Crestwood Equity Partners (CEQP+) 10-Q 29 Jul 21 2021 Q2 Quarterly report Financial data

Cover Page

Cover Page - shares	6 Months Ended
	Jun. 30, 2021	Jul. 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	Q2
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		62,901,947
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	Jun. 30, 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	Q2
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	Jun. 30, 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

Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Assets
Cash	$ 16.6	$ 14
Accounts receivable, less allowance for doubtful accounts of $2.0 million and $0.9 million at June 30, 2021 and December 31, 2020	329.1	262.2
Inventory	148.1	89.1
Assets from price risk management activities	27.6	27.2
Prepaid expenses and other current assets	8.4	13.4
Total current assets	529.8	405.9
Property, plant and equipment	3,805.2	3,759.6
Less: accumulated depreciation	927.1	842.5
Property, plant and equipment, net	2,878.1	2,917.1
Intangible assets	1,126.1	1,126.1
Less: accumulated amortization	362.5	331.8
Intangible assets, net	763.6	794.3
Goodwill	138.6	138.6
Operating lease right-of-use assets, net	29.6	36.8
Investments in unconsolidated affiliates	782.9	943.7
Other non-current assets	7.6	7.3
Total assets	5,130.2	5,243.7
Current liabilities:
Accounts payable	302.4	160.3
Accrued expenses and other liabilities	154.8	122
Liabilities from price risk management activities	150.1	76.3
Contingent consideration, current portion	19	19
Current portion of long-term debt	0.2	0.2
Total current liabilities	626.5	377.8
Long-term debt, less current portion	2,621.6	2,483.8
Contingent consideration	19	38
Other long-term liabilities	254.9	253.3
Deferred income taxes	2.6	2.7
Total liabilities	3,524.6	3,155.6
Commitments and contingencies (Note 9)
Interest of non-controlling partner in subsidiary	433.5	432.7
Partners’ capital:
Crestwood Equity Partners LP partners’ capital (62,805,156 common units issued and outstanding at June 30, 2021 and 73,970,208 common and subordinated units issued and outstanding at December 31, 2020)	560.1	1,043.4
Preferred units (71,257,445 units issued and outstanding at both June 30, 2021 and December 31, 2020)	612	612
Total partners’ capital	1,172.1	1,655.4
Total liabilities and capital	$ 5,130.2	$ 5,243.7
Limited Partners' Capital Account, Units Issued	62,805,156	73,970,208
Limited Partners' Capital Account, Units Outstanding	62,805,156	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 $2.0 million and $0.9 million at June 30, 2021 and December 31, 2020	329	262.2
Inventory	148.1	89.1
Assets from price risk management activities	27.6	27.2
Prepaid expenses and other current assets	8.4	13.4
Total current assets	529	405.6
Property, plant and equipment	4,135.3	4,089.6
Less: accumulated depreciation	1,120	1,028.3
Property, plant and equipment, net	3,015.3	3,061.3
Intangible assets	1,126.1	1,126.1
Less: accumulated amortization	362.5	331.8
Intangible assets, net	763.6	794.3
Goodwill	138.6	138.6
Operating lease right-of-use assets, net	29.6	36.8
Investments in unconsolidated affiliates	782.9	943.7
Other non-current assets	5.4	5.2
Total assets	5,264.4	5,385.5
Current liabilities:
Accounts payable	302.4	157.8
Accrued expenses and other liabilities	153.3	120.1
Liabilities from price risk management activities	150.1	76.3
Contingent consideration, current portion	19	19
Current portion of long-term debt	0.2	0.2
Total current liabilities	625	373.4
Long-term debt, less current portion	2,621.6	2,483.8
Contingent consideration	19	38
Other long-term liabilities	252.6	251.8
Deferred income taxes	0.7	0.7
Total liabilities	3,518.9	3,147.7
Commitments and contingencies (Note 9)
Interest of non-controlling partner in subsidiary	433.5	432.7
Partners’ capital:
Partners' capital	1,312	1,805.1
Total liabilities and capital	$ 5,264.4	$ 5,385.5

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Allowance for doubtful accounts	$ 2	$ 0.9
Limited Partners' Capital Account, Units Issued	62,805,156	73,970,208
Limited Partners' Capital Account, Units Outstanding	62,805,156	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	$ 2	$ 0.9

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues:
Revenues	$ 929.6	$ 352.7	$ 1,962.3	$ 1,080.6
Costs of product/services sold (exclusive of items shown separately below):
Product costs - related party (Note 15)	25.4	3.6	66.5	6.8
Total costs of product/services sold	797.2	225.7	1,611	760.1
Operating expenses and other:
Operations and maintenance	25.8	31.6	58.6	69.2
General and administrative	22.8	29.5	41.5	44.4
Depreciation, amortization and accretion	58.8	61	118	117.1
(Gain) loss on long-lived assets, net	(0.3)	3.8	1.1	4.8
Goodwill impairment	0	0	0	80.3
Total expenses	107.1	125.9	219.2	315.8
Operating income (loss)	25.3	1.1	132.1	4.7
Earnings (loss) from unconsolidated affiliates, net	(27.1)	8.4	(130.8)	13.9
Interest and debt expense, net	(35.1)	(34)	(71.1)	(66.6)
Gain (Loss) on Extinguishment of Debt	(1.2)	0	(6.7)	0
Other income, net	0.1	0.1	0.1	0.2
Loss before income taxes	(38)	(24.4)	(76.4)	(47.8)
(Provision) benefit for income taxes	(0.1)	0.1	0	0.1
Net loss	(38.1)	(24.3)	(76.4)	(47.7)
Net income attributable to non-controlling partner	10.3	10.2	20.4	20.1
Net income (loss) attributable to parent	(48.4)	(34.5)	(96.8)	(67.8)
Net income attributable to preferred unit holders	15	15	30	30
Net loss attributable to partners	$ (63.4)	$ (49.5)	$ (126.8)	$ (97.8)
Net loss per limited partner unit: (Note 12)
Basic (in dollars per share)	$ (1)	$ (0.68)	$ (1.85)	$ (1.34)
Diluted (in dollars per share)	$ (1)	$ (0.68)	$ (1.85)	$ (1.34)
Weighted-average limited partners’ units outstanding:
Basic (units)	63.5	73.2	68.4	73
Diluted (units)	63.5	73.2	68.4	73
Crestwood Midstream Partners LP
Revenues:
Revenues	$ 929.6	$ 352.7	$ 1,962.3	$ 1,080.6
Related party (Note 15)	0.4	0.1	0.4	0.3
Costs of product/services sold (exclusive of items shown separately below):
Product costs - related party (Note 15)	25.4	3.6	66.5	6.8
Total costs of product/services sold	797.2	225.7	1,611	760.1
Operating expenses and other:
Operations and maintenance	25.8	31.6	58.6	69.2
General and administrative	19.7	28.4	36.9	41.9
Depreciation, amortization and accretion	62.2	64.6	125	124.2
(Gain) loss on long-lived assets, net	(0.3)	3.8	1.1	4.8
Goodwill impairment	0	0	0	80.3
Total expenses	107.4	128.4	221.6	320.4
Operating income (loss)	25	(1.4)	129.7	0.1
Earnings (loss) from unconsolidated affiliates, net	(27.1)	8.4	(130.8)	13.9
Interest and debt expense, net	(35.1)	(34)	(71.1)	(66.6)
Gain (Loss) on Extinguishment of Debt	(1.2)	0	(6.7)	0
Loss before income taxes	(38.4)	(27)	(78.9)	(52.6)
(Provision) benefit for income taxes	(0.1)	0.2	0	0.2
Net loss	(38.5)	(26.8)	(78.9)	(52.4)
Net income attributable to non-controlling partner	10.3	10.2	20.4	20.1
Net income (loss) attributable to parent	(48.8)	(37)	(99.3)	(72.5)
Product
Revenues:
Revenues	833.5	258.4	1,769	864.9
Related party (Note 15)	12.8	7.4	17.7	14.7
Costs of product/services sold (exclusive of items shown separately below):
Costs of product/services sold	768	217.4	1,535.6	742
Product | Crestwood Midstream Partners LP
Revenues:
Revenues	833.5	258.4	1,769	864.9
Related party (Note 15)	12.8	7.4	17.7	14.7
Costs of product/services sold (exclusive of items shown separately below):
Costs of product/services sold	768	217.4	1,535.6	742
Service
Revenues:
Revenues	96.1	94.3	193.3	215.7
Related party (Note 15)	0.4	0.1	0.4	0.3
Costs of product/services sold (exclusive of items shown separately below):
Costs of product/services sold	3.8	4.7	8.9	11.3
Service | Crestwood Midstream Partners LP
Revenues:
Revenues	96.1	94.3	193.3	215.7
Costs of product/services sold (exclusive of items shown separately below):
Costs of product/services sold	3.8	4.7	8.9	11.3
Gathering and Processing Segment | Product
Revenues:
Revenues	87.3	30.5	155.2	133.2
Gathering and Processing Segment | Product | Crestwood Midstream Partners LP
Revenues:
Revenues	87.3	30.5	155.2	133.2
Gathering and Processing Segment | Service
Revenues:
Revenues	85.8	84	172.3	196.2
Gathering and Processing Segment | Service | Crestwood Midstream Partners LP
Revenues:
Revenues	85.8	84	172.3	196.2
Marketing Supply and Logistics
Revenues:
Revenues				744.6
Marketing Supply and Logistics | Product
Revenues:
Revenues	733.4	220.5	1,596.1	717
Marketing Supply and Logistics | Product | Crestwood Midstream Partners LP
Revenues:
Revenues	733.4	220.5	1,596.1	717
Marketing Supply and Logistics | Service
Revenues:
Revenues	7.9	7.1	16.6	12.6
Marketing Supply and Logistics | Service | Crestwood Midstream Partners LP
Revenues:
Revenues	7.9	7.1	16.6	12.6
Storage and Transportation | Service
Revenues:
Revenues	2	3.1	4	6.6
Storage and Transportation | Service | Crestwood Midstream Partners LP
Revenues:
Revenues	$ 2	$ 3.1	$ 4	$ 6.6

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ (38.1)	$ (24.3)	$ (76.4)	$ (47.7)
Change in fair value of Suburban Propane Partners, L.P. units	0	0	0	(1.1)
Comprehensive loss	(38.1)	(24.3)	(76.4)	(48.8)
Comprehensive income attributable to non-controlling partner	10.3	10.2	20.4	20.1
Comprehensive loss attributable to Crestwood Equity Partners LP	$ (48.4)	$ (34.5)	$ (96.8)	$ (68.9)

Consolidated Statement of Partn

Consolidated Statement of Partners' Capital - USD ($) $ in Millions	Total	Preferred Units	Common unit	Partners' Capital	Crestwood Midstream Partners LP	Crestwood Midstream Partners LPPartners' Capital	Preferred Units	Common Units	Subordinated Units
Preferred units, beginning balance (in units) at Dec. 31, 2019							71,300,000
Partner units, beginning balance (in units) at Dec. 31, 2019								71,900,000	400,000
Beginning balance at Dec. 31, 2019		$ 612	$ 1,320.8	$ 1,932.8		$ 2,099.3
Increase (Decrease) in Partners' Capital [Roll Forward]
Distributions to partners		(15)	(45.3)	(60.3)		(57)
Unit-based compensation charges (in shares)								1,700,000
Unit-based compensation charges			0.2	0.2		(4.4)
Taxes paid for unit-based compensation vesting (in shares)								(500,000)
Taxes paid for unit-based compensation vesting			(15.1)	(15.1)		(15.1)
Change in fair value of Suburban Propane Partners, L.P. units			(1.1)	(1.1)
Other			3.5	3.5		(1.1)
Net income (loss) attributable to parent		15	(48.3)	(33.3)		(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	1,214.7	1,826.7		1,986.2
Preferred units, beginning balance (in units) at Dec. 31, 2019							71,300,000
Partner units, beginning balance (in units) at Dec. 31, 2019								71,900,000	400,000
Beginning balance at Dec. 31, 2019		612	1,320.8	1,932.8		2,099.3
Increase (Decrease) in Partners' Capital [Roll Forward]
Change in fair value of Suburban Propane Partners, L.P. units	$ (1.1)
Net income (loss) attributable to parent	(67.8)				$ (72.5)
Preferred units, ending balance (in units) at Jun. 30, 2020							71,300,000
Partner units, ending balance (in units) at Jun. 30, 2020								73,200,000	400,000
Ending Balance at Jun. 30, 2020		612	1,132.6	1,744.6		1,900.5
Increase (Decrease) in Partners' Capital [Roll Forward]
Other (in shares)								200,000
Preferred units, beginning balance (in units) at Mar. 31, 2020							71,300,000
Partner units, beginning balance (in units) at Mar. 31, 2020								73,300,000	400,000
Beginning balance at Mar. 31, 2020		612	1,214.7	1,826.7		1,986.2
Increase (Decrease) in Partners' Capital [Roll Forward]
Distributions to partners		(15)	(45.7)	(60.7)		(62)
Unit-based compensation charges			13.6	13.6		13.6
Taxes paid for unit-based compensation vesting (in shares)								(100,000)
Taxes paid for unit-based compensation vesting			(0.4)	(0.4)		(0.4)
Change in fair value of Suburban Propane Partners, L.P. units	0
Other			(0.1)	(0.1)		0.1
Net income (loss) attributable to parent	$ (34.5)	15	(49.5)	(34.5)	(37)	(37)
Preferred units, ending balance (in units) at Jun. 30, 2020							71,300,000
Partner units, ending balance (in units) at Jun. 30, 2020								73,200,000	400,000
Ending Balance at Jun. 30, 2020		612	1,132.6	1,744.6		1,900.5
Preferred units, beginning balance (in units) at Dec. 31, 2020	71,257,445						71,300,000
Partner units, beginning balance (in units) at Dec. 31, 2020								73,600,000	400,000
Beginning balance at Dec. 31, 2020		612	1,043.4	1,655.4	1,805.1	1,805.1
Increase (Decrease) in Partners' Capital [Roll Forward]
Stock Repurchased and Retired During Period, Value			(273.2)	(273.2)
Treasury Stock, Shares, Retired								(11,500,000)	(400,000)
Distributions to partners		(15)	(46.4)	(61.4)		(334)
Unit-based compensation charges (in shares)								1,100,000
Unit-based compensation charges			3.7	3.7		2.3
Taxes paid for unit-based compensation vesting (in shares)								(400,000)
Taxes paid for unit-based compensation vesting			(8.1)	(8.1)		(8.1)
Other			(0.4)	(0.4)		(0.1)
Net income (loss) attributable to parent		15	(63.4)	(48.4)		(50.5)
Preferred units, ending balance (in units) at Mar. 31, 2021							71,300,000
Partner units, ending balance (in units) at Mar. 31, 2021								62,800,000	0
Ending Balance at Mar. 31, 2021		612	655.6	1,267.6		1,414.7
Preferred units, beginning balance (in units) at Dec. 31, 2020	71,257,445						71,300,000
Partner units, beginning balance (in units) at Dec. 31, 2020								73,600,000	400,000
Beginning balance at Dec. 31, 2020		612	1,043.4	1,655.4	1,805.1	1,805.1
Increase (Decrease) in Partners' Capital [Roll Forward]
Change in fair value of Suburban Propane Partners, L.P. units	$ 0
Net income (loss) attributable to parent	$ (96.8)				(99.3)
Preferred units, ending balance (in units) at Jun. 30, 2021	71,257,445						71,300,000
Partner units, ending balance (in units) at Jun. 30, 2021								62,800,000	0
Ending Balance at Jun. 30, 2021		612	560.1	1,172.1	1,312	1,312
Preferred units, beginning balance (in units) at Mar. 31, 2021							71,300,000
Partner units, beginning balance (in units) at Mar. 31, 2021								62,800,000	0
Beginning balance at Mar. 31, 2021		612	655.6	1,267.6		1,414.7
Increase (Decrease) in Partners' Capital [Roll Forward]
Distributions to partners		(15)	(39.3)	(54.3)		(61.4)
Unit-based compensation charges (in shares)								0
Unit-based compensation charges			7.6	7.6		7.6
Taxes paid for unit-based compensation vesting (in shares)								0
Taxes paid for unit-based compensation vesting			(0.1)	(0.1)		(0.1)
Change in fair value of Suburban Propane Partners, L.P. units	$ 0
Other			(0.3)	(0.3)
Net income (loss) attributable to parent	$ (48.4)	15	(63.4)	(48.4)	(48.8)	(48.8)
Preferred units, ending balance (in units) at Jun. 30, 2021	71,257,445						71,300,000
Partner units, ending balance (in units) at Jun. 30, 2021								62,800,000	0
Ending Balance at Jun. 30, 2021		$ 612	$ 560.1	$ 1,172.1	$ 1,312	$ 1,312

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Operating activities
Net loss	$ (76.4)	$ (47.7)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, amortization and accretion	118	117.1
Amortization of debt-related deferred costs	3.4	3.2
Unit-based compensation charges	9.9	9.2
Loss on long-lived assets, net	1.1	4.8
Goodwill impairment	0	80.3
Loss on modification/extinguishment of debt	6.7	0
(Earnings) loss from unconsolidated affiliates, net, adjusted for cash distributions received	141.1	5.4
Deferred income taxes	(0.1)	(0.3)
Other Operating Activities, Cash Flow Statement	0.1	0
Changes in operating assets and liabilities	89.7	11.4
Net cash provided by operating activities	293.5	183.4
Investing activities
Acquisitions, net of cash acquired (Note 3)	0	(162.3)
Purchases of property, plant and equipment	(21.3)	(143.2)
Investments in unconsolidated affiliates	(10.2)	(6)
Capital distributions from unconsolidated affiliates	32.9	18.9
Other	0.5	(0.3)
Net cash provided by (used in) investing activities	1.9	(292.9)
Financing activities
Proceeds from the issuance of long-term debt	2,005.6	742.5
Payments on long-term debt	(1,866.8)	(498.2)
Payments on finance leases	(1.4)	(1.6)
Payments for deferred financing costs	(11.1)	0
Net proceeds from issuance of non-controlling interest	0	2.8
Payments for Crestwood Holdings Transactions	(275.6)	0
Distributions to partners	(85.7)	(91)
Distributions to non-controlling partner	(19.6)	(18.5)
Distributions to preferred unitholders	(30)	(30)
Taxes paid for unit-based compensation vesting	(8.2)	(15.5)
Net cash provided by (used in) financing activities	(292.8)	90.5
Net change in cash	2.6	(19)
Cash at beginning of period	14	25.7
Cash at end of period	16.6	6.7
Supplemental schedule of noncash investing activities
Net change to property, plant and equipment through accounts payable and accrued expenses	(29.2)	35.9
Crestwood Midstream Partners LP
Operating activities
Net loss	(78.9)	(52.4)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, amortization and accretion	125	124.2
Amortization of debt-related deferred costs	3.4	3.2
Unit-based compensation charges	9.9	9.2
Loss on long-lived assets, net	1.1	4.8
Goodwill impairment	0	80.3
Loss on modification/extinguishment of debt	6.7	0
(Earnings) loss from unconsolidated affiliates, net, adjusted for cash distributions received	141.1	5.4
Deferred income taxes	0	(0.1)
Other Operating Activities, Cash Flow Statement	0.1	0
Changes in operating assets and liabilities	88.8	6.5
Net cash provided by operating activities	297.2	181.1
Investing activities
Acquisitions, net of cash acquired (Note 3)	0	(162.3)
Purchases of property, plant and equipment	(21.3)	(143.2)
Investments in unconsolidated affiliates	(10.2)	(6)
Capital distributions from unconsolidated affiliates	32.9	18.9
Other	0.5	(0.3)
Net cash provided by (used in) investing activities	1.9	(292.9)
Financing activities
Proceeds from the issuance of long-term debt	2,005.6	742.5
Payments on long-term debt	(1,866.8)	(498.2)
Payments on finance leases	(1.4)	(1.6)
Payments for deferred financing costs	(11.1)	0
Net proceeds from issuance of non-controlling interest	0	2.8
Distributions to partners	(395.4)	(119)
Distributions to non-controlling partner	(19.6)	(18.5)
Taxes paid for unit-based compensation vesting	(8.2)	(15.5)
Net cash provided by (used in) financing activities	(296.9)	92.5
Net change in cash	2.2	(19.3)
Cash at beginning of period	13.7	25.4
Cash at end of period	15.9	6.1
Supplemental schedule of noncash investing activities
Net change to property, plant and equipment through accounts payable and accrued expenses	$ (29.2)	35.9
Non-Controlling Partners
Financing activities
Net proceeds from issuance of non-controlling interest		$ 2.8

Organization and Business Descr

Organization and Business Description	6 Months Ended
	Jun. 30, 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 June 30, 2021, and for the three and six months ended June 30, 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 either 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, 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 June 30, 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 natural gas liquids (NGLs), 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 NGLs, crude oil and natural gas marketing, storage, terminal and transportation services to producers, refiners, marketers and other customers.

Basis of Presentation and Summa

Basis of Presentation and Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 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. Certain amounts and footnote disclosures in the prior periods have been reclassified to conform to the current year presentation, none of which impacted our previously reported net income, earnings per unit or partners’ capital. In management’s opinion, all necessary adjustments to fairly present our results of operations, financial position and cash flows for the periods presented have been made and all such adjustments are of a normal and recurring nature. 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 six months ended June 30, 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.

Acquisitions

Acquisitions	6 Months Ended
	Jun. 30, 2021
Business Combinations [Abstract]
Acquisitions and Divestitures	AcquisitionIn April 2020, we acquired several NGL storage and rail-to-truck terminals from Plains All American Pipeline, L.P. for approximately $162 million. The acquired assets include 7 MMBbls of NGL storage and seven terminals. These assets are included in our marketing, supply and logistics segment. The transaction costs related to this acquisition were not material during the three and six months ended June 30, 2020.

Certain Balance Sheet Informati

Certain Balance Sheet Information	6 Months Ended
	Jun. 30, 2021
Balance Sheet Related Disclosures [Abstract]
Certain Balance Sheet Information	Certain Balance Sheet Information Accrued Expenses and Other Liabilities Accrued expenses and other liabilities consisted of the following ( in millions ): CEQP CMLP June 30, December 31, June 30, December 31, 2021 2020 2021 2020 Accrued expenses $ 50.9 $ 48.3 $ 49.4 $ 46.4 Accrued property taxes 6.3 8.4 6.3 8.4 Income tax payable 0.2 0.2 0.2 0.2 Interest payable 32.4 24.9 32.4 24.9 Accrued additions to property, plant and equipment 39.8 12.3 39.8 12.3 Operating leases 12.0 14.7 12.0 14.7 Finance leases 2.7 2.9 2.7 2.9 Deferred revenue 10.5 10.3 10.5 10.3 Total accrued expenses and other liabilities $ 154.8 $ 122.0 $ 153.3 $ 120.1 Other Long-Term Liabilities Other long-term liabilities consisted of the following ( in millions ): CEQP CMLP June 30, December 31, June 30, December 31, 2021 2020 2021 2020 Contract liabilities $ 179.2 $ 172.2 $ 179.2 $ 172.2 Operating leases 23.3 28.5 23.3 28.5 Asset retirement obligations 35.1 34.1 35.1 34.1 Other 17.3 18.5 15.0 17.0 Total other long-term liabilities $ 254.9 $ 253.3 $ 252.6 $ 251.8

Investments in Unconsolidated A

Investments in Unconsolidated Affiliates	6 Months Ended
	Jun. 30, 2021
Equity Method Investments and Joint Ventures [Abstract]
Investments in Unconsolidated Affiliates	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 (loss) from our unconsolidated affiliates are as follows ( in millions ): Investment Earnings (Loss) from Earnings (Loss) from Three Months Ended Six Months Ended June 30, December 31, June 30, June 30, 2021 2020 2021 2020 2021 2020 Stagecoach Gas Services LLC (1) $ 628.2 $ 792.5 $ (28.0) $ 9.2 $ (140.3) $ 18.4 Tres Palacios Holdings LLC (2) 41.0 35.5 (0.1) 0.1 9.2 0.1 Powder River Basin Industrial Complex, LLC (3) 3.6 3.6 — 0.1 0.1 (4.4) Crestwood Permian Basin Holdings LLC (4) 110.1 112.1 1.0 (1.0) 0.2 (0.2) Total $ 782.9 $ 943.7 $ (27.1) $ 8.4 $ (130.8) $ 13.9 (1) As of June 30, 2021, our equity in the underlying net assets of Stagecoach Gas Services LLC (Stagecoach Gas) approximates the carrying value of our investment. During the six months ended June 30, 2021, we and the other 50% owner of Stagecoach Gas, Con Edison Gas Pipeline and Storage Northeast, LLC (CEGP) entered into an agreement to sell Stagecoach Gas to a subsidiary of Kinder Morgan, Inc. (Kinder Morgan) in a series of transactions. Based on these anticipated transactions, we recorded our share of a loss on long-lived assets (including goodwill) recorded by our Stagecoach Gas equity investment associated with the anticipated sale. 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 $35.5 million and $155.4 million reduction in our earnings from unconsolidated affiliates during the three and six months ended June 30, 2021. In addition, our earnings from unconsolidated affiliates during the three and six months ended June 30, 2021 were also reduced by our proportionate share of transaction costs of approximately $3.0 million related to the anticipated sale, which were paid by us in July 2021 on behalf of Stagecoach Gas. Our Stagecoach Gas investment is included in our storage and transportation segment. (2) As of June 30, 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 $22.1 million. During both the three and six months ended June 30, 2021 and 2020, we recorded amortization of approximately $0.3 million and $0.6 million, respectively, 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 June 30, 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 six months ended June 30, 2020. Our PRBIC investment is included in our storage and transportation segment. (4) As of June 30, 2021, our equity in the underlying net assets of Crestwood Permian exceeded our investment balance by $7.7 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 ): Six Months Ended June 30, 2021 2020 Operating Revenues Operating Expenses Net Income (Loss) Operating Revenues Operating Expenses Net Income (Loss) Stagecoach Gas $ 77.5 $ 454.9 $ (377.4) $ 75.6 $ 38.9 $ 36.8 Other (1) 135.1 118.0 17.6 53.5 76.1 (21.6) Total $ 212.6 $ 572.9 $ (359.8) $ 129.1 $ 115.0 $ 15.2 (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 Six Months Ended Six Months Ended June 30, June 30, 2021 2020 2021 2020 Stagecoach Gas $ 27.0 $ 30.0 $ — $ — Tres Holdings 10.6 1.4 6.9 6.0 PRBIC 0.1 0.1 — — Crestwood Permian 5.5 6.7 3.3 — Total $ 43.2 $ 38.2 $ 10.2 $ 6.0 (1) In July 2021, we received cash distributions from Tres Holdings and Crestwood Permian of approximately $2.5 million and $3.4 million, respectively. In connection with the anticipated sale of Stagecoach Gas, in July 2021, Stagecoach Gas closed on the sale of certain of its wholly-owned subsidiaries to a subsidiary of Kinder Morgan and distributed to us approximately $613.9 million as our proportionate share of the gross proceeds received from the sale. We utilized approximately $3 million of these proceeds to pay transaction costs related to the sale described above, $40 million of these proceeds to pay our contingent consideration obligation and related accrued interest described below, and the remaining proceeds to repay a portion of the amounts outstanding under the Crestwood Midstream credit facility. Other Contingent Consideration . Pursuant to the Stagecoach Gas limited liability company agreement, we are required to make $57 million of payments to CEGP because certain performance targets on growth capital projects were not achieved by December 31, 2020. During the six months ended June 30, 2021, we paid $19 million to CEGP related to this obligation. At June 30, 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 $2.1 million related to this obligation which is included in accrued expenses and other liabilities on our consolidated balance sheet at June 30, 2021. In July 2021, we repaid all amounts, including accrued interest, related to this obligation.

Risk Management

Risk Management	6 Months Ended
	Jun. 30, 2021
Risk Management - Notional Amounts and Terms of Companys Derivative Financial Instruments [Abstract]
Risk Management	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 7. 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 and six months ended June 30, 2021 and 2020 ( in millions ): Three Months Ended Six Months Ended June 30, June 30, 2021 2020 2021 2020 Product revenues $ 52.7 $ 18.0 $ 167.5 $ 93.0 Gain (loss) reflected in product costs $ (33.3) $ (6.8) $ (41.4) $ 15.2 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: June 30, 2021 December 31, 2020 Fixed Price Fixed Price Fixed Price Fixed Price Propane, ethane, butane, heating oil and crude oil (MMBbls) 66.3 70.6 72.7 76.5 Natural gas (Bcf) 26.1 33.6 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, 85% 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 variation margin requirements with a derivative clearing broker and a third party broker related to our net asset or liability position with each respective 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 ): June 30, 2021 December 31, 2020 Aggregate fair value liability of derivative instruments with credit-risk-related contingent features (1) $ 83.7 $ 38.5 Variation margin-related net derivative asset position $ 124.7 $ 35.9 Variation margin-related cash collateral received $ 99.5 $ 18.3 Cash collateral received, net $ 8.5 $ 12.4

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2021
Fair Value Disclosures [Abstract]
Fair Value Measurements	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 June 30, 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 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 New York Mercantile Exchange 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 June 30, 2021 and December 31, 2020 ( in millions ): June 30, 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 $ 52.4 $ 948.3 $ — $ 1,000.7 $ (873.3) $ (99.8) $ 27.6 Suburban Propane Partners, L.P. units (2) 2.2 — — 2.2 — — 2.2 Total assets at fair value $ 54.6 $ 948.3 $ — $ 1,002.9 $ (873.3) $ (99.8) $ 29.8 Liabilities Liabilities from price risk management $ 41.2 $ 974.0 $ — $ 1,015.2 $ (873.3) $ 8.2 $ 150.1 Total liabilities at fair value $ 41.2 $ 974.0 $ — $ 1,015.2 $ (873.3) $ 8.2 $ 150.1 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 June 30, 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 June 30, 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 ): June 30, 2021 December 31, 2020 Carrying Fair Carrying Fair 2023 Senior Notes $ — $ — $ 683.8 $ 691.5 2025 Senior Notes $ 496.0 $ 514.7 $ 495.5 $ 509.9 2027 Senior Notes $ 593.7 $ 617.7 $ 593.2 $ 594.1 2029 Senior Notes $ 690.2 $ 733.6 $ — $ —

Long-Term Debt

Long-Term Debt	6 Months Ended
	Jun. 30, 2021
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt Long-term debt consisted of the following at June 30, 2021 and December 31, 2020 ( in millions ): June 30, December 31, Credit Facility $ 848.6 $ 719.0 2023 Senior Notes — 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 27.2 22.6 Total debt 2,621.8 2,484.0 Less: current portion 0.2 0.2 Total long-term debt, less current portion $ 2,621.6 $ 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 June 30, 2021, the net debt to consolidated EBITDA ratio was approximately 4.16 to 1.0, the consolidated EBITDA to consolidated interest expense ratio was approximately 4.84 to 1.0, and the senior secured leverage ratio was 1.33 to 1.0. At June 30, 2021, Crestwood Midstream had $366.7 million of available capacity under its credit facility considering the most restrictive debt covenants in its credit agreement. At June 30, 2021 and December 31, 2020, Crestwood Midstream’s outstanding standby letters of credit were $34.7 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 2.33% and 4.50% at June 30, 2021 and 2.40% and 4.50% at December 31, 2020. The weighted-average interest rate on outstanding borrowings as of June 30, 2021 and December 31, 2020 was 2.38% 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 . During the six months ended June 30, 2021, we redeemed $687.2 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 $1.2 million and $6.7 million during the three and six months ended June 30, 2021, and paid approximately $8.6 million of accrued interest on the 2023 Senior Notes on the dates they were repurchased. We funded the repayment using a portion of the proceeds from the issuance of the 2029 Senior Notes and borrowings under the CMLP Credit Facility.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	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 June 30, 2021 and December 31, 2020, we had approximately $36.3 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 within 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 period to comment on the Consent Agreement and is currently reviewing the comments received. We expect to finalize and settle the Consent Agreement after the EPA completes its review and response, if necessary, to the comments received. 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 June 30, 2021. At both June 30, 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 $1.9 million at June 30, 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 June 30, 2021 and December 31, 2020 ( in millions ): CEQP CMLP June 30, December 31, 2020 June 30, December 31, 2020 Self-insurance reserves (1) $ 6.6 $ 7.7 $ 5.7 $ 6.7 (1) At June 30, 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 5. 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 June 30, 2021 and December 31, 2020, we have no amounts accrued for these guarantees.

Leases

Leases	6 Months Ended
	Jun. 30, 2021
Leases [Abstract]
Leases	Leases The following table summarizes the balance sheet information related to our operating and finance leases at June 30, 2021 and December 31, 2020 (in millions ): June 30, December 31, 2020 Operating Leases Operating lease right-of-use assets, net $ 29.6 $ 36.8 Accrued expenses and other liabilities $ 12.0 $ 14.7 Other long-term liabilities 23.3 28.5 Total operating lease liabilities $ 35.3 $ 43.2 Finance Leases Property, plant and equipment $ 12.8 $ 13.3 Less: accumulated depreciation 9.0 7.9 Property, plant and equipment, net $ 3.8 $ 5.4 Accrued expenses and other liabilities $ 2.7 $ 2.9 Other long-term liabilities 0.7 1.9 Total finance lease liabilities $ 3.4 $ 4.8 Lease expense. Our operating lease expense, net totaled $4.3 million and $7.1 million for the three months ended June 30, 2021 and 2020 and $9.1 million and $14.6 million for the six months ended June 30, 2021 and 2020. Our finance lease expense totaled $0.9 million and $1.1 million for the three months ended June 30, 2021 and 2020 and $1.8 million and $2.2 million for the six months ended June 30, 2021 and 2020.
Lessee, Finance Leases	Leases The following table summarizes the balance sheet information related to our operating and finance leases at June 30, 2021 and December 31, 2020 (in millions ): June 30, December 31, 2020 Operating Leases Operating lease right-of-use assets, net $ 29.6 $ 36.8 Accrued expenses and other liabilities $ 12.0 $ 14.7 Other long-term liabilities 23.3 28.5 Total operating lease liabilities $ 35.3 $ 43.2 Finance Leases Property, plant and equipment $ 12.8 $ 13.3 Less: accumulated depreciation 9.0 7.9 Property, plant and equipment, net $ 3.8 $ 5.4 Accrued expenses and other liabilities $ 2.7 $ 2.9 Other long-term liabilities 0.7 1.9 Total finance lease liabilities $ 3.4 $ 4.8 Lease expense. Our operating lease expense, net totaled $4.3 million and $7.1 million for the three months ended June 30, 2021 and 2020 and $9.1 million and $14.6 million for the six months ended June 30, 2021 and 2020. Our finance lease expense totaled $0.9 million and $1.1 million for the three months ended June 30, 2021 and 2020 and $1.8 million and $2.2 million for the six months ended June 30, 2021 and 2020.

Partners' Capital

Partners' Capital	6 Months Ended
	Jun. 30, 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 first quarter of 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 of approximately $7.6 million are reflected as a reduction of CEQP’s common unitholders’ partners’ capital in its consolidated statement of partners’ capital during the first quarter of 2021. Distributions Crestwood Equity Limited Partners. A summary of CEQP’s limited partner quarterly cash distributions for the six months ended June 30, 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 May 7, 2021 May 14, 2021 $ 0.625 39.3 $ 85.7 2020 February 7, 2020 February 14, 2020 $ 0.625 $ 45.3 May 8, 2020 May 15, 2020 $ 0.625 45.7 $ 91.0 On July 15, 2021, we declared a distribution of $0.625 per limited partner unit to be paid on August 13, 2021 to unitholders of record on August 6, 2021 with respect to the quarter ended June 30, 2021. Preferred Unitholders . During the six months ended June 30, 2021 and 2020, we paid cash distributions to our preferred unitholders of approximately $30.0 million in both periods. On July 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 June 30, 2021. Crestwood Midstream During the six months ended June 30, 2021 and 2020, Crestwood Midstream paid cash distributions of $395.4 million and $119.0 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 June 30, 2021 and 2020 (in millions) : Balance at December 31, 2020 $ 432.7 Distributions to non-controlling partner (19.6) Net income attributable to non-controlling partner 20.4 Balance at June 30, 2021 $ 433.5 Balance at December 31, 2019 $ 426.2 Contributions from non-controlling partner 2.8 Distributions to non-controlling partner (18.5) Net income attributable to non-controlling partner 20.1 Balance at June 30, 2020 $ 430.6 In July 2021, Crestwood Niobrara paid cash distributions to Jackalope Holdings of approximately $10.3 million for the quarter ended June 30, 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 June 30, 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 and six months ended June 30, 2021, we recognized compensation expense of less than $0.1 million and $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 Un

Earnings Per Limited Partner Unit	6 Months Ended
	Jun. 30, 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 and six months ended June 30, 2021 and 2020 (in millions) : Three Months Ended Six Months Ended June 30, June 30, 2021 2020 2021 2020 Preferred units (1) 7.1 7.1 7.1 7.1 Crestwood Niobrara’s preferred units (1) 3.6 8.2 3.6 8.2 Unit-based compensation performance units (1) 0.1 0.2 0.1 0.3 Subordinated units (1)(2) — 0.4 0.2 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 11.

Segments

Segments	6 Months Ended
	Jun. 30, 2021
Segment Reporting [Abstract]
Segments	SegmentsWe 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 Six Months Ended Three Months Ended Six Months Ended June 30, June 30, June 30, June 30, 2021 2020 2021 2020 2021 2020 2021 2020 Net loss $ (38.1) $ (24.3) $ (76.4) $ (47.7) $ (38.5) $ (26.8) $ (78.9) $ (52.4) Add: Interest and debt expense, net 35.1 34.0 71.1 66.6 35.1 34.0 71.1 66.6 Loss on modification/extinguishment of debt 1.2 — 6.7 — 1.2 — 6.7 — Provision (benefit) for income taxes 0.1 (0.1) — (0.1) 0.1 (0.2) — (0.2) Depreciation, amortization and accretion 58.8 61.0 118.0 117.1 62.2 64.6 125.0 124.2 EBITDA $ 57.1 $ 70.6 $ 119.4 $ 135.9 $ 60.1 $ 71.6 $ 123.9 $ 138.2 The following tables summarize CEQP’s and CMLP’s reportable segment data for the three and six months ended June 30, 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 reflected in the tables below was approximately $48.1 million and $9.5 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 June 30, 2021 and 2020 and $177.5 million and $23.3 million for the six months ended June 30, 2021 and 2020. Segment EBITDA Information Three Months Ended June 30, 2021 Gathering and Processing Storage and Transportation Marketing, Supply and Logistics Corporate Total Crestwood Midstream Revenues $ 173.3 $ 2.0 $ 754.3 $ — $ 929.6 Intersegment revenues 84.2 3.1 (87.3) — — Costs of product/services sold 120.6 (0.4) 677.0 — 797.2 Operations and maintenance expense 14.7 1.0 10.1 — 25.8 General and administrative expense — — — 19.7 19.7 Gain on long-lived assets, net 0.3 — — — 0.3 Earnings (loss) from unconsolidated affiliates, net 1.0 (28.1) — — (27.1) Crestwood Midstream EBITDA $ 123.5 $ (23.6) $ (20.1) $ (19.7) $ 60.1 Crestwood Equity General and administrative expense — — — 3.1 3.1 Other income, net — — — 0.1 0.1 Crestwood Equity EBITDA $ 123.5 $ (23.6) $ (20.1) $ (22.7) $ 57.1 Three Months Ended June 30, 2020 Gathering and Processing Storage and Transportation Marketing, Supply and Logistics Corporate Total Crestwood Midstream Revenues $ 114.5 $ 3.1 $ 235.1 $ — $ 352.7 Intersegment revenues 14.3 2.4 (16.7) — — Costs of product/services sold 21.3 0.1 204.3 — 225.7 Operations and maintenance expense 19.3 0.7 11.6 — 31.6 General and administrative expense — — — 28.4 28.4 Loss on long-lived assets, net (3.6) — (0.2) — (3.8) Earnings (loss) from unconsolidated affiliates, net (1.0) 9.4 — — 8.4 Crestwood Midstream EBITDA $ 83.6 $ 14.1 $ 2.3 $ (28.4) $ 71.6 Crestwood Equity General and administrative expense — — — 1.1 1.1 Other income, net — — — 0.1 0.1 Crestwood Equity EBITDA $ 83.6 $ 14.1 $ 2.3 $ (29.4) $ 70.6 Six Months Ended June 30, 2021 Gathering and Processing Storage and Transportation Marketing, Supply and Logistics Corporate Total Crestwood Midstream Revenues $ 327.7 $ 4.0 $ 1,630.6 $ — $ 1,962.3 Intersegment revenues 189.5 5.5 (195.0) — — Costs of product/services sold 237.1 — 1,373.9 — 1,611.0 Operations and maintenance expense 36.1 1.6 20.9 — 58.6 General and administrative expense — — — 36.9 36.9 Gain (loss) on long-lived assets, net (1.2) — 0.1 — (1.1) Earnings (loss) from unconsolidated affiliates, net 0.2 (131.0) — — (130.8) Crestwood Midstream EBITDA $ 243.0 $ (123.1) $ 40.9 $ (36.9) $ 123.9 Crestwood Equity General and administrative expense — — — 4.6 4.6 Other income, net — — — 0.1 0.1 Crestwood Equity EBITDA $ 243.0 $ (123.1) $ 40.9 $ (41.4) $ 119.4 Six Months Ended June 30, 2020 Gathering and Processing Storage and Transportation Marketing, Supply and Logistics Corporate Total Crestwood Midstream Revenues $ 329.4 $ 6.6 $ 744.6 $ — $ 1,080.6 Intersegment revenues 54.3 5.0 (59.3) — — Costs of product/services sold 129.6 0.3 630.2 — 760.1 Operations and maintenance expense 46.3 2.1 20.8 — 69.2 General and administrative expense — — — 41.9 41.9 Loss on long-lived assets, net (4.6) — (0.2) — (4.8) Goodwill impairment (80.3) — — — (80.3) Earnings (loss) from unconsolidated affiliates, net (0.2) 14.1 — — 13.9 Crestwood Midstream EBITDA $ 122.7 $ 23.3 $ 34.1 $ (41.9) $ 138.2 Crestwood Equity General and administrative expense — — — 2.5 2.5 Other income, net — — — 0.2 0.2 Crestwood Equity EBITDA $ 122.7 $ 23.3 $ 34.1 $ (44.2) $ 135.9 Other Segment Information CEQP CMLP June 30, 2021 December 31, 2020 June 30, 2021 December 31, 2020 Total Assets Gathering and Processing $ 3,402.2 $ 3,464.6 $ 3,540.2 $ 3,609.7 Storage and Transportation 781.4 944.6 781.4 944.6 Marketing, Supply and Logistics 918.2 805.0 918.2 805.0 Corporate 28.4 29.5 24.6 26.2 Total Assets $ 5,130.2 $ 5,243.7 $ 5,264.4 $ 5,385.5

Revenues

Revenues	6 Months Ended
	Jun. 30, 2021
Revenue Recognition [Abstract]
Revenues	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 Accounting Standards Update 2014-09, Revenue from Contracts with Customers (Topic 606) totaled $298.4 million and $219.9 million for both CEQP and CMLP at June 30, 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) : June 30, 2021 December 31, 2020 Contract assets (non-current) $ 1.5 $ 1.0 Contract liabilities (current) (1) $ 10.5 $ 10.3 Contract liabilities (non-current) (1) $ 179.2 $ 172.2 (1) During the three and six months ended June 30, 2021, we recognized revenues of approximately $3.3 million and $6.4 million that were previously included in contract liabilities at December 31, 2020. The remaining change in our contract liabilities during the three and six months ended June 30, 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 June 30, 2021 (in millions) : Remainder of 2021 $ 46.5 2022 76.0 2023 52.6 2024 31.7 Total $ 206.8 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 and six months ended June 30, 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 June 30, 2021 Gathering and Processing Storage and Transportation Marketing, Supply and Logistics Intersegment Elimination Total Topic 606 revenues Gathering Natural gas $ 33.3 $ — $ — $ — $ 33.3 Crude oil 18.4 — — — 18.4 Water 22.7 — — — 22.7 Processing Natural gas 7.3 — — — 7.3 Compression Natural gas 3.7 — — — 3.7 Storage Crude oil 0.1 0.9 — (0.9) 0.1 NGLs — — 2.4 — 2.4 Pipeline Crude oil — 1.7 — (1.1) 0.6 NGLs — — 0.1 — 0.1 Transportation Crude oil 0.4 — — — 0.4 NGLs — — 4.2 — 4.2 Rail Loading Crude oil — 2.3 — (1.1) 1.2 Product Sales Natural gas 26.8 — 44.3 (26.8) 44.3 Crude oil 101.7 — 344.4 (14.7) 431.4 NGLs 42.9 — 304.8 (42.6) 305.1 Other — 0.2 0.6 (0.1) 0.7 Total Topic 606 revenues 257.3 5.1 700.8 (87.3) 875.9 Non-Topic 606 revenues 0.2 — 53.5 — 53.7 Total revenues $ 257.5 $ 5.1 $ 754.3 $ (87.3) $ 929.6 Three Months Ended June 30, 2020 Gathering and Processing Storage and Transportation Marketing, Supply and Logistics Intersegment Elimination Total Topic 606 revenues Gathering Natural gas $ 33.2 $ — $ — $ — $ 33.2 Crude oil 17.9 — — — 17.9 Water 18.3 — — — 18.3 Processing Natural gas 7.1 — — — 7.1 Compression Natural gas 5.7 — — — 5.7 Storage Crude oil 0.4 1.1 — (0.8) 0.7 NGLs — — 3.6 — 3.6 Pipeline Crude oil — 1.3 — (0.4) 0.9 NGLs — — 0.2 — 0.2 Transportation Crude oil 1.5 — 0.3 — 1.8 NGLs — — 2.6 — 2.6 Rail Loading Crude oil — 2.9 — (1.2) 1.7 Product Sales Natural gas 6.9 — 15.5 (6.8) 15.6 Crude oil 34.8 — 102.0 (7.1) 129.7 NGLs 3.0 — 92.4 (0.3) 95.1 Other — 0.2 0.2 (0.1) 0.3 Total Topic 606 revenues 128.8 5.5 216.8 (16.7) 334.4 Non-Topic 606 revenues — — 18.3 — 18.3 Total revenues $ 128.8 $ 5.5 $ 235.1 $ (16.7) $ 352.7 Six Months Ended June 30, 2021 Gathering and Processing Storage and Transportation Marketing, Supply and Logistics Intersegment Elimination Total Topic 606 revenues Gathering Natural gas $ 64.7 $ — $ — $ — $ 64.7 Crude oil 39.1 — — — 39.1 Water 44.7 — — — 44.7 Processing Natural gas 14.3 — — — 14.3 Compression Natural gas 8.4 — — — 8.4 Storage Crude oil 0.2 1.5 — (1.4) 0.3 NGLs — — 6.1 — 6.1 Pipeline Crude oil — 3.0 — (1.6) 1.4 NGLs — — 0.1 — 0.1 Transportation Crude oil 1.1 — — — 1.1 NGLs — — 8.4 — 8.4 Rail Loading Crude oil — 4.6 — (2.4) 2.2 Product Sales Natural gas 69.6 — 139.9 (69.0) 140.5 Crude oil 191.7 — 595.6 (37.4) 749.9 NGLs 83.2 — 710.8 (82.9) 711.1 Other — 0.4 0.8 (0.3) 0.9 Total Topic 606 revenues 517.0 9.5 1,461.7 (195.0) 1,793.2 Non-Topic 606 revenues 0.2 — 168.9 — 169.1 Total revenues $ 517.2 $ 9.5 $ 1,630.6 $ (195.0) $ 1,962.3 Six Months Ended June 30, 2020 Gathering and Processing Storage and Transportation Marketing, Supply and Logistics Intersegment Elimination Total Topic 606 revenues Gathering Natural gas $ 77.0 $ — $ — $ — $ 77.0 Crude oil 44.4 — — — 44.4 Water 41.3 — — — 41.3 Processing Natural gas 17.3 — — — 17.3 Compression Natural gas 12.0 — — — 12.0 Storage Crude oil 0.9 1.7 — (1.2) 1.4 NGLs — — 5.2 — 5.2 Pipeline Crude oil — 2.9 — (0.9) 2.0 NGLs — — 0.2 — 0.2 Transportation Crude oil 3.5 — 1.9 — 5.4 NGLs — — 4.3 — 4.3 Rail Loading Crude oil — 6.3 — (2.6) 3.7 Product Sales Natural gas 18.9 — 33.8 (18.5) 34.2 Crude oil 155.9 — 352.2 (23.4) 484.7 NGLs 12.5 — 252.7 (12.2) 253.0 Other — 0.7 0.7 (0.5) 0.9 Total Topic 606 revenues 383.7 11.6 651.0 (59.3) 987.0 Non-Topic 606 revenues — — 93.6 — 93.6 Total revenues $ 383.7 $ 11.6 $ 744.6 $ (59.3) $ 1,080.6

Related Party Transactions

Related Party Transactions	6 Months Ended
	Jun. 30, 2021
Related Party Transactions [Abstract]
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 six months ended June 30, 2021 and 2020, we paid approximately $0.5 million and $2.9 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 Six Months Ended June 30, June 30, 2021 2020 2021 2020 Revenues at CEQP and CMLP (1) $ 13.2 $ 7.5 $ 18.1 $ 15.0 Costs of product/services sold at CEQP and CMLP (2) $ 25.4 $ 3.6 $ 66.5 $ 6.8 Operations and maintenance expenses charged by CEQP and CMLP (3) $ 6.0 $ 5.5 $ 11.7 $ 11.7 General and administrative expenses charged by CEQP to CMLP, net (4) $ 6.6 $ 10.9 $ 12.5 $ 18.0 General and administrative expenses at CEQP charged to (from) Crestwood Holdings, net (5) $ — $ (1.5) $ 4.8 $ 11.3 (1) Primarily relates to the sale of NGLs to a subsidiary of Crestwood Permian. (2) Includes (i) $14.8 million and $45.1 million during the three and six months ended June 30, 2021 and $3.2 million and $6.4 million during the three and six months ended June 30, 2020 related to purchases of natural gas and NGLs from a subsidiary of Crestwood Permian; (ii) $0.3 million and $11.1 million during the three and six months ended June 30, 2021 and $0.1 million during both the three and six months ended June 30, 2020 related to purchases of natural gas from a subsidiary of Tres Holdings and (iii) $10.3 million during both the three and six months ended June 30, 2021 and $0.3 million during both the three and six months ended June 30, 2020 related to purchases of NGLs from Ascent Resources - Utica, LLC, an affiliate of Crestwood 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 and six months ended June 30, 2021, we charged $1.6 million and $3.3 million to Stagecoach Gas, $1.2 million and $2.4 million to Tres Holdings, and $3.2 million and $6.0 million to Crestwood Permian. During the three and six months ended June 30, 2020, we charged $1.6 million and $3.3 million to Stagecoach Gas, $1.1 million and $2.2 million to Tres Holdings, and $2.8 million and $6.2 million to Crestwood Permian. (4) Includes $7.6 million and $14.5 million of unit-based compensation charges allocated from CEQP to CMLP for the three and six months ended June 30, 2021 and $11.9 million and $20.1 million for the three and six months ended June 30, 2020. In addition, includes $1.0 million and $2.0 million of CMLP’s general and administrative costs allocated to CEQP during the three and six months ended June 30, 2021 and $1.0 million and $2.1 million during the three and six months ended June 30, 2020. (5) Includes $1.7 million of unit-based compensation charges allocated from Crestwood Holdings to CEQP and CMLP during the three months ended June 30, 2020. Also includes a $4.6 million and a $10.9 million reduction of unit-based compensation charges allocated from Crestwood Holdings to CEQP and CMLP during the six months ended June 30, 2021 and 2020. During the three months ended June 30, 2021, there were no unit-based compensation charges allocated from Crestwood Holdings to CEQP and CMLP. CEQP allocates a portion of its general and administrative costs to Crestwood Holdings and during the six months ended June 30, 2021, CEQP allocated $0.2 million of it’s general and administrative costs to Crestwood Holdings and approximately $0.2 million and $0.4 million of costs were allocated to Crestwood Holdings during the three and six months ended June 30, 2020. During the three months ended June 30, 2021, CEQP did not allocate any general and administrative costs to Crestwood Holdings. The following table shows accounts receivable and accounts payable with our affiliates ( in millions ): June 30, December 31, Accounts receivable at CEQP and CMLP $ 7.0 $ 2.5 Accounts payable at CEQP (1) $ 11.3 $ 7.5 Accounts payable at CMLP $ 11.3 $ 5.0 (1) In conjunction with the Crestwood Holdings Transactions discussed in Note 1, CEQP eliminated approximately $2.4 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 first quarter of 2021.

Basis of Presentation and Sum_2

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 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 six months ended June 30, 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 Informa_2

Certain Balance Sheet Information (Tables)	6 Months Ended
	Jun. 30, 2021
Balance Sheet Related Disclosures [Abstract]
Schedule of Accrued Liabilities	Accrued expenses and other liabilities consisted of the following ( in millions ): CEQP CMLP June 30, December 31, June 30, December 31, 2021 2020 2021 2020 Accrued expenses $ 50.9 $ 48.3 $ 49.4 $ 46.4 Accrued property taxes 6.3 8.4 6.3 8.4 Income tax payable 0.2 0.2 0.2 0.2 Interest payable 32.4 24.9 32.4 24.9 Accrued additions to property, plant and equipment 39.8 12.3 39.8 12.3 Operating leases 12.0 14.7 12.0 14.7 Finance leases 2.7 2.9 2.7 2.9 Deferred revenue 10.5 10.3 10.5 10.3 Total accrued expenses and other liabilities $ 154.8 $ 122.0 $ 153.3 $ 120.1
Schedule of Other Long-Term Liabilities	Other long-term liabilities consisted of the following ( in millions ): CEQP CMLP June 30, December 31, June 30, December 31, 2021 2020 2021 2020 Contract liabilities $ 179.2 $ 172.2 $ 179.2 $ 172.2 Operating leases 23.3 28.5 23.3 28.5 Asset retirement obligations 35.1 34.1 35.1 34.1 Other 17.3 18.5 15.0 17.0 Total other long-term liabilities $ 254.9 $ 253.3 $ 252.6 $ 251.8

Investments in Unconsolidated_2

Investments in Unconsolidated Affiliates (Tables)	6 Months Ended
	Jun. 30, 2021
Equity Method Investments and Joint Ventures [Abstract]
Equity Method Investments	Net Investments and Earnings (Loss) Our net investments in and earnings (loss) from our unconsolidated affiliates are as follows ( in millions ): Investment Earnings (Loss) from Earnings (Loss) from Three Months Ended Six Months Ended June 30, December 31, June 30, June 30, 2021 2020 2021 2020 2021 2020 Stagecoach Gas Services LLC (1) $ 628.2 $ 792.5 $ (28.0) $ 9.2 $ (140.3) $ 18.4 Tres Palacios Holdings LLC (2) 41.0 35.5 (0.1) 0.1 9.2 0.1 Powder River Basin Industrial Complex, LLC (3) 3.6 3.6 — 0.1 0.1 (4.4) Crestwood Permian Basin Holdings LLC (4) 110.1 112.1 1.0 (1.0) 0.2 (0.2) Total $ 782.9 $ 943.7 $ (27.1) $ 8.4 $ (130.8) $ 13.9 (1) As of June 30, 2021, our equity in the underlying net assets of Stagecoach Gas Services LLC (Stagecoach Gas) approximates the carrying value of our investment. During the six months ended June 30, 2021, we and the other 50% owner of Stagecoach Gas, Con Edison Gas Pipeline and Storage Northeast, LLC (CEGP) entered into an agreement to sell Stagecoach Gas to a subsidiary of Kinder Morgan, Inc. (Kinder Morgan) in a series of transactions. Based on these anticipated transactions, we recorded our share of a loss on long-lived assets (including goodwill) recorded by our Stagecoach Gas equity investment associated with the anticipated sale. 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 $35.5 million and $155.4 million reduction in our earnings from unconsolidated affiliates during the three and six months ended June 30, 2021. In addition, our earnings from unconsolidated affiliates during the three and six months ended June 30, 2021 were also reduced by our proportionate share of transaction costs of approximately $3.0 million related to the anticipated sale, which were paid by us in July 2021 on behalf of Stagecoach Gas. Our Stagecoach Gas investment is included in our storage and transportation segment. (2) As of June 30, 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 $22.1 million. During both the three and six months ended June 30, 2021 and 2020, we recorded amortization of approximately $0.3 million and $0.6 million, respectively, 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 June 30, 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 six months ended June 30, 2020. Our PRBIC investment is included in our storage and transportation segment. (4) As of June 30, 2021, our equity in the underlying net assets of Crestwood Permian exceeded our investment balance by $7.7 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 ): Six Months Ended June 30, 2021 2020 Operating Revenues Operating Expenses Net Income (Loss) Operating Revenues Operating Expenses Net Income (Loss) Stagecoach Gas $ 77.5 $ 454.9 $ (377.4) $ 75.6 $ 38.9 $ 36.8 Other (1) 135.1 118.0 17.6 53.5 76.1 (21.6) Total $ 212.6 $ 572.9 $ (359.8) $ 129.1 $ 115.0 $ 15.2 (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 Six Months Ended Six Months Ended June 30, June 30, 2021 2020 2021 2020 Stagecoach Gas $ 27.0 $ 30.0 $ — $ — Tres Holdings 10.6 1.4 6.9 6.0 PRBIC 0.1 0.1 — — Crestwood Permian 5.5 6.7 3.3 — Total $ 43.2 $ 38.2 $ 10.2 $ 6.0 (1) In July 2021, we received cash distributions from Tres Holdings and Crestwood Permian of approximately $2.5 million and $3.4 million, respectively. In connection with the anticipated sale of Stagecoach Gas, in July 2021, Stagecoach Gas closed on the sale of certain of its wholly-owned subsidiaries to a subsidiary of Kinder Morgan and distributed to us approximately $613.9 million as our proportionate share of the gross proceeds received from the sale. We utilized approximately $3 million of these proceeds to pay transaction costs related to the sale described above, $40 million of these proceeds to pay our contingent consideration obligation and related accrued interest described below, and the remaining proceeds to repay a portion of the amounts outstanding under the Crestwood Midstream credit facility.

Risk Management (Tables)

Risk Management (Tables)	6 Months Ended
	Jun. 30, 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 and six months ended June 30, 2021 and 2020 ( in millions ): Three Months Ended Six Months Ended June 30, June 30, 2021 2020 2021 2020 Product revenues $ 52.7 $ 18.0 $ 167.5 $ 93.0 Gain (loss) reflected in product costs $ (33.3) $ (6.8) $ (41.4) $ 15.2
Notional Amounts And Terms Of Company's Derivative Financial Instruments	The notional amounts of our derivative financial instruments include the following: June 30, 2021 December 31, 2020 Fixed Price Fixed Price Fixed Price Fixed Price Propane, ethane, butane, heating oil and crude oil (MMBbls) 66.3 70.6 72.7 76.5 Natural gas (Bcf) 26.1 33.6 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 ): June 30, 2021 December 31, 2020 Aggregate fair value liability of derivative instruments with credit-risk-related contingent features (1) $ 83.7 $ 38.5 Variation margin-related net derivative asset position $ 124.7 $ 35.9 Variation margin-related cash collateral received $ 99.5 $ 18.3 Cash collateral received, net $ 8.5 $ 12.4

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2021
Fair Value Disclosures [Abstract]
Assets And Liabilities Measured At Fair Value On Recurring Basis	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 June 30, 2021 and December 31, 2020 ( in millions ): June 30, 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 $ 52.4 $ 948.3 $ — $ 1,000.7 $ (873.3) $ (99.8) $ 27.6 Suburban Propane Partners, L.P. units (2) 2.2 — — 2.2 — — 2.2 Total assets at fair value $ 54.6 $ 948.3 $ — $ 1,002.9 $ (873.3) $ (99.8) $ 29.8 Liabilities Liabilities from price risk management $ 41.2 $ 974.0 $ — $ 1,015.2 $ (873.3) $ 8.2 $ 150.1 Total liabilities at fair value $ 41.2 $ 974.0 $ — $ 1,015.2 $ (873.3) $ 8.2 $ 150.1 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 ): June 30, 2021 December 31, 2020 Carrying Fair Carrying Fair 2023 Senior Notes $ — $ — $ 683.8 $ 691.5 2025 Senior Notes $ 496.0 $ 514.7 $ 495.5 $ 509.9 2027 Senior Notes $ 593.7 $ 617.7 $ 593.2 $ 594.1 2029 Senior Notes $ 690.2 $ 733.6 $ — $ —

Long-Term Debt (Tables)

Long-Term Debt (Tables)	6 Months Ended
	Jun. 30, 2021
Debt Disclosure [Abstract]
Components Of Long-Term Debt	Long-term debt consisted of the following at June 30, 2021 and December 31, 2020 ( in millions ): June 30, December 31, Credit Facility $ 848.6 $ 719.0 2023 Senior Notes — 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 27.2 22.6 Total debt 2,621.8 2,484.0 Less: current portion 0.2 0.2 Total long-term debt, less current portion $ 2,621.6 $ 2,483.8 (1) Represents non-interest bearing obligations related to certain companies acquired in 2014 with payments due through 2022.

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Summary of Self-Insurance Reserves	The following table summarizes CEQP’s and CMLP’s self-insurance reserves at June 30, 2021 and December 31, 2020 ( in millions ): CEQP CMLP June 30, December 31, 2020 June 30, December 31, 2020 Self-insurance reserves (1) $ 6.6 $ 7.7 $ 5.7 $ 6.7 (1) At June 30, 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)

Leases (Tables)	6 Months Ended
	Jun. 30, 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 June 30, 2021 and December 31, 2020 (in millions ): June 30, December 31, 2020 Operating Leases Operating lease right-of-use assets, net $ 29.6 $ 36.8 Accrued expenses and other liabilities $ 12.0 $ 14.7 Other long-term liabilities 23.3 28.5 Total operating lease liabilities $ 35.3 $ 43.2 Finance Leases Property, plant and equipment $ 12.8 $ 13.3 Less: accumulated depreciation 9.0 7.9 Property, plant and equipment, net $ 3.8 $ 5.4 Accrued expenses and other liabilities $ 2.7 $ 2.9 Other long-term liabilities 0.7 1.9 Total finance lease liabilities $ 3.4 $ 4.8

Partners' Capital (Tables)

Partners' Capital (Tables)	6 Months Ended
	Jun. 30, 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 six months ended June 30, 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 May 7, 2021 May 14, 2021 $ 0.625 39.3 $ 85.7 2020 February 7, 2020 February 14, 2020 $ 0.625 $ 45.3 May 8, 2020 May 15, 2020 $ 0.625 45.7 $ 91.0
Summary of Change in Non-Controlling Interest in Subsidiary	The following table shows the change in our non-controlling interest in subsidiary at June 30, 2021 and 2020 (in millions) : Balance at December 31, 2020 $ 432.7 Distributions to non-controlling partner (19.6) Net income attributable to non-controlling partner 20.4 Balance at June 30, 2021 $ 433.5 Balance at December 31, 2019 $ 426.2 Contributions from non-controlling partner 2.8 Distributions to non-controlling partner (18.5) Net income attributable to non-controlling partner 20.1 Balance at June 30, 2020 $ 430.6

Earnings Per Limited Partner _2

Earnings Per Limited Partner Unit (Tables)	6 Months Ended
	Jun. 30, 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 and six months ended June 30, 2021 and 2020 (in millions) : Three Months Ended Six Months Ended June 30, June 30, 2021 2020 2021 2020 Preferred units (1) 7.1 7.1 7.1 7.1 Crestwood Niobrara’s preferred units (1) 3.6 8.2 3.6 8.2 Unit-based compensation performance units (1) 0.1 0.2 0.1 0.3 Subordinated units (1)(2) — 0.4 0.2 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 11.

Segments (Tables)

Segments (Tables)	6 Months Ended
	Jun. 30, 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 Six Months Ended Three Months Ended Six Months Ended June 30, June 30, June 30, June 30, 2021 2020 2021 2020 2021 2020 2021 2020 Net loss $ (38.1) $ (24.3) $ (76.4) $ (47.7) $ (38.5) $ (26.8) $ (78.9) $ (52.4) Add: Interest and debt expense, net 35.1 34.0 71.1 66.6 35.1 34.0 71.1 66.6 Loss on modification/extinguishment of debt 1.2 — 6.7 — 1.2 — 6.7 — Provision (benefit) for income taxes 0.1 (0.1) — (0.1) 0.1 (0.2) — (0.2) Depreciation, amortization and accretion 58.8 61.0 118.0 117.1 62.2 64.6 125.0 124.2 EBITDA $ 57.1 $ 70.6 $ 119.4 $ 135.9 $ 60.1 $ 71.6 $ 123.9 $ 138.2
Summary Of Segment Information	The following tables summarize CEQP’s and CMLP’s reportable segment data for the three and six months ended June 30, 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 reflected in the tables below was approximately $48.1 million and $9.5 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 June 30, 2021 and 2020 and $177.5 million and $23.3 million for the six months ended June 30, 2021 and 2020. Segment EBITDA Information Three Months Ended June 30, 2021 Gathering and Processing Storage and Transportation Marketing, Supply and Logistics Corporate Total Crestwood Midstream Revenues $ 173.3 $ 2.0 $ 754.3 $ — $ 929.6 Intersegment revenues 84.2 3.1 (87.3) — — Costs of product/services sold 120.6 (0.4) 677.0 — 797.2 Operations and maintenance expense 14.7 1.0 10.1 — 25.8 General and administrative expense — — — 19.7 19.7 Gain on long-lived assets, net 0.3 — — — 0.3 Earnings (loss) from unconsolidated affiliates, net 1.0 (28.1) — — (27.1) Crestwood Midstream EBITDA $ 123.5 $ (23.6) $ (20.1) $ (19.7) $ 60.1 Crestwood Equity General and administrative expense — — — 3.1 3.1 Other income, net — — — 0.1 0.1 Crestwood Equity EBITDA $ 123.5 $ (23.6) $ (20.1) $ (22.7) $ 57.1 Three Months Ended June 30, 2020 Gathering and Processing Storage and Transportation Marketing, Supply and Logistics Corporate Total Crestwood Midstream Revenues $ 114.5 $ 3.1 $ 235.1 $ — $ 352.7 Intersegment revenues 14.3 2.4 (16.7) — — Costs of product/services sold 21.3 0.1 204.3 — 225.7 Operations and maintenance expense 19.3 0.7 11.6 — 31.6 General and administrative expense — — — 28.4 28.4 Loss on long-lived assets, net (3.6) — (0.2) — (3.8) Earnings (loss) from unconsolidated affiliates, net (1.0) 9.4 — — 8.4 Crestwood Midstream EBITDA $ 83.6 $ 14.1 $ 2.3 $ (28.4) $ 71.6 Crestwood Equity General and administrative expense — — — 1.1 1.1 Other income, net — — — 0.1 0.1 Crestwood Equity EBITDA $ 83.6 $ 14.1 $ 2.3 $ (29.4) $ 70.6 Six Months Ended June 30, 2021 Gathering and Processing Storage and Transportation Marketing, Supply and Logistics Corporate Total Crestwood Midstream Revenues $ 327.7 $ 4.0 $ 1,630.6 $ — $ 1,962.3 Intersegment revenues 189.5 5.5 (195.0) — — Costs of product/services sold 237.1 — 1,373.9 — 1,611.0 Operations and maintenance expense 36.1 1.6 20.9 — 58.6 General and administrative expense — — — 36.9 36.9 Gain (loss) on long-lived assets, net (1.2) — 0.1 — (1.1) Earnings (loss) from unconsolidated affiliates, net 0.2 (131.0) — — (130.8) Crestwood Midstream EBITDA $ 243.0 $ (123.1) $ 40.9 $ (36.9) $ 123.9 Crestwood Equity General and administrative expense — — — 4.6 4.6 Other income, net — — — 0.1 0.1 Crestwood Equity EBITDA $ 243.0 $ (123.1) $ 40.9 $ (41.4) $ 119.4 Six Months Ended June 30, 2020 Gathering and Processing Storage and Transportation Marketing, Supply and Logistics Corporate Total Crestwood Midstream Revenues $ 329.4 $ 6.6 $ 744.6 $ — $ 1,080.6 Intersegment revenues 54.3 5.0 (59.3) — — Costs of product/services sold 129.6 0.3 630.2 — 760.1 Operations and maintenance expense 46.3 2.1 20.8 — 69.2 General and administrative expense — — — 41.9 41.9 Loss on long-lived assets, net (4.6) — (0.2) — (4.8) Goodwill impairment (80.3) — — — (80.3) Earnings (loss) from unconsolidated affiliates, net (0.2) 14.1 — — 13.9 Crestwood Midstream EBITDA $ 122.7 $ 23.3 $ 34.1 $ (41.9) $ 138.2 Crestwood Equity General and administrative expense — — — 2.5 2.5 Other income, net — — — 0.2 0.2 Crestwood Equity EBITDA $ 122.7 $ 23.3 $ 34.1 $ (44.2) $ 135.9 Other Segment Information CEQP CMLP June 30, 2021 December 31, 2020 June 30, 2021 December 31, 2020 Total Assets Gathering and Processing $ 3,402.2 $ 3,464.6 $ 3,540.2 $ 3,609.7 Storage and Transportation 781.4 944.6 781.4 944.6 Marketing, Supply and Logistics 918.2 805.0 918.2 805.0 Corporate 28.4 29.5 24.6 26.2 Total Assets $ 5,130.2 $ 5,243.7 $ 5,264.4 $ 5,385.5

Revenue Recognition (Tables)

Revenue Recognition (Tables)	6 Months Ended
	Jun. 30, 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) : June 30, 2021 December 31, 2020 Contract assets (non-current) $ 1.5 $ 1.0 Contract liabilities (current) (1) $ 10.5 $ 10.3 Contract liabilities (non-current) (1) $ 179.2 $ 172.2 (1) During the three and six months ended June 30, 2021, we recognized revenues of approximately $3.3 million and $6.4 million that were previously included in contract liabilities at December 31, 2020. The remaining change in our contract liabilities during the three and six months ended June 30, 2021, related to capital reimbursements associated with our revenue contracts and revenue deferrals associated with our contracts with increasing (decreasing) rates.
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 June 30, 2021 (in millions) : Remainder of 2021 $ 46.5 2022 76.0 2023 52.6 2024 31.7 Total $ 206.8
Disaggregation of Revenue	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 and six months ended June 30, 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 June 30, 2021 Gathering and Processing Storage and Transportation Marketing, Supply and Logistics Intersegment Elimination Total Topic 606 revenues Gathering Natural gas $ 33.3 $ — $ — $ — $ 33.3 Crude oil 18.4 — — — 18.4 Water 22.7 — — — 22.7 Processing Natural gas 7.3 — — — 7.3 Compression Natural gas 3.7 — — — 3.7 Storage Crude oil 0.1 0.9 — (0.9) 0.1 NGLs — — 2.4 — 2.4 Pipeline Crude oil — 1.7 — (1.1) 0.6 NGLs — — 0.1 — 0.1 Transportation Crude oil 0.4 — — — 0.4 NGLs — — 4.2 — 4.2 Rail Loading Crude oil — 2.3 — (1.1) 1.2 Product Sales Natural gas 26.8 — 44.3 (26.8) 44.3 Crude oil 101.7 — 344.4 (14.7) 431.4 NGLs 42.9 — 304.8 (42.6) 305.1 Other — 0.2 0.6 (0.1) 0.7 Total Topic 606 revenues 257.3 5.1 700.8 (87.3) 875.9 Non-Topic 606 revenues 0.2 — 53.5 — 53.7 Total revenues $ 257.5 $ 5.1 $ 754.3 $ (87.3) $ 929.6 Three Months Ended June 30, 2020 Gathering and Processing Storage and Transportation Marketing, Supply and Logistics Intersegment Elimination Total Topic 606 revenues Gathering Natural gas $ 33.2 $ — $ — $ — $ 33.2 Crude oil 17.9 — — — 17.9 Water 18.3 — — — 18.3 Processing Natural gas 7.1 — — — 7.1 Compression Natural gas 5.7 — — — 5.7 Storage Crude oil 0.4 1.1 — (0.8) 0.7 NGLs — — 3.6 — 3.6 Pipeline Crude oil — 1.3 — (0.4) 0.9 NGLs — — 0.2 — 0.2 Transportation Crude oil 1.5 — 0.3 — 1.8 NGLs — — 2.6 — 2.6 Rail Loading Crude oil — 2.9 — (1.2) 1.7 Product Sales Natural gas 6.9 — 15.5 (6.8) 15.6 Crude oil 34.8 — 102.0 (7.1) 129.7 NGLs 3.0 — 92.4 (0.3) 95.1 Other — 0.2 0.2 (0.1) 0.3 Total Topic 606 revenues 128.8 5.5 216.8 (16.7) 334.4 Non-Topic 606 revenues — — 18.3 — 18.3 Total revenues $ 128.8 $ 5.5 $ 235.1 $ (16.7) $ 352.7 Six Months Ended June 30, 2021 Gathering and Processing Storage and Transportation Marketing, Supply and Logistics Intersegment Elimination Total Topic 606 revenues Gathering Natural gas $ 64.7 $ — $ — $ — $ 64.7 Crude oil 39.1 — — — 39.1 Water 44.7 — — — 44.7 Processing Natural gas 14.3 — — — 14.3 Compression Natural gas 8.4 — — — 8.4 Storage Crude oil 0.2 1.5 — (1.4) 0.3 NGLs — — 6.1 — 6.1 Pipeline Crude oil — 3.0 — (1.6) 1.4 NGLs — — 0.1 — 0.1 Transportation Crude oil 1.1 — — — 1.1 NGLs — — 8.4 — 8.4 Rail Loading Crude oil — 4.6 — (2.4) 2.2 Product Sales Natural gas 69.6 — 139.9 (69.0) 140.5 Crude oil 191.7 — 595.6 (37.4) 749.9 NGLs 83.2 — 710.8 (82.9) 711.1 Other — 0.4 0.8 (0.3) 0.9 Total Topic 606 revenues 517.0 9.5 1,461.7 (195.0) 1,793.2 Non-Topic 606 revenues 0.2 — 168.9 — 169.1 Total revenues $ 517.2 $ 9.5 $ 1,630.6 $ (195.0) $ 1,962.3 Six Months Ended June 30, 2020 Gathering and Processing Storage and Transportation Marketing, Supply and Logistics Intersegment Elimination Total Topic 606 revenues Gathering Natural gas $ 77.0 $ — $ — $ — $ 77.0 Crude oil 44.4 — — — 44.4 Water 41.3 — — — 41.3 Processing Natural gas 17.3 — — — 17.3 Compression Natural gas 12.0 — — — 12.0 Storage Crude oil 0.9 1.7 — (1.2) 1.4 NGLs — — 5.2 — 5.2 Pipeline Crude oil — 2.9 — (0.9) 2.0 NGLs — — 0.2 — 0.2 Transportation Crude oil 3.5 — 1.9 — 5.4 NGLs — — 4.3 — 4.3 Rail Loading Crude oil — 6.3 — (2.6) 3.7 Product Sales Natural gas 18.9 — 33.8 (18.5) 34.2 Crude oil 155.9 — 352.2 (23.4) 484.7 NGLs 12.5 — 252.7 (12.2) 253.0 Other — 0.7 0.7 (0.5) 0.9 Total Topic 606 revenues 383.7 11.6 651.0 (59.3) 987.0 Non-Topic 606 revenues — — 93.6 — 93.6 Total revenues $ 383.7 $ 11.6 $ 744.6 $ (59.3) $ 1,080.6

Related Party Transactions (Tab

Related Party Transactions (Tables)	6 Months Ended
	Jun. 30, 2021
Related Party Transactions [Abstract]
Schedule of Related Party Transactions	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 Six Months Ended June 30, June 30, 2021 2020 2021 2020 Revenues at CEQP and CMLP (1) $ 13.2 $ 7.5 $ 18.1 $ 15.0 Costs of product/services sold at CEQP and CMLP (2) $ 25.4 $ 3.6 $ 66.5 $ 6.8 Operations and maintenance expenses charged by CEQP and CMLP (3) $ 6.0 $ 5.5 $ 11.7 $ 11.7 General and administrative expenses charged by CEQP to CMLP, net (4) $ 6.6 $ 10.9 $ 12.5 $ 18.0 General and administrative expenses at CEQP charged to (from) Crestwood Holdings, net (5) $ — $ (1.5) $ 4.8 $ 11.3 (1) Primarily relates to the sale of NGLs to a subsidiary of Crestwood Permian. (2) Includes (i) $14.8 million and $45.1 million during the three and six months ended June 30, 2021 and $3.2 million and $6.4 million during the three and six months ended June 30, 2020 related to purchases of natural gas and NGLs from a subsidiary of Crestwood Permian; (ii) $0.3 million and $11.1 million during the three and six months ended June 30, 2021 and $0.1 million during both the three and six months ended June 30, 2020 related to purchases of natural gas from a subsidiary of Tres Holdings and (iii) $10.3 million during both the three and six months ended June 30, 2021 and $0.3 million during both the three and six months ended June 30, 2020 related to purchases of NGLs from Ascent Resources - Utica, LLC, an affiliate of Crestwood 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 and six months ended June 30, 2021, we charged $1.6 million and $3.3 million to Stagecoach Gas, $1.2 million and $2.4 million to Tres Holdings, and $3.2 million and $6.0 million to Crestwood Permian. During the three and six months ended June 30, 2020, we charged $1.6 million and $3.3 million to Stagecoach Gas, $1.1 million and $2.2 million to Tres Holdings, and $2.8 million and $6.2 million to Crestwood Permian. (4) Includes $7.6 million and $14.5 million of unit-based compensation charges allocated from CEQP to CMLP for the three and six months ended June 30, 2021 and $11.9 million and $20.1 million for the three and six months ended June 30, 2020. In addition, includes $1.0 million and $2.0 million of CMLP’s general and administrative costs allocated to CEQP during the three and six months ended June 30, 2021 and $1.0 million and $2.1 million during the three and six months ended June 30, 2020. (5) Includes $1.7 million of unit-based compensation charges allocated from Crestwood Holdings to CEQP and CMLP during the three months ended June 30, 2020. Also includes a $4.6 million and a $10.9 million reduction of unit-based compensation charges allocated from Crestwood Holdings to CEQP and CMLP during the six months ended June 30, 2021 and 2020. During the three months ended June 30, 2021, there were no unit-based compensation charges allocated from Crestwood Holdings to CEQP and CMLP. CEQP allocates a portion of its general and administrative costs to Crestwood Holdings and during the six months ended June 30, 2021, CEQP allocated $0.2 million of it’s general and administrative costs to Crestwood Holdings and approximately $0.2 million and $0.4 million of costs were allocated to Crestwood Holdings during the three and six months ended June 30, 2020. During the three months ended June 30, 2021, CEQP did not allocate any general and administrative costs to Crestwood Holdings.
Schedule of Related Party Receivables and Payables	The following table shows accounts receivable and accounts payable with our affiliates ( in millions ): June 30, December 31, Accounts receivable at CEQP and CMLP $ 7.0 $ 2.5 Accounts payable at CEQP (1) $ 11.3 $ 7.5 Accounts payable at CMLP $ 11.3 $ 5.0

Organization and Business Des_2

Organization and Business Description (Details) shares in Millions, $ in Millions	1 Months Ended	6 Months Ended
	Mar. 31, 2021USD ($)shares	Jun. 30, 2021segment
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 Sum_3

Basis of Presentation and Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Summary Of Significant Accounting Policies [Line Items]
Goodwill impairment	$ 0	$ 0	$ 0	$ 80.3
Powder River Basin [Member]
Summary Of Significant Accounting Policies [Line Items]
Goodwill impairment				$ 80.3

Acquisitions and Divestitures (

Acquisitions and Divestitures (Details) - Plains All American Pipeline, L.P. $ in Millions	1 Months Ended
	Apr. 30, 2020USD ($)TerminalsMMBbls
Business Acquisition [Line Items]
Consideration transferred | $	$ 162
NGL Storage Capacity | MMBbls	7
Liquid Petroleum Gas Terminals | Terminals	7

Certain Balance Sheet Informa_3

Certain Balance Sheet Information (Accrued Expenses and Other Liabilities) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Accrued Expenses and Other Liabilities [Line Items]
Accrued expenses	$ 50.9	$ 48.3
Accrued property taxes	6.3	8.4
Income tax payable	0.2	0.2
Interest payable	32.4	24.9
Accrued additions to property, plant and equipment	39.8	12.3
Operating leases	12	14.7
Finance leases	2.7	2.9
Deferred revenue	10.5	10.3
Total accrued expenses and other liabilities	154.8	122
Contract liabilities	179.2	172.2
Operating leases	23.3	28.5
Asset retirement obligations	35.1	34.1
Other long-term liabilities	254.9	253.3
Other
Accrued Expenses and Other Liabilities [Line Items]
Other long-term liabilities	17.3	18.5
Crestwood Midstream Partners LP
Accrued Expenses and Other Liabilities [Line Items]
Accrued expenses	49.4	46.4
Accrued property taxes	6.3	8.4
Income tax payable	0.2	0.2
Interest payable	32.4	24.9
Accrued additions to property, plant and equipment	39.8	12.3
Operating leases	12	14.7
Finance leases	2.7	2.9
Deferred revenue	10.5	10.3
Total accrued expenses and other liabilities	153.3	120.1
Contract liabilities	179.2	172.2
Operating leases	23.3	28.5
Asset retirement obligations	35.1	34.1
Other long-term liabilities	252.6	251.8
Crestwood Midstream Partners LP | Other
Accrued Expenses and Other Liabilities [Line Items]
Other long-term liabilities	$ 15	$ 17

Investments in Unconsolidated_3

Investments in Unconsolidated Affiliates (Net Investments In and Earnings (Loss) from Unconsolidated Affiliates) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Jul. 31, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Investment	$ 782.9		$ 782.9			$ 943.7
Earnings (loss) from unconsolidated affiliates, net	(27.1)	$ 8.4	(130.8)	$ 13.9
Stagecoach Gas Services LLC
Schedule of Equity Method Investments [Line Items]
Investment	628.2		628.2			792.5
Earnings (loss) from unconsolidated affiliates, net	(28)	9.2	(140.3)	18.4
Difference between carrying amount and underlying equity	$ 51.3		$ 51.3
Stagecoach Gas Services LLC | Con Edison Gas Pipeline and Storage Northeast, LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage	50.00%		50.00%
Stagecoach Gas Services LLC | Subsequent Event
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Transaction Costs					$ 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	$ 35.5		$ 155.4
Tres Palacios Holdings LLC
Schedule of Equity Method Investments [Line Items]
Investment	41		41			35.5
Earnings (loss) from unconsolidated affiliates, net	(0.1)	0.1	9.2	0.1
Difference between carrying amount and underlying equity	22.1		22.1
Powder River Basin Industrial Complex, LLC
Schedule of Equity Method Investments [Line Items]
Investment	3.6		3.6			3.6
Earnings (loss) from unconsolidated affiliates, net	$ 0	0.1	$ 0.1	(4.4)
Difference between carrying amount and underlying equity		5.5		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
Crestwood Permian Basin Holdings LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage	50.00%		50.00%
Investment	$ 110.1		$ 110.1			$ 112.1
Earnings (loss) from unconsolidated affiliates, net	1	$ (1)	0.2	$ (0.2)
Difference between carrying amount and underlying equity	$ 7.7		$ 7.7

Investments in Unconsolidated_4

Investments in Unconsolidated Affiliates (Summarized Financial Information) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Schedule of Equity Method Investments [Line Items]
Operating Revenues	$ 929.6	$ 352.7	$ 1,962.3	$ 1,080.6
Operating Expenses	107.1	125.9	219.2	315.8
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(38.1)	(24.3)	(76.4)	(47.7)
Tres Palacios Holdings LLC
Schedule of Equity Method Investments [Line Items]
Amortization	$ 0.3	$ 0.3	0.6	0.6
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule of Equity Method Investments [Line Items]
Operating Revenues			212.6	129.1
Operating Expenses			572.9	115
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest			(359.8)	15.2
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Stagecoach Gas Services LLC
Schedule of Equity Method Investments [Line Items]
Operating Revenues			77.5	75.6
Operating Expenses			454.9	38.9
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest			(377.4)	36.8
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Other Equity Method Investments
Schedule of Equity Method Investments [Line Items]
Operating Revenues			135.1	53.5
Operating Expenses			118	76.1
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest			$ 17.6	$ (21.6)

Investments in Unconsolidated_5

Investments in Unconsolidated Affiliates (Distributions and Contributions) (Details) - USD ($) $ in Millions	1 Months Ended	6 Months Ended
	Jul. 31, 2021	Jun. 30, 2021	Jun. 30, 2020
Schedule of Equity Method Investments [Line Items]
Proceeds from equity method investments		$ 43.2	$ 38.2
Payments to acquire equity method investments		10.2	6
Stagecoach Gas Services LLC
Schedule of Equity Method Investments [Line Items]
Proceeds from equity method investments		27	30
Payments to acquire equity method investments		0	0
Payment for Contingent Consideration Liability, Operating Activities		19
Crestwood Permian Basin Holdings LLC
Schedule of Equity Method Investments [Line Items]
Proceeds from equity method investments		5.5	6.7
Payments to acquire equity method investments		3.3	0
Tres Palacios Holdings LLC
Schedule of Equity Method Investments [Line Items]
Proceeds from equity method investments		10.6	1.4
Payments to acquire equity method investments		6.9	6
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
Subsequent Event | Stagecoach Gas Services LLC
Schedule of Equity Method Investments [Line Items]
Proceeds from equity method investments	$ 613.9
Payment for Contingent Consideration Liability, Operating Activities	40
Equity Method Investment, Transaction Costs	3
Subsequent Event | Crestwood Permian Basin Holdings LLC
Schedule of Equity Method Investments [Line Items]
Proceeds from equity method investments	3.4
Subsequent Event | Tres Palacios Holdings LLC
Schedule of Equity Method Investments [Line Items]
Proceeds from equity method investments	$ 2.5

Investments in Unconsolidated_6

Investments in Unconsolidated Affiliates (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	6 Months Ended
	Jul. 31, 2021	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Contingent consideration, current portion		$ 19		$ 19
Contingent consideration		19		38
Purchases of property, plant and equipment		21.3	$ 143.2
Interest Payable, Current		2.1
Crestwood Permian Basin Holdings LLC
Schedule of Equity Method Investments [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted		$ 10
Ownership percentage		50.00%
Stagecoach Gas Services LLC
Schedule of Equity Method Investments [Line Items]
Business Combination, Contingent Consideration, Liability		$ 38		57
Payment for Contingent Consideration Liability, Operating Activities		$ 19
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		19
Contingent consideration		19		$ 38
Purchases of property, plant and equipment		$ 21.3	$ 143.2
Subsequent Event | Stagecoach Gas Services LLC
Schedule of Equity Method Investments [Line Items]
Payment for Contingent Consideration Liability, Operating Activities	$ 40

Risk Management (Risk Managemen

Risk Management (Risk Management Activities) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Product revenues	$ 52.7	$ 18	$ 167.5	$ 93
Commodity contract
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments not designated as hedging	$ (33.3)	$ (6.8)	$ (41.4)	$ 15.2

Risk Management (Notional Amoun

Risk Management (Notional Amounts and Terms of Company's Derivative Financial Instruments) (Details) bcf in Millions, MMBbls in Millions	Jun. 30, 2021MMBblsbcf	Dec. 31, 2020bcfMMBbls
Propane, ethane, butane, heating oil and crude oil (MMBbls) | Fixed Price Payor
Derivative [Line Items]
Derivative, notional amount | MMBbls	66.3	72.7
Propane, ethane, butane, heating oil and crude oil (MMBbls) | Fixed Price Receiver
Derivative [Line Items]
Derivative, notional amount | MMBbls	70.6	76.5
Natural gas (Bcf) | Fixed Price Payor
Derivative [Line Items]
Derivative, notional amount | bcf	26.1	22.6
Natural gas (Bcf) | Fixed Price Receiver
Derivative [Line Items]
Derivative, notional amount | bcf	33.6	28.6

Risk Management (Schedule of De

Risk Management (Schedule of Derivative Instruments in Statement of Financial Position, Fair Value) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Derivative [Line Items]
Collateral posted for commodity derivative instruments	$ 8.5	$ 12.4
Commodity contract
Derivative [Line Items]
Collateral posted for commodity derivative instruments	0.1	0.1
Commodity contract with credit contingent features
Derivative [Line Items]
Aggregate fair value of commodity derivative instruments	83.7	38.5
Variation Margin-Related Net Derivative Asset Position
Derivative [Line Items]
Derivative Asset	124.7	35.9
Variation Margin-Related Cash Collateral Received
Derivative [Line Items]
NYMEX margin deposits	$ 99.5	$ 18.3

Risk Management (Narrative) (De

Risk Management (Narrative) (Details) - Price Risk Contracts Member - Maximum	6 Months Ended
	Jun. 30, 2021
Derivative [Line Items]
Remaining maturity	38 months
Percent of contracts expiring in the next twelve months	85.00%

Fair Value Measurements (Assets

Fair Value Measurements (Assets And Liabilities Measured At Fair Value On Recurring Basis) (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets from price risk management	$ 1,000.7	$ 500.7
SPH units	2.2	2.1
Assets, Fair Value Disclosure, Excluding Netting Adjustments	1,002.9	502.8
Netting agreements	(873.3)	(455)
Assets, Collateral/Margin Received or Paid	(99.8)	(18.5)
Assets from price risk management, total	27.6	27.2
Total assets at fair value	29.8	29.3
Liabilities from price risk management	1,015.2	519.1
Liabilities, Fair Value Disclosure, Excluding Netting Adjustments	1,015.2	519.1
Netting agreements	(873.3)	(455)
Liabilities, Collateral/Margin Received or Paid	8.2	12.2
Liabilities from price risk management, total	150.1	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	52.4	20.2
SPH units	2.2	2.1
Assets, Fair Value Disclosure, Excluding Netting Adjustments	54.6	22.3
Liabilities from price risk management	41.2	25.1
Liabilities, Fair Value Disclosure, Excluding Netting Adjustments	41.2	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	948.3	480.5
SPH units	0	0
Assets, Fair Value Disclosure, Excluding Netting Adjustments	948.3	480.5
Liabilities from price risk management	974	494
Liabilities, Fair Value Disclosure, Excluding Netting Adjustments	974	494
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
SPH units	0	0
Assets, Fair Value Disclosure, Excluding Netting Adjustments	0	0
Liabilities from price risk management	0	0
Liabilities, Fair Value Disclosure, Excluding Netting Adjustments	$ 0	$ 0

Fair Value Measurements (Schedu

Fair Value Measurements (Schedule of Carrying Values and Estimated Fair Values of Senior Notes) (Details) - Crestwood Midstream Partners LP - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
2023 Senior Notes
Debt Instrument [Line Items]
Carrying Amount	$ 0	$ 683.8
Fair Value	0	691.5
2025 Senior Notes
Debt Instrument [Line Items]
Carrying Amount	496	495.5
Fair Value	514.7	509.9
2027 Senior Notes
Debt Instrument [Line Items]
Carrying Amount	593.7	593.2
Fair Value	617.7	594.1
Senior Notes, 2029
Debt Instrument [Line Items]
Carrying Amount	690.2	0
Fair Value	$ 733.6	$ 0

Long-Term Debt (Components Of L

Long-Term Debt (Components Of Long-Term Debt) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Less: deferred financing costs, net	$ 27.2	$ 22.6
Total debt	2,621.8	2,484
Less: current portion	0.2	0.2
Total long-term debt, less current portion	2,621.6	2,483.8
Senior Notes | 2023 Senior Notes
Debt Instrument [Line Items]
Senior notes	0	687.2
Senior Notes | 2025 Senior Notes
Debt Instrument [Line Items]
Senior notes	500	500
Senior Notes | 2027 Senior Notes
Debt Instrument [Line Items]
Senior notes	600	600
Senior Notes | Senior Notes, 2029
Debt Instrument [Line Items]
Senior notes	700	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	$ 848.6	$ 719

Long-Term Debt (Narrative) (Det

Long-Term Debt (Narrative) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2021USD ($)	Jun. 30, 2020USD ($)	Jun. 30, 2021USD ($)	Jun. 30, 2020USD ($)	Jan. 31, 2021USD ($)	Dec. 31, 2020USD ($)
Debt Instrument [Line Items]
Senior Secured Leverage Ratio, maximum	3.75		3.75
Senior Secured Leverage Ratio	1.33		1.33
Extinguishment of Debt, Amount			$ 687,200,000
Loss on modification/extinguishment of debt	$ 1,200,000	$ 0	6,700,000	$ 0
Interest Paid, Including Capitalized Interest, Operating and Investing Activities			8,600,000
Crestwood Midstream Partners LP
Debt Instrument [Line Items]
Loss on modification/extinguishment of debt	1,200,000	$ 0	6,700,000	$ 0
2027 Senior Notes | Crestwood Midstream Partners LP
Debt Instrument [Line Items]
Senior notes	593,700,000		593,700,000			$ 593,200,000
2025 Senior Notes | Crestwood Midstream Partners LP
Debt Instrument [Line Items]
Senior notes	496,000,000		$ 496,000,000			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	366,700,000		$ 366,700,000
Letters of credit outstanding	$ 34,700,000		$ 34,700,000			$ 23,900,000
Debt, Weighted Average Interest Rate	2.38%		2.38%			2.45%
Interest Coverage Ratio Minimum			2.50
Total Funded Debt to Consolidated Ebitda			4.16
Consolidated Ebitda To Consolidated Interest Expense			4.84
Crestwood Midstream Revolver | Revolving Credit Facility | Minimum
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	2.33%		2.33%			2.40%
Crestwood Midstream Revolver | Revolving Credit Facility | Maximum
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	4.50%		4.50%			4.50%
2023 Senior Notes | Crestwood Midstream Partners LP
Debt Instrument [Line Items]
Senior notes	$ 0		$ 0			$ 683,800,000
Senior Notes | 2027 Senior Notes
Debt Instrument [Line Items]
Senior notes	600,000,000		600,000,000			600,000,000
Senior Notes | 2025 Senior Notes
Debt Instrument [Line Items]
Senior notes	500,000,000		500,000,000			500,000,000
Senior Notes | 2023 Senior Notes
Debt Instrument [Line Items]
Senior notes	0		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
Revolving Loan Facility | Crestwood Midstream Partners LP
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,250,000,000		$ 1,250,000,000
Debt Instrument, Term			5 years

Commitments and Contingencies_2

Commitments and Contingencies (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Damages	$ 55
Accrued amounts for outstanding legal matters	36.3	$ 10.4
Crestwood Midstream Partners LP
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Self-insurance reserves	5.7	$ 6.7
Self-insurance reserves expected to be paid	$ 4.1

Commitments and Contingencies_3

Commitments and Contingencies (Environmental Compliance) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 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	1.9
Minimum | Fort Berthold Indian Reservation
Site Contingency [Line Items]
Potential liability for environmental exposures	$ 1.3

Commitments and Contingencies_4

Commitments and Contingencies (Self Insurance) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Crestwood Equity Partners LP
Other Commitments [Line Items]
Self-insurance reserves	$ 6.6	$ 7.7
Self-insurance reserves expected to be paid	4.8
Crestwood Midstream Partners LP
Other Commitments [Line Items]
Self-insurance reserves	5.7	$ 6.7
Self-insurance reserves expected to be paid	$ 4.1

Leases (Details)

Leases (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets, net	$ 29.6		$ 29.6		$ 36.8
Operating leases	12		12		14.7
Operating leases	23.3		23.3		28.5
Total operating lease liabilities	35.3		35.3		43.2
Property, plant and equipment	3,805.2		3,805.2		3,759.6
Less: accumulated depreciation	927.1		927.1		842.5
Property, plant and equipment, net	2,878.1		2,878.1		2,917.1
Finance leases	2.7		2.7		2.9
Finance Lease, Liability, Noncurrent	0.7		0.7		1.9
Finance Lease, Liability	3.4		3.4		$ 4.8
Operating lease expense	4.3	$ 7.1	9.1	$ 14.6
Finance lease expense	$ 0.9	$ 1.1	$ 1.8	$ 2.2
Operating lease, liability, current, extensible enumeration	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent		us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent		us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent
Finance lease, liability, noncurrent, extensible enumeration	Other long-term liabilities		Other long-term liabilities		Other long-term liabilities
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent		us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent		us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent
Operating lease, liability, noncurrent, extensible enumeration	Other long-term liabilities		Other long-term liabilities		Other long-term liabilities
Finance Leases
Lessee, Lease, Description [Line Items]
Property, plant and equipment	$ 12.8		$ 12.8		$ 13.3
Less: accumulated depreciation	9		9		7.9
Property, plant and equipment, net	$ 3.8		$ 3.8		$ 5.4

Partners' Capital (Schedule of

Partners' Capital (Schedule of Partners' Capital Account, Distributions) (Details) - USD ($) $ / shares in Units, $ in Millions	May 14, 2021	May 07, 2021	Feb. 12, 2021	Feb. 05, 2021	May 15, 2020	May 08, 2020	Feb. 14, 2020	Feb. 07, 2020	Jun. 30, 2021	Jun. 30, 2020
Distribution Made to Limited Partner [Line Items]
Distribution Made to Limited Partner, Date of Record		May 7, 2021		Feb. 5, 2021		May 8, 2020		Feb. 7, 2020
Distribution Made to Limited Partner, Distribution Date	May 14, 2021		Feb. 12, 2021		May 15, 2020		Feb. 14, 2020
Distribution Made to Member or Limited Partner, Distributions Paid, Per Unit	$ 0.625		$ 0.625		$ 0.625		$ 0.625
Distribution Made to Limited Partner, Cash Distributions Paid	$ 39.3		$ 46.4		$ 45.7		$ 45.3		$ 85.7	$ 91

Partners' Capital (Components o

Partners' Capital (Components of Net Income (Loss) Attributable to Non-Controlling Interests) (Details) $ in Millions	1 Months Ended
	Jul. 31, 2021USD ($)
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) (

Partners' Capital (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions

Aug. 13, 2021

Aug. 06, 2021

Jul. 15, 2021

May 14, 2021

May 07, 2021

Feb. 12, 2021

Feb. 05, 2021

May 15, 2020

May 08, 2020

Feb. 14, 2020

Feb. 07, 2020

Mar. 31, 2021

Feb. 28, 2021

Jun. 30, 2021

Jun. 30, 2021

Jun. 30, 2020

Distribution Made to Limited Partner [Line Items]

Distribution Made to Limited Partner, Distribution Date

May 14, 2021

Feb. 12, 2021

May 15, 2020

Feb. 14, 2020

Distribution Made to Limited Partner, Date of Record

May 7, 2021

Feb. 5, 2021

May 8, 2020

Feb. 7, 2020

Distributions to preferred unitholders

$ 30

$ 30

Incentive Distribution, Distribution

85.7

91

Distributions to non-controlling partner

19.6

18.5

Distribution Made to Limited Partner, Cash Distributions Paid

$ 39.3

$ 46.4

$ 45.7

$ 45.3

85.7

91

Cash Paid to Repurchase Common Stock

$ 268

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

395.4

119

Distributions to non-controlling partner

19.6

18.5

Distribution Made to General Partner, Cash Distributions Paid

395.4

$ 119

Common unit

Distribution Made to Limited Partner [Line Items]

Transaction Costs

$ 7.6

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

$ 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

Aug. 13, 2021

Distribution Made to Limited Partner, Date of Record

Aug. 6, 2021

Distributions to preferred unitholders

$ 15

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

$ 1

Partners' Capital Rollforward o

Partners' Capital Rollforward of non-controlling interest (Details) - USD ($) $ in Millions	1 Months Ended	6 Months Ended
	Jul. 31, 2021	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Increase (Decrease) in Temporary Equity [Roll Forward]
Temporary Equity, Net Income		$ 20.4	$ 20.1
Interest of non-controlling partner in subsidiary		433.5	430.6	$ 432.7	$ 426.2
Net proceeds from issuance of non-controlling interest		0	2.8
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		$ (19.6)	(18.5)
Net proceeds from issuance of non-controlling interest			$ 2.8

Earnings Per Limited Partner _3

Earnings Per Limited Partner Unit (Details) - shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 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	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	0.2	0.1	0.3
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	0.4	0.2	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	3.6	8.2	3.6	8.2

Segments (Reconciliation of Net

Segments (Reconciliation of Net Income (Loss) to EBITDA) (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021USD ($)	Jun. 30, 2020USD ($)	Jun. 30, 2021USD ($)segment	Jun. 30, 2020USD ($)
Segment Reporting, Other Significant Reconciling Item [Line Items]
Number of Operating Segments | segment			3
Net loss	$ (38.1)	$ (24.3)	$ (76.4)	$ (47.7)
Interest and debt expense, net	35.1	34	71.1	66.6
Provision (benefit) for income taxes	0.1	(0.1)	0	(0.1)
Depreciation, amortization and accretion	58.8	61	118	117.1
EBITDA	57.1	70.6	119.4	135.9
Loss on modification/extinguishment of debt	1.2	0	6.7	0
Crestwood Midstream Partners LP
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net loss	(38.5)	(26.8)	(78.9)	(52.4)
Interest and debt expense, net	35.1	34	71.1	66.6
Provision (benefit) for income taxes	0.1	(0.2)	0	(0.2)
Depreciation, amortization and accretion	62.2	64.6	125	124.2
EBITDA	60.1	71.6	123.9	138.2
Loss on modification/extinguishment of debt	$ 1.2	$ 0	$ 6.7	$ 0

Segments (Summary Of Segment In

Segments (Summary Of Segment Information) (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021USD ($)	Jun. 30, 2020USD ($)	Jun. 30, 2021USD ($)segment	Jun. 30, 2020USD ($)	Dec. 31, 2020USD ($)
Net loss	$ (38.1)	$ (24.3)	$ (76.4)	$ (47.7)
Number of Operating Segments | segment			3
Depreciation, amortization and accretion	58.8	61	$ 118	117.1
Segment Reporting Information, Additional Information [Abstract]
Revenues	929.6	352.7	1,962.3	1,080.6
Costs of product/services sold	797.2	225.7	1,611	760.1
Operations and maintenance	25.8	31.6	58.6	69.2
General and administrative	22.8	29.5	41.5	44.4
Gain (loss) on long-lived assets	0.3	(3.8)	(1.1)	(4.8)
Goodwill impairment	0	0	0	(80.3)
Earnings (loss) from unconsolidated affiliates, net	(27.1)	8.4	(130.8)	13.9
Other income, net	0.1	0.1	0.1	0.2
EBITDA	57.1	70.6	119.4	135.9
Assets	5,130.2		5,130.2		$ 5,243.7
Corporate, Non-Segment
Segment Reporting Information, Additional Information [Abstract]
Assets	28.4		28.4		29.5
Intersegment Eliminations
Segment Reporting Information, Additional Information [Abstract]
Revenues	(87.3)	(16.7)	(195)	(59.3)
Gathering and Processing Segment | Operating Segments
Segment Reporting Information, Additional Information [Abstract]
Assets	3,402.2		3,402.2		3,464.6
Marketing Supply and Logistics
Segment Reporting Information, Additional Information [Abstract]
Revenues				744.6
Storage And Transportation Operations | Operating Segments
Segment Reporting Information, Additional Information [Abstract]
Assets	781.4		781.4		944.6
Marketing Supply and Logistics | Operating Segments
Segment Reporting Information, Additional Information [Abstract]
Assets	918.2		918.2		805
Crestwood Midstream Partners LP
Net loss	(38.5)	(26.8)	(78.9)	(52.4)
Depreciation, amortization and accretion	62.2	64.6	125	124.2
Segment Reporting Information, Additional Information [Abstract]
Revenues	929.6	352.7	1,962.3	1,080.6
Costs of product/services sold	797.2	225.7	1,611	760.1
Operations and maintenance	25.8	31.6	58.6	69.2
General and administrative	19.7	28.4	36.9	41.9
Gain (loss) on long-lived assets	0.3	(3.8)	(1.1)	(4.8)
Goodwill impairment	0	0	0	(80.3)
Earnings (loss) from unconsolidated affiliates, net	(27.1)	8.4	(130.8)	13.9
EBITDA	60.1	71.6	123.9	138.2
Assets	5,264.4		5,264.4		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	19.7	28.4	36.9	41.9
Gain (loss) on long-lived assets	0	0	0	0
Goodwill impairment				0
Earnings (loss) from unconsolidated affiliates, net	0	0	0	0
EBITDA	(19.7)	(28.4)	(36.9)	(41.9)
Assets	24.6		24.6		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	173.3	114.5	327.7	329.4
Costs of product/services sold	120.6	21.3	237.1	129.6
Operations and maintenance	14.7	19.3	36.1	46.3
General and administrative	0	0	0	0
Gain (loss) on long-lived assets	0.3	(3.6)	(1.2)	(4.6)
Goodwill impairment				(80.3)
Earnings (loss) from unconsolidated affiliates, net	1	(1)	0.2	(0.2)
EBITDA	123.5	83.6	243	122.7
Assets	3,540.2		3,540.2		3,609.7
Crestwood Midstream Partners LP | Gathering and Processing Segment | Intersegment Eliminations
Segment Reporting Information, Additional Information [Abstract]
Revenues	84.2	14.3	189.5	54.3
Crestwood Midstream Partners LP | Storage and Transportation | Operating Segments
Segment Reporting Information, Additional Information [Abstract]
Revenues	2	3.1	4	6.6
Costs of product/services sold	(0.4)	0.1	0	0.3
Operations and maintenance	1	0.7	1.6	2.1
General and administrative	0	0	0	0
Gain (loss) on long-lived assets	0	0	0	0
Earnings (loss) from unconsolidated affiliates, net	(28.1)	9.4	(131)	14.1
EBITDA	(23.6)	14.1	(123.1)	23.3
Assets	781.4		781.4		944.6
Crestwood Midstream Partners LP | Storage and Transportation | Intersegment Eliminations
Segment Reporting Information, Additional Information [Abstract]
Revenues	3.1	2.4	5.5	5
Crestwood Midstream Partners LP | Marketing Supply and Logistics | Operating Segments
Segment Reporting Information, Additional Information [Abstract]
Revenues	754.3	235.1	1,630.6	744.6
Costs of product/services sold	677	204.3	1,373.9	630.2
Operations and maintenance	10.1	11.6	20.9	20.8
General and administrative	0	0	0	0
Gain (loss) on long-lived assets	0	(0.2)	0.1	(0.2)
Earnings (loss) from unconsolidated affiliates, net	0	0	0	0
EBITDA	(20.1)	2.3	40.9	34.1
Assets	918.2		918.2		805
Crestwood Midstream Partners LP | Marketing Supply and Logistics | Intersegment Eliminations
Segment Reporting Information, Additional Information [Abstract]
Revenues	(87.3)	(16.7)	(195)	(59.3)
Crestwood Midstream Partners LP | Storage And Transportation Operations | Operating Segments
Segment Reporting Information, Additional Information [Abstract]
Goodwill impairment				0
Crestwood Midstream Partners LP | Marketing Supply and Logistics | Operating Segments
Segment Reporting Information, Additional Information [Abstract]
Goodwill impairment				0
Crestwood Equity Partners LP
Segment Reporting Information, Additional Information [Abstract]
General and administrative	3.1	1.1	4.6	2.5
Other income, net	0.1	0.1	0.1	0.2
Assets	5,130.2		5,130.2		$ 5,243.7
Earnings (Losses) Before Interest, Taxes, Depreciation and Amortization	57.1	70.6	119.4	135.9
Crestwood Equity Partners LP | Corporate, Non-Segment
Segment Reporting Information, Additional Information [Abstract]
General and administrative	3.1	1.1	4.6	2.5
Other income, net	0.1	0.1	0.1	0.2
Earnings (Losses) Before Interest, Taxes, Depreciation and Amortization	(22.7)	(29.4)	(41.4)	(44.2)
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	0	0
Earnings (Losses) Before Interest, Taxes, Depreciation and Amortization	123.5	83.6	243	122.7
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	0	0
Earnings (Losses) Before Interest, Taxes, Depreciation and Amortization	(23.6)	14.1	(123.1)	23.3
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	0	0
Earnings (Losses) Before Interest, Taxes, Depreciation and Amortization	$ (20.1)	$ 2.3	$ 40.9	$ 34.1

Segments (Narrative) (Details)

Segments (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Interest, taxes, depreciation and amortization included in earnings from equity method investments	$ 48.1	$ 9.5	$ 177.5	$ 23.3

Revenues (Narrative) (Details)

Revenues (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Revenue Recognition [Abstract]
ASC 606 accounts receivable	$ 298.4	$ 219.9

Revenues (Contract Assets and L

Revenues (Contract Assets and Liabilities) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Revenue Recognition [Abstract]
Contract Assets (Non-current)	$ 1.5	$ 1.5	$ 1
Contract Liabilities (Current)	10.5	10.5	10.3
Contract liabilities	179.2	179.2	$ 172.2
Contract with Customer, Liability, Revenue Recognized	$ 3.3	$ 6.4

Revenues (Disaggregation of Rev

Revenues (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Revenues	$ 929.6	$ 352.7	$ 1,962.3	$ 1,080.6
Gathering and Processing Operations
Disaggregation of Revenue [Line Items]
Revenue including intersegment eliminations	257.5	128.8	517.2	383.7
Storage and Transportation
Disaggregation of Revenue [Line Items]
Revenue including intersegment eliminations	5.1	5.5	9.5	11.6
Marketing Supply and Logistics
Disaggregation of Revenue [Line Items]
Revenues				744.6
Revenue including intersegment eliminations	754.3	235.1	1,630.6
Natural Gas Gathering
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	33.3	33.2	64.7	77
Natural Gas Gathering | Gathering and Processing Operations
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	33.3	33.2	64.7	77
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	18.4	17.9	39.1	44.4
Crude Oil Gathering | Gathering and Processing Operations
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	18.4	17.9	39.1	44.4
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	22.7	18.3	44.7	41.3
Water Gathering | Gathering and Processing Operations
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	22.7	18.3	44.7	41.3
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	7.3	7.1	14.3	17.3
Natural Gas Processing | Gathering and Processing Operations
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	7.3	7.1	14.3	17.3
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	3.7	5.7	8.4	12
Natural Gas Compression | Gathering and Processing Operations
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	3.7	5.7	8.4	12
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	0.1	0.7	0.3	1.4
Crude Oil Storage | Gathering and Processing Operations
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.1	0.4	0.2	0.9
Crude Oil Storage | Storage and Transportation
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.9	1.1	1.5	1.7
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	2.4	3.6	6.1	5.2
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	2.4	3.6	6.1	5.2
Crude Oil Pipeline
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.6	0.9	1.4	2
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	1.7	1.3	3	2.9
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	0.4	1.8	1.1	5.4
Crude Oil Transportation | Gathering and Processing Operations
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.4	1.5	1.1	3.5
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	0.3	0	1.9
NGL Transportation
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	4.2	2.6	8.4	4.3
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	2.6	8.4	4.3
Crude Oil Rail Loading
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1.2	1.7	2.2	3.7
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	2.9	4.6	6.3
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	44.3	15.6	140.5	34.2
Natural Gas Product Sales | Gathering and Processing Operations
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	26.8	6.9	69.6	18.9
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	44.3	15.5	139.9	33.8
Crude Oil Product Sales
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	431.4	129.7	749.9	484.7
Crude Oil Product Sales | Gathering and Processing Operations
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	101.7	34.8	191.7	155.9
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	344.4	102	595.6	352.2
NGL Product Sales
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	305.1	95.1	711.1	253
NGL Product Sales | Gathering and Processing Operations
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	42.9	3	83.2	12.5
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	304.8	92.4	710.8	252.7
Other revenue
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.7	0.3	0.9	0.9
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	0.2	0.4	0.7
Other revenue | Marketing Supply and Logistics
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.6	0.2	0.8	0.7
NGL Pipeline
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.1	0.2	0.1	0.2
NGL Pipeline | Gathering and Processing Operations
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0	0	0	0
NGL Pipeline | Storage and Transportation
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0	0	0	0
NGL Pipeline | Marketing Supply and Logistics
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.1	0.2	0.1	0.2
Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Revenues	(87.3)	(16.7)	(195)	(59.3)
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	(0.9)	(0.8)	(1.4)	(1.2)
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	(1.1)	(0.4)	(1.6)	(0.9)
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	(1.1)	(1.2)	(2.4)	(2.6)
Intersegment Eliminations | Natural Gas Product Sales
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	(26.8)	(6.8)	(69)	(18.5)
Intersegment Eliminations | Crude Oil Product Sales
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	(14.7)	(7.1)	(37.4)	(23.4)
Intersegment Eliminations | NGL Product Sales
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	(42.6)	(0.3)	(82.9)	(12.2)
Intersegment Eliminations | Other revenue
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	(0.1)	(0.1)	(0.3)	(0.5)
Intersegment Eliminations | NGL Pipeline
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0	0	0	0
Revenue from Contract with Customer
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	875.9	334.4	1,793.2	987
Revenue from Contract with Customer | Gathering and Processing Operations
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	257.3	128.8	517	383.7
Revenue from Contract with Customer | Storage and Transportation
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	5.1	5.5	9.5	11.6
Revenue from Contract with Customer | Marketing Supply and Logistics
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	700.8	216.8	1,461.7	651
Revenue from Contract with Customer | Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	(87.3)	(16.7)	(195)	(59.3)
Product and Service, Other
Disaggregation of Revenue [Line Items]
Non-Topic 606 revenues	53.7	18.3	169.1	93.6
Product and Service, Other | Gathering and Processing Operations
Disaggregation of Revenue [Line Items]
Non-Topic 606 revenues	0.2	0	0.2	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	53.5	18.3	168.9	93.6
Product and Service, Other | Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Non-Topic 606 revenues	$ 0	$ 0	$ 0	$ 0

Revenues (Remaining Performance

Revenues (Remaining Performance Obligations) (Details) $ in Millions	Jun. 30, 2021USD ($)
Revenue Recognition [Abstract]
Revenue, Remaining Performance Obligation, Amount	$ 206.8
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01
Revenue Recognition [Abstract]
Revenue, Remaining Performance Obligation, Amount	$ 46.5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue Recognition [Abstract]
Revenue, Remaining Performance Obligation, Amount	$ 76
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	$ 52.6
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	$ 31.7
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]: 2025-01-01
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 (Det

Related Party Transactions (Details) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Related Party Transaction [Line Items]
Purchases of property, plant and equipment				$ 21,300,000	$ 143,200,000
Costs of product/services sold at CEQP and CMLP(2)	$ 25,400,000		$ 3,600,000	66,500,000	6,800,000
Operations and maintenance expenses charged by CEQP and CMLP	6,000,000		5,500,000	11,700,000	11,700,000
Related Party Transaction, Due from (to) Related Party [Abstract]
Noncash Distribution to Parent [Line Items]		$ 2,400,000
Tres Palacios Holdings LLC
Related Party Transaction [Line Items]
Costs of product/services sold at CEQP and CMLP(2)	300,000		100,000	11,100,000	100,000
Applied Consultants, Inc.
Related Party Transaction [Line Items]
Purchases of property, plant and equipment				500,000	2,900,000
Crestwood Permian Basin Holdings LLC
Related Party Transaction [Line Items]
Costs of product/services sold at CEQP and CMLP(2)	14,800,000		3,200,000	45,100,000	6,400,000
Affiliated Entity
Related Party Transaction [Line Items]
Revenues at CEQP and CMLP	13,200,000		7,500,000	18,100,000	15,000,000
Costs of product/services sold at CEQP and CMLP(2)	25,400,000		3,600,000	66,500,000	6,800,000
General and administrative expenses charged by CEQP to CMLP, net	6,600,000		10,900,000	12,500,000	18,000,000
Related Party Transaction, Due from (to) Related Party [Abstract]
Related party receivables	7,000,000			7,000,000		$ 2,500,000
Related party payables	11,300,000			11,300,000		7,500,000
Ascent Resources - Utica, LLC
Related Party Transaction [Line Items]
Costs of product/services sold at CEQP and CMLP(2)	10,300,000		300,000	10,300,000	300,000
Crestwood Equity Partners LP | Affiliated Entity
Related Party Transaction [Line Items]
General and administrative expenses charged by CEQP to CMLP, net			200,000	200,000	400,000
Related Party Transaction Selling General And Administrative Expenses To (From) Transactions With Related Party	0		(1,500,000)	4,800,000	11,300,000
Crestwood Midstream Partners LP
Related Party Transaction [Line Items]
Purchases of property, plant and equipment				21,300,000	143,200,000
Revenues at CEQP and CMLP	400,000		100,000	400,000	300,000
Costs of product/services sold at CEQP and CMLP(2)	25,400,000		3,600,000	66,500,000	6,800,000
Crestwood Midstream Partners LP | Affiliated Entity
Related Party Transaction [Line Items]
General and administrative expenses charged by CEQP to CMLP, net	1,000,000		1,000,000	2,000,000	2,100,000
Related Party Transaction, Due from (to) Related Party [Abstract]
Related party payables	11,300,000			11,300,000		$ 5,000,000
Crestwood LTIP | Crestwood Midstream Partners LP
Related Party Transaction [Line Items]
Share-based Payment Arrangement, Expense	7,600,000		11,900,000	14,500,000	20,100,000
Crestwood LTIP | Crestwood Holdings
Related Party Transaction [Line Items]
Share-based Payment Arrangement, Expense	0		1,700,000	4,600,000	10,900,000
Stagecoach Gas Services LLC
Related Party Transaction [Line Items]
Operations and maintenance expenses charged by CEQP and CMLP	1,600,000		1,600,000	3,300,000	3,300,000
Tres Palacios Holdings LLC
Related Party Transaction [Line Items]
Operations and maintenance expenses charged by CEQP and CMLP	1,200,000		1,100,000	2,400,000	2,200,000
Related Party Transaction, Due from (to) Related Party [Abstract]
Amortization	300,000		300,000	600,000	600,000
Crestwood Permian Basin Holdings LLC
Related Party Transaction [Line Items]
Operations and maintenance expenses charged by CEQP and CMLP	$ 3,200,000		$ 2,800,000	$ 6,000,000	$ 6,200,000