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Partners' Capital (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions																											1 Months Ended			12 Months Ended
	Feb. 14, 2019	Feb. 07, 2019	Nov. 14, 2018	Nov. 07, 2018	Aug. 14, 2018	Aug. 07, 2018	May 15, 2018	May 08, 2018	Feb. 14, 2018	Feb. 07, 2018	Nov. 14, 2017	Nov. 07, 2017	Aug. 14, 2017	Aug. 07, 2017	May 15, 2017	May 08, 2017	Feb. 14, 2017	Feb. 07, 2017	Nov. 14, 2016	Nov. 07, 2016	Aug. 12, 2016	Aug. 05, 2016	May 13, 2016	May 06, 2016	Feb. 12, 2016	Feb. 05, 2016	Jan. 31, 2019	Dec. 31, 2017	Nov. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Mar. 31, 2018
Distribution Made to Member or Limited Partner [Line Items]
Distribution to limited partner, distribution date			Nov. 14, 2018		Aug. 14, 2018		May 15, 2018		Feb. 14, 2018		Nov. 14, 2017		Aug. 14, 2017		May 15, 2017		Feb. 14, 2017		Nov. 14, 2016		Aug. 12, 2016		May 13, 2016		Feb. 12, 2016
Maximum Period For Distribution Of Available Cash																														45 days
Per unit rate, in dollars per unit			$ 0.60		$ 0.60		$ 0.60		$ 0.6		$ 0.60		$ 0.60		$ 0.60		$ 0.60		$ 0.60		$ 0.60		$ 0.60		$ 1.3750
Distributions to partners																														$ (170.8)	$ (167.6)	$ (219.8)
Payments to Acquire Equity Method Investments																														64.4	58.0	12.4
Loss on contingent consideration																														0.0	$ (57.0)	$ 0.0
Distribution made to limited partners																															4,724,030	5,815,170
Distributions paid to non-controlling partners																														$ 9.9	$ 15.2	$ 15.2
Limited partners' units, issued																												70,721,563		71,659,385	70,721,563
Dividends, Paid-in-kind																														$ 43.1	$ 53.0
Issuance of preferred equity of subsidiary																															$ 0.0
Preferred units, outstanding																												71,257,445		71,257,445	71,257,445		71,257,445
Preferred units, issued																												71,257,445		71,257,445	71,257,445
Equity Offering Program Authorized Amount																														$ 250.0
Equity Distribution Program Management Fee Percentage																														2.00%
Payments of Stock Issuance Costs																															$ 0.3
Partners' Capital Account, Units, Sold in Public Offering																														0	633,271
Proceeds from Issuance or Sale of Equity																															$ 15.2
Distributions to preferred unitholders																													$ 15.0	$ 60.1	15.0	0.0
Distribution to limited partner, record date				Nov. 07, 2018		Aug. 07, 2018		May 08, 2018		Feb. 07, 2018		Nov. 07, 2017		Aug. 07, 2017		May 08, 2017		Feb. 07, 2017		Nov. 07, 2016		Aug. 05, 2016		May 06, 2016		Feb. 05, 2016
Payments for Repurchase of Redeemable Noncontrolling Interest																												$ 202.7		0.0	202.7	0.0
Proceeds from Noncontrolling Interests																												$ 175.0		$ 0.0	175.0	0.0
Preferred Units, Class A
Distribution Made to Member or Limited Partner [Line Items]
Partners' Capital Account, Private Placement of Units, Price Per Unit																														$ 9.13
Subsequent Event
Distribution Made to Member or Limited Partner [Line Items]
Distributions to preferred unitholders	$ 15.0
Crestwood Equity Partners LP
Distribution Made to Member or Limited Partner [Line Items]
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest																														99.90%
Crestwood Niobrara LLC \| Cash distribution
Distribution Made to Member or Limited Partner [Line Items]
Distributions paid to non-controlling partners																														$ 9.9	15.2	15.2
Crestwood Niobrara LLC \| Subsequent Event \| Cash distribution
Distribution Made to Member or Limited Partner [Line Items]
Distributions paid to non-controlling partners																											$ 3.3
Crestwood Gas Services GP, LLC
Distribution Made to Member or Limited Partner [Line Items]
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest																														0.10%
CMLP
Distribution Made to Member or Limited Partner [Line Items]
Distributions to partners																														$ (238.4)	(174.0)	(227.6)
Payments to Acquire Equity Method Investments																														64.4	58.0	12.4
Loss on contingent consideration																														0.0	(57.0)	0.0
Distributions paid to non-controlling partners																														9.9	15.2	15.2
Issuance of preferred equity of subsidiary																															175.0
Distribution Made to General Partner, Cash Distributions Paid																														238.4	174.0	227.6
Payments for Repurchase of Redeemable Noncontrolling Interest																														0.0	202.7	0.0
Proceeds from Noncontrolling Interests																														0.0	175.0	0.0
Tres Palacios Holdings LLC
Distribution Made to Member or Limited Partner [Line Items]
Payments to Acquire Equity Method Investments																														$ 2.5	5.6	11.0
Equity method ownership percentage																														50.01%
Tres Palacios Holdings LLC \| CMLP
Distribution Made to Member or Limited Partner [Line Items]
Equity method ownership percentage																														50.01%
Jackalope Gas Gathering Services, LLC
Distribution Made to Member or Limited Partner [Line Items]
Equity method ownership percentage																														50.00%
Jackalope Gas Gathering Services, LLC \| Crestwood Niobrara LLC
Distribution Made to Member or Limited Partner [Line Items]
Payments to Acquire Equity Method Investments																														$ 49.1	3.5	$ 1.4
Cash distribution \| Subsequent Event
Distribution Made to Member or Limited Partner [Line Items]
Distribution to limited partner, distribution date	Feb. 14, 2019
Distribution declared per limited partner unit	$ 0.600
Distribution to limited partner, record date		Feb. 07, 2019
Preferred Partner
Distribution Made to Member or Limited Partner [Line Items]
Partners' Capital, Distribution Amount Per Share																														$ 0.2567
Partners' Capital, Contingent Distribution Amount Per Share																														$ 0.2111
Partner's Capital, Unpaid Distribution, Accrual Percentage																														2.8125%
Subordinated Unit \| Limited Partners
Distribution Made to Member or Limited Partner [Line Items]
Limited partners' units, issued																																438,789
Partners' Capital Account, Units, Cash Distribution Threshold, Quarterly Distribution																														$ 1.30
Partners' Capital Account, Units, Conversion Threshold, Cumulative Distribution																														$ 5.20
Non-Controlling Partners
Distribution Made to Member or Limited Partner [Line Items]
Contribution from issuance of units																														$ 0.0	0.0
Issuance of preferred equity of subsidiary																															175.0
Non-Controlling Partners \| CMLP
Distribution Made to Member or Limited Partner [Line Items]
Issuance of preferred equity of subsidiary																															$ 175.0