debt Instrument [Line Items]
Senior notes	600.0	600.0
Senior Notes \| Senior Notes, 2029
Debt Instrument [Line Items]
Senior notes	700.0	0.0
Other(1)
Debt Instrument [Line Items]
Other(1)	0.4	0.4
Revolving Credit Facility \| Crestwood Midstream Revolver
Debt Instrument [Line Items]
Credit Facility	$ 530.0	$ 719.0

Long-Term Debt (Narrative) (Details)	1 Months Ended		3 Months Ended
Long-Term Debt (Narrative) (Details)	Apr. 30, 2021 USD ($)	Jan. 31, 2021 USD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Senior Secured Leverage Ratio, maximum			3.75
Senior Secured Leverage Ratio			0.85
Extinguishment of Debt, Amount		$ 399,200,000
Loss on modification/extinguishment of debt			$ 5,500,000	$ 0
Interest Paid, Including Capitalized Interest, Operating and Investing Activities			7,600,000
Crestwood Midstream Partners LP
Debt Instrument [Line Items]
Loss on modification/extinguishment of debt			5,500,000	$ 0
2027 Senior Notes \| Crestwood Midstream Partners LP
Debt Instrument [Line Items]
Senior notes			593,400,000		$ 593,200,000
2025 Senior Notes \| Crestwood Midstream Partners LP
Debt Instrument [Line Items]
Senior notes			$ 495,800,000		495,500,000
Crestwood Midstream Revolver
Debt Instrument [Line Items]
Consolidated Leverage Ratio Maximum			5.50
Crestwood Midstream Revolver \| Revolving Credit Facility
Debt Instrument [Line Items]
Available capacity			$ 701,200,000
Letters of credit outstanding			$ 18,800,000		$ 23,900,000
Debt, Weighted Average Interest Rate			3.29%		2.45%
Interest Coverage Ratio Minimum			2.50
Total Funded Debt to Consolidated Ebitda			4.21
Consolidated Ebitda To Consolidated Interest Expense			4.74
Crestwood Midstream Revolver \| Revolving Credit Facility \| Minimum
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate			2.36%		2.40%
Crestwood Midstream Revolver \| Revolving Credit Facility \| Maximum
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate			4.50%		4.50%
2023 Senior Notes \| Crestwood Midstream Partners LP
Debt Instrument [Line Items]
Senior notes			$ 286,800,000		$ 683,800,000
Senior Notes \| 2027 Senior Notes
Debt Instrument [Line Items]
Senior notes			600,000,000.0		600,000,000.0
Senior Notes \| 2025 Senior Notes
Debt Instrument [Line Items]
Senior notes			500,000,000.0		500,000,000.0
Senior Notes \| 2023 Senior Notes
Debt Instrument [Line Items]
Senior notes			288,000,000.0		$ 687,200,000
Senior Notes \| Senior Notes, due 2029
Debt Instrument [Line Items]
Senior notes		$ 700,000,000
Debt Instrument, Interest Rate, Stated Percentage		6.00%
Proceeds from Issuance of Debt			691,000,000.0
Revolving Loan Facility \| Crestwood Midstream Partners LP
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 1,250,000,000
Debt Instrument, Term			5 years
Subsequent Event
Debt Instrument [Line Items]
Extinguishment of Debt, Amount	$ 288,000,000
Loss on modification/extinguishment of debt	1,200,000
Interest Paid, Including Capitalized Interest, Operating and Investing Activities	$ 1,000,000.0

Commitments and Contingencies (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Damages	$ 55.0
Accrued amounts for outstanding legal matters	10.5	$ 10.4
Crestwood Midstream Partners LP
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Self-insurance reserves	6.4	$ 6.7
Self-insurance reserves expected to be paid	$ 4.1

Commitments and Contingencies (Environmental Compliance) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Site Contingency [Line Items]
Penalties	$ 0.1
Fort Berthold Indian Reservation
Site Contingency [Line Items]
Accrual of environmental loss contingencies	1.3	$ 1.3
Maximum \| Fort Berthold Indian Reservation
Site Contingency [Line Items]
Potential liability for environmental exposures	2.1
Minimum \| Fort Berthold Indian Reservation
Site Contingency [Line Items]
Potential liability for environmental exposures	$ 1.3

Commitments and Contingencies (Self Insurance) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Crestwood Equity Partners LP
Other Commitments [Line Items]
Self-insurance reserves	$ 7.3	$ 7.7
Self-insurance reserves expected to be paid	4.8
Crestwood Midstream Partners LP
Other Commitments [Line Items]
Self-insurance reserves	6.4	$ 6.7
Self-insurance reserves expected to be paid	$ 4.1

Leases (Details) - USD ($) $ in Millions	3 Months Ended
Leases (Details) - USD ($) $ in Millions	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets, net	$ 32.4		$ 36.8
Accrued expenses and other liabilities	131.9		122.0
Operating leases	25.9		28.5
Property, plant and equipment	3,767.6		3,759.6
Less: accumulated depreciation	885.0		842.5
Property, plant and equipment, net	2,882.6		2,917.1
Other long-term liabilities	255.2		253.3
Finance Lease, Liability	4.2		4.8
Operating lease expense	4.8	$ 7.5
Finance lease expense	0.9	$ 1.1
Operating Leases
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets, net	32.4		36.8
Accrued expenses and other liabilities	12.5		14.7
Operating leases	25.9		28.5
Total operating lease liabilities	38.4		43.2
Finance Leases
Lessee, Lease, Description [Line Items]
Accrued expenses and other liabilities	2.9		2.9
Property, plant and equipment	13.0		13.3
Less: accumulated depreciation	8.4		7.9
Property, plant and equipment, net	4.6		5.4
Other long-term liabilities	$ 1.3		$ 1.9

Partners' Capital (Schedule of Partners' Capital Account, Distributions) (Details) - USD ($) $ / shares in Units, $ in Millions	Feb. 12, 2021	Feb. 05, 2021	Feb. 14, 2020	Feb. 07, 2020
Distribution Made to Limited Partner [Line Items]
Distribution Made to Limited Partner, Date of Record		Feb. 05, 2021		Feb. 07, 2020
Distribution Made to Limited Partner, Distribution Date	Feb. 12, 2021		Feb. 14, 2020
Distribution Made to Member or Limited Partner, Distributions Paid, Per Unit	$ 0.625		$ 0.625
Distribution Made to Limited Partner, Cash Distributions Paid	$ 46.4		$ 45.3

Partners' Capital (Components of Net Income (Loss) Attributable to Non-Controlling Interests) (Details) $ in Millions	1 Months Ended
	Apr. 30, 2021 USD ($)
Crestwood Niobrara LLC \| Subsequent Event
Distribution Made to Limited Partner [Line Items]
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	$ (10.3)

Partners' Capital (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions								1 Months Ended		3 Months Ended
	May 14, 2021	May 07, 2021	Apr. 15, 2021	Feb. 12, 2021	Feb. 05, 2021	Feb. 14, 2020	Feb. 07, 2020	Mar. 31, 2021	Feb. 28, 2021	Mar. 31, 2021	Mar. 31, 2020
Distribution Made to Limited Partner [Line Items]
Distribution Made to Limited Partner, Distribution Date				Feb. 12, 2021		Feb. 14, 2020
Distribution Made to Limited Partner, Date of Record					Feb. 05, 2021		Feb. 07, 2020
Distributions to preferred unitholders										$ 15.0	$ 15.0
Incentive Distribution, Distribution										46.4	45.3
Distributions to non-controlling partner										9.3	9.2
Distribution Made to Limited Partner, Cash Distributions Paid				$ 46.4		$ 45.3
Transaction Costs								$ 8.0		8.0
Cash Paid to Repurchase Common Stock								268.0
General and Administrative Expense
Distribution Made to Limited Partner [Line Items]
Transaction Costs								$ 0.2		0.2
Common Units
Distribution Made to Limited Partner [Line Items]
Stock Repurchased and Retired During Period, Shares								11,500,000
Subordinated Units
Distribution Made to Limited Partner [Line Items]
Stock Repurchased and Retired During Period, Shares								400,000
Crestwood Midstream Partners LP
Distribution Made to Limited Partner [Line Items]
Incentive Distribution, Distribution										334.0	57.0
Distributions to non-controlling partner										9.3	9.2
Distribution Made to General Partner, Cash Distributions Paid										334.0	$ 57.0
Common unit
Distribution Made to Limited Partner [Line Items]
Transaction Costs								$ 7.8		7.8
Performance Shares
Distribution Made to Limited Partner [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period									50,000
Share-based Payment Arrangement, Noncash Expense										$ 0.1
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period										3 years
Subsequent Event
Distribution Made to Limited Partner [Line Items]
Distribution Made to Limited Partner, Distribution Date	May 14, 2021
Distribution Made to Limited Partner, Date of Record		May 07, 2021
Distributions to preferred unitholders			$ 15.0
Cash Distribution \| Subsequent Event
Distribution Made to Limited Partner [Line Items]
Distribution Made to Limited Partner, Distributions Declared, Per Unit			$ 0.625
Crestwood LTIP
Distribution Made to Limited Partner [Line Items]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount								$ 1.0		$ 1.0

Partners' Capital Rollforward of non-controlling interest (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Apr. 30, 2021	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Increase (Decrease) in Temporary Equity [Roll Forward]
Temporary Equity, Net Income		$ 10.1	$ 9.9
Interest of non-controlling partner in subsidiary		433.5	426.9	$ 432.7	$ 426.2
Subsequent Event \| Crestwood Niobrara LLC
Increase (Decrease) in Temporary Equity [Roll Forward]
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	$ (10.3)
Non-Controlling Partners
Increase (Decrease) in Temporary Equity [Roll Forward]
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders		$ (9.3)	$ (9.2)

- 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

Earnings Per Limited Partner Unit (Details) - shares shares in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Preferred Units
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	7.1	7.1
Performance Shares
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0.1	0.5
Subordinated Units
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0.4	0.4
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, Amount	4.2	25.6

Segments (Reconciliation of Net Income (Loss) to EBITDA) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($) segment	Mar. 31, 2020 USD ($)
Segment Reporting, Other Significant Reconciling Item [Line Items]
Number of Operating Segments \| segment	3
Net loss	$ (38.3)	$ (23.4)
Interest and debt expense, net	36.0	32.6
Benefit for income taxes	(0.1)	0.0
Depreciation, amortization and accretion	59.2	56.1
EBITDA	62.3	65.3
Loss on modification/extinguishment of debt	5.5	0.0
Crestwood Midstream Partners LP
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net loss	(40.4)	(25.6)
Interest and debt expense, net	36.0	32.6
Benefit for income taxes	(0.1)	0.0
Depreciation, amortization and accretion	62.8	59.6
EBITDA	63.8	66.6
Loss on modification/extinguishment of debt	$ 5.5	$ 0.0

- 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) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($) segment	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Net loss	$ (38.3)	$ (23.4)
Number of Operating Segments \| segment	3
Depreciation, amortization and accretion	$ 59.2	56.1
Segment Reporting Information, Additional Information [Abstract]
Revenues	1,032.7	727.9
Costs of product/services sold	813.8	534.4
Operations and maintenance	32.8	37.6
General and administrative	18.7	14.9
Gain (loss) on long-lived assets	(1.4)	(1.0)
Goodwill impairment	0.0	(80.3)
Earnings (loss) from unconsolidated affiliates, net	(103.7)	5.5
Other income, net	0.0	0.1
EBITDA	62.3	65.3
Assets	5,017.3		$ 5,243.7
Corporate, Non-Segment
Segment Reporting Information, Additional Information [Abstract]
Assets	31.6		29.5
Intersegment Eliminations
Segment Reporting Information, Additional Information [Abstract]
Revenues	(107.7)	(42.6)
Gathering and Processing Segment \| Operating Segments
Segment Reporting Information, Additional Information [Abstract]
Assets	3,421.9		3,464.6
Marketing Supply and Logistics
Segment Reporting Information, Additional Information [Abstract]
Revenues		509.5
Storage And Transportation Operations \| Operating Segments
Segment Reporting Information, Additional Information [Abstract]
Assets	832.5		944.6
Marketing Supply and Logistics \| Operating Segments
Segment Reporting Information, Additional Information [Abstract]
Assets	731.3		805.0
Crestwood Midstream Partners LP
Net loss	(40.4)	(25.6)
Depreciation, amortization and accretion	62.8	59.6
Segment Reporting Information, Additional Information [Abstract]
Revenues	1,032.7	727.9
Costs of product/services sold	813.8	534.4
Operations and maintenance	32.8	37.6
General and administrative	17.2	13.5
Gain (loss) on long-lived assets	(1.4)	(1.0)
Goodwill impairment	0.0	(80.3)
Earnings (loss) from unconsolidated affiliates, net	(103.7)	5.5
EBITDA	63.8	66.6
Assets	5,155.4		5,385.5
Crestwood Midstream Partners LP \| Corporate, Non-Segment
Segment Reporting Information, Additional Information [Abstract]
Revenues	0.0	0.0
Costs of product/services sold	0.0	0.0
Operations and maintenance	0.0	0.0
General and administrative	17.2	13.5
Gain (loss) on long-lived assets	0.0	0.0
Goodwill impairment		0.0
Earnings (loss) from unconsolidated affiliates, net	0.0	0.0
EBITDA	(17.2)	(13.5)
Assets	28.1		26.2
Crestwood Midstream Partners LP \| Corporate and Eliminations [Member]
Segment Reporting Information, Additional Information [Abstract]
Revenues	0.0	0.0
Crestwood Midstream Partners LP \| Gathering and Processing Segment \| Operating Segments
Segment Reporting Information, Additional Information [Abstract]
Revenues	154.4	214.9
Costs of product/services sold	116.5	108.3
Operations and maintenance	21.4	27.0
General and administrative	0.0	0.0
Gain (loss) on long-lived assets	(1.5)	(1.0)
Goodwill impairment		(80.3)
Earnings (loss) from unconsolidated affiliates, net	(0.8)	0.8
EBITDA	119.5	39.1
Assets	3,563.5		3,609.7
Crestwood Midstream Partners LP \| Gathering and Processing Segment \| Intersegment Eliminations
Segment Reporting Information, Additional Information [Abstract]
Revenues	105.3	40.0
Crestwood Midstream Partners LP \| Storage and Transportation \| Operating Segments
Segment Reporting Information, Additional Information [Abstract]
Revenues	2.0	3.5
Costs of product/services sold	0.4	0.2
Operations and maintenance	0.6	1.4
General and administrative	0.0	0.0
Gain (loss) on long-lived assets	0.0	0.0
Earnings (loss) from unconsolidated affiliates, net	(102.9)	4.7
EBITDA	(99.5)	9.2
Assets	832.5		944.6
Crestwood Midstream Partners LP \| Storage and Transportation \| Intersegment Eliminations
Segment Reporting Information, Additional Information [Abstract]
Revenues	2.4	2.6
Crestwood Midstream Partners LP \| Marketing Supply and Logistics \| Operating Segments
Segment Reporting Information, Additional Information [Abstract]
Revenues	876.3	509.5
Costs of product/services sold	696.9	425.9
Operations and maintenance	10.8	9.2
General and administrative	0.0	0.0
Gain (loss) on long-lived assets	0.1	0.0
Earnings (loss) from unconsolidated affiliates, net	0.0	0.0
EBITDA	61.0	31.8
Assets	731.3		805.0
Crestwood Midstream Partners LP \| Marketing Supply and Logistics \| Intersegment Eliminations
Segment Reporting Information, Additional Information [Abstract]
Revenues	(107.7)	(42.6)
Crestwood Midstream Partners LP \| Storage And Transportation Operations \| Operating Segments
Segment Reporting Information, Additional Information [Abstract]
Goodwill impairment		0.0
Crestwood Midstream Partners LP \| Marketing Supply and Logistics \| Operating Segments
Segment Reporting Information, Additional Information [Abstract]
Goodwill impairment		0.0
Crestwood Equity Partners LP
Segment Reporting Information, Additional Information [Abstract]
General and administrative	1.5	1.4
Other income, net		0.1
Assets	5,017.3		$ 5,243.7
Earnings (Losses) Before Interest, Taxes, Depreciation and Amortization	62.3	65.3
Crestwood Equity Partners LP \| Corporate, Non-Segment
Segment Reporting Information, Additional Information [Abstract]
General and administrative	1.5	1.4
Other income, net		0.1
Earnings (Losses) Before Interest, Taxes, Depreciation and Amortization	(18.7)	(14.8)
Crestwood Equity Partners LP \| Gathering and Processing Segment \| Operating Segments
Segment Reporting Information, Additional Information [Abstract]
General and administrative	0.0	0.0
Other income, net		0.0
Earnings (Losses) Before Interest, Taxes, Depreciation and Amortization	119.5	39.1
Crestwood Equity Partners LP \| Storage And Transportation Operations \| Operating Segments
Segment Reporting Information, Additional Information [Abstract]
General and administrative	0.0	0.0
Other income, net		0.0
Earnings (Losses) Before Interest, Taxes, Depreciation and Amortization	(99.5)	9.2
Crestwood Equity Partners LP \| Marketing Supply and Logistics \| Operating Segments
Segment Reporting Information, Additional Information [Abstract]
General and administrative	0.0	0.0
Other income, net		0.0
Earnings (Losses) Before Interest, Taxes, Depreciation and Amortization	$ 61.0	$ 31.8

Segments (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
Segments (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Interest, taxes, depreciation and amortization included in earnings from equity method investments	$ 129.4	$ 13.8

Revenues (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Revenue Recognition [Abstract]
ASC 606 accounts receivable	$ 223.0	$ 219.9

Revenues (Contract Assets and Liabilities) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Revenue Recognition [Abstract]
Contract Assets (Non-current)	$ 1.0	$ 1.0
Contract Liabilities (Current)	10.1	10.3
Contract liabilities	176.5	$ 172.2
Contract with Customer, Liability, Revenue Recognized	$ 3.1

Revenues (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Revenues	$ 1,032.7	$ 727.9
Gathering and Processing Operations
Disaggregation of Revenue [Line Items]
Revenue including intersegment eliminations	259.7	254.9
Storage and Transportation
Disaggregation of Revenue [Line Items]
Revenue including intersegment eliminations	4.4	6.1
Marketing Supply and Logistics
Disaggregation of Revenue [Line Items]
Revenues		509.5
Revenue including intersegment eliminations	876.3
Natural Gas Gathering
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	31.4	43.8
Natural Gas Gathering \| Gathering and Processing Operations
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	31.4	43.8
Natural Gas Gathering \| Storage and Transportation
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.0	0.0
Natural Gas Gathering \| Marketing Supply and Logistics
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.0	0.0
Crude Oil Gathering
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	20.7	26.5
Crude Oil Gathering \| Gathering and Processing Operations
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	20.7	26.5
Crude Oil Gathering \| Storage and Transportation
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.0	0.0
Crude Oil Gathering \| Marketing Supply and Logistics
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.0	0.0
Water Gathering
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	22.0	23.0
Water Gathering \| Gathering and Processing Operations
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	22.0	23.0
Water Gathering \| Storage and Transportation
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.0	0.0
Water Gathering \| Marketing Supply and Logistics
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.0	0.0
Natural Gas Processing
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	7.0	10.2
Natural Gas Processing \| Gathering and Processing Operations
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	7.0	10.2
Natural Gas Processing \| Storage and Transportation
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.0	0.0
Natural Gas Processing \| Marketing Supply and Logistics
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.0	0.0
Natural Gas Compression
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	4.7	6.3
Natural Gas Compression \| Gathering and Processing Operations
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	4.7	6.3
Natural Gas Compression \| Storage and Transportation
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.0	0.0
Natural Gas Compression \| Marketing Supply and Logistics
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.0	0.0
Crude Oil Storage
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.2	0.7
Crude Oil Storage \| Gathering and Processing Operations
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.1	0.5
Crude Oil Storage \| Storage and Transportation
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.6	0.6
Crude Oil Storage \| Marketing Supply and Logistics
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.0	0.0
NGL Storage
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	3.7	1.6
NGL Storage \| Gathering and Processing Operations
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.0	0.0
NGL Storage \| Storage and Transportation
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.0	0.0
NGL Storage \| Marketing Supply and Logistics
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	3.7	1.6
Crude Oil Pipeline
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.8	1.1
Crude Oil Pipeline \| Gathering and Processing Operations
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.0	0.0
Crude Oil Pipeline \| Storage and Transportation
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1.3	1.6
Crude Oil Pipeline \| Marketing Supply and Logistics
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.0	0.0
Crude Oil Transportation
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.7	3.6
Crude Oil Transportation \| Gathering and Processing Operations
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.7	2.0
Crude Oil Transportation \| Storage and Transportation
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.0	0.0
Crude Oil Transportation \| Marketing Supply and Logistics
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.0	1.6
NGL Transportation
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	4.2	1.7
NGL Transportation \| Gathering and Processing Operations
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.0	0.0
NGL Transportation \| Storage and Transportation
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.0	0.0
NGL Transportation \| Marketing Supply and Logistics
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	4.2	1.7
Crude Oil Rail Loading
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1.0	2.0
Crude Oil Rail Loading \| Gathering and Processing Operations
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.0	0.0
Crude Oil Rail Loading \| Storage and Transportation
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2.3	3.4
Crude Oil Rail Loading \| Marketing Supply and Logistics
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.0	0.0
Natural Gas Product Sales
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	96.2	18.6
Natural Gas Product Sales \| Gathering and Processing Operations
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	42.8	12.0
Natural Gas Product Sales \| Storage and Transportation
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.0	0.0
Natural Gas Product Sales \| Marketing Supply and Logistics
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	95.6	18.3
Crude Oil Product Sales
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	318.5	355.0
Crude Oil Product Sales \| Gathering and Processing Operations
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	90.0	121.1
Crude Oil Product Sales \| Storage and Transportation
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.0	0.0
Crude Oil Product Sales \| Marketing Supply and Logistics
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	251.2	250.2
NGL Product Sales
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	406.0	157.9
NGL Product Sales \| Gathering and Processing Operations
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	40.3	9.5
NGL Product Sales \| Storage and Transportation
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.0	0.0
NGL Product Sales \| Marketing Supply and Logistics
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	406.0	160.3
Other revenue
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.2	0.6
Other revenue \| Gathering and Processing Operations
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.0	0.0
Other revenue \| Storage and Transportation
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.2	0.5
Other revenue \| Marketing Supply and Logistics
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.2	0.5
Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Revenues	(107.7)	(42.6)
Intersegment Eliminations \| Natural Gas Gathering
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.0	0.0
Intersegment Eliminations \| Crude Oil Gathering
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.0	0.0
Intersegment Eliminations \| Water Gathering
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.0	0.0
Intersegment Eliminations \| Natural Gas Processing
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.0	0.0
Intersegment Eliminations \| Natural Gas Compression
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.0	0.0
Intersegment Eliminations \| Crude Oil Storage
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	(0.5)	(0.4)
Intersegment Eliminations \| NGL Storage
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.0	0.0
Intersegment Eliminations \| Crude Oil Pipeline
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	(0.5)	(0.5)
Intersegment Eliminations \| Crude Oil Transportation
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.0	0.0
Intersegment Eliminations \| NGL Transportation
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.0	0.0
Intersegment Eliminations \| Crude Oil Rail Loading
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	(1.3)	(1.4)
Intersegment Eliminations \| Natural Gas Product Sales
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	(42.2)	(11.7)
Intersegment Eliminations \| Crude Oil Product Sales
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	(22.7)	(16.3)
Intersegment Eliminations \| NGL Product Sales
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	(40.3)	(11.9)
Intersegment Eliminations \| Other revenue
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	(0.2)	(0.4)
Revenue from Contract with Customer
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	917.3	652.6
Revenue from Contract with Customer \| Gathering and Processing Operations
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	259.7	254.9
Revenue from Contract with Customer \| Storage and Transportation
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	4.4	6.1
Revenue from Contract with Customer \| Marketing Supply and Logistics
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	760.9	434.2
Revenue from Contract with Customer \| Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	(107.7)	(42.6)
Product and Service, Other
Disaggregation of Revenue [Line Items]
Non-Topic 606 revenues	115.4	75.3
Product and Service, Other \| Gathering and Processing Operations
Disaggregation of Revenue [Line Items]
Non-Topic 606 revenues	0.0	0.0
Product and Service, Other \| Storage and Transportation
Disaggregation of Revenue [Line Items]
Non-Topic 606 revenues	0.0	0.0
Product and Service, Other \| Marketing Supply and Logistics
Disaggregation of Revenue [Line Items]
Non-Topic 606 revenues	115.4	75.3
Product and Service, Other \| Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Non-Topic 606 revenues	$ 0.0	$ 0.0

Revenues (Remaining Performance Obligations) (Details) $ in Millions	Mar. 31, 2021 USD ($)
Revenue Recognition [Abstract]
Revenue, Remaining Performance Obligation, Amount	$ 230.5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01
Revenue Recognition [Abstract]
Revenue, Remaining Performance Obligation, Amount	$ 69.8
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue Recognition [Abstract]
Revenue, Remaining Performance Obligation, Amount	$ 77.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue Recognition [Abstract]
Revenue, Remaining Performance Obligation, Amount	$ 52.3
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue Recognition [Abstract]
Revenue, Remaining Performance Obligation, Amount	$ 31.4
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, 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 Obligation, Expected Timing of Satisfaction, Period	16 years

Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Related Party Transaction [Line Items]
Purchases of property, plant and equipment	$ 9.3	$ 86.8
Costs of product/services sold at CEQP and CMLP(2)	41.1	3.2
Operations and maintenance expenses charged by CEQP and CMLP	5.7	6.2
Related Party Transaction, Due from (to) Related Party [Abstract]
Noncash Distribution to Parent [Line Items]	2.6
Tres Palacios Holdings LLC
Related Party Transaction [Line Items]
Costs of product/services sold at CEQP and CMLP(2)	10.8
Applied Consultants, Inc.
Related Party Transaction [Line Items]
Purchases of property, plant and equipment	0.3	2.4
Crestwood Permian Basin Holdings LLC
Related Party Transaction [Line Items]
Costs of product/services sold at CEQP and CMLP(2)	30.3	3.2
Affiliated Entity
Related Party Transaction [Line Items]
Revenues at CEQP and CMLP	4.9	7.5
Costs of product/services sold at CEQP and CMLP(2)	41.1	3.2
General and administrative expenses charged by CEQP to CMLP, net	5.9	7.1
Related Party Transaction, Due from (to) Related Party [Abstract]
Related party receivables	8.1		$ 2.5
Related party payables	15.4		7.5
Crestwood Equity Partners LP
Related Party Transaction [Line Items]
General and administrative expenses at CEQP charged to (from) Crestwood Holdings, net	4.8	12.8
Crestwood Equity Partners LP \| Affiliated Entity
Related Party Transaction [Line Items]
General and administrative expenses charged by CEQP to CMLP, net	0.2	0.2
Crestwood Midstream Partners LP
Related Party Transaction [Line Items]
Purchases of property, plant and equipment	9.3	86.8
Revenues at CEQP and CMLP	0.0	0.2
Costs of product/services sold at CEQP and CMLP(2)	41.1	3.2
Crestwood Midstream Partners LP \| Affiliated Entity
Related Party Transaction [Line Items]
General and administrative expenses charged by CEQP to CMLP, net	1.0	1.1
Related Party Transaction, Due from (to) Related Party [Abstract]
Related party payables	15.4		$ 5.0
Crestwood LTIP \| Crestwood Midstream Partners LP
Related Party Transaction [Line Items]
Share-based Payment Arrangement, Expense	6.9	8.2
Crestwood LTIP \| Crestwood Holdings
Related Party Transaction [Line Items]
Share-based Payment Arrangement, Expense	4.6	12.6
Stagecoach Gas Services LLC
Related Party Transaction [Line Items]
Operations and maintenance expenses charged by CEQP and CMLP	1.7	1.7
Tres Palacios Holdings LLC
Related Party Transaction [Line Items]
Operations and maintenance expenses charged by CEQP and CMLP	1.2	1.1
Crestwood Permian Basin Holdings LLC
Related Party Transaction [Line Items]
Operations and maintenance expenses charged by CEQP and CMLP	$ 2.8	$ 3.4