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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Partners' Capital (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions																											1 Months Ended				12 Months Ended
	Feb. 14, 2020	Feb. 07, 2020	Nov. 14, 2019	Nov. 07, 2019	Aug. 14, 2019	Aug. 07, 2019	May 15, 2019	May 08, 2019	Feb. 14, 2019	Feb. 07, 2019	Nov. 14, 2018	Nov. 07, 2018	Aug. 14, 2018	Aug. 07, 2018	May 15, 2018	May 08, 2018	Feb. 14, 2018	Feb. 07, 2018	Nov. 14, 2017	Nov. 07, 2017	Aug. 14, 2017	Aug. 07, 2017	May 15, 2017	May 08, 2017	Feb. 14, 2017	Feb. 07, 2017	Jan. 31, 2020	Apr. 30, 2019	Dec. 31, 2017	Nov. 30, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Apr. 09, 2019	Apr. 08, 2019
Distribution Made to Member or Limited Partner [Line Items]
Distribution to limited partner, distribution date			Nov. 14, 2019		Aug. 14, 2019		May 15, 2019		Feb. 14, 2019		Nov. 14, 2018		Aug. 14, 2018		May 15, 2018		Feb. 14, 2018		Nov. 14, 2017		Aug. 14, 2017		May 15, 2017		Feb. 14, 2017
Maximum Period For Distribution Of Available Cash																															45 days
Per unit rate, in dollars per unit			$ 0.60		$ 0.60		$ 0.60		$ 0.60		$ 0.60		$ 0.60		$ 0.60		$ 0.60		$ 0.60		$ 0.60		$ 0.60		$ 0.60
Distributions to partners																															$ (172.4)	$ (170.8)	$ (167.6)
Contributions																															61.3	64.4	58.0
Loss on contingent consideration																															0.0	0.0	$ (57.0)
Distribution made to limited partners																																	4,724,030
Distributions paid to non-controlling partners																															$ 25.0	$ 9.9	$ 15.2
Limited partners' units, issued																															72,282,942	71,659,385
Dividends, Paid-in-kind																																	$ 43.1
Preferred units, outstanding (in units)																															71,257,445	71,257,445
Preferred units, issued																															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
Issuance of common units (in units)																															0	0	633,271
Proceeds from Issuance or Sale of Equity																																$ 15.2
Distributions to preferred unitholders																														$ 15.0	$ 60.1	60.1	$ 15.0
Distribution to limited partner, record date				Nov. 07, 2019		Aug. 07, 2019		May 08, 2019		Feb. 07, 2019		Nov. 07, 2018		Aug. 07, 2018		May 08, 2018		Feb. 07, 2018		Nov. 07, 2017		Aug. 07, 2017		May 08, 2017		Feb. 07, 2017
Payments for Repurchase of Redeemable Noncontrolling Interest																													$ 202.7		0.0	0.0	202.7
Proceeds from Noncontrolling Interests																													$ 175.0		235.0	0.0	175.0
Maximum Value of Common Units to be Issued Under Optional Redemption																															$ 100.0
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
Distribution Made to Member or Limited Partner [Line Items]
Percentage of voting interests acquired																																		100.00%
Proceeds from Noncontrolling Interests																												$ 235.0
Crestwood Niobrara LLC \| Cash distribution
Distribution Made to Member or Limited Partner [Line Items]
Distributions paid to non-controlling partners																															$ 25.0	9.9	15.2
Crestwood Niobrara LLC \| Subsequent Event \| Cash distribution
Distribution Made to Member or Limited Partner [Line Items]
Distributions paid to non-controlling partners																											$ 9.2
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																															$ (235.8)	(238.4)	(174.0)
Contributions																															61.3	64.4	58.0
Loss on contingent consideration																															0.0	0.0	(57.0)
Distributions paid to non-controlling partners																															25.0	9.9	15.2
Distribution Made to General Partner, Cash Distributions Paid																															235.8	238.4	174.0
Payments for Repurchase of Redeemable Noncontrolling Interest																															0.0	0.0	202.7
Proceeds from Noncontrolling Interests																															235.0	0.0	175.0
Tres Palacios Holdings LLC
Distribution Made to Member or Limited Partner [Line Items]
Contributions																															$ 6.3	2.5	5.6
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%			0.00%			50.00%	50.00%
Equity Interest																												50.00%			50.00%
Jackalope Gas Gathering Services, LLC \| Crestwood Niobrara LLC
Distribution Made to Member or Limited Partner [Line Items]
Contributions																															$ 24.4	$ 49.1	$ 3.5
Cash distribution \| Subsequent Event
Distribution Made to Member or Limited Partner [Line Items]
Distribution to limited partner, distribution date	Feb. 14, 2020
Distribution declared per limited partner unit	$ 0.625
Distribution to limited partner, record date		Feb. 07, 2020
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				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 Partner
Distribution Made to Member or Limited Partner [Line Items]
Issuance of non-controlling interest																																	$ 175.0
Non-Controlling Partner \| CMLP
Distribution Made to Member or Limited Partner [Line Items]
Issuance of non-controlling interest																																	$ 175.0
Williams Partners LP \| Crestwood Niobrara LLC
Distribution Made to Member or Limited Partner [Line Items]
Additional voting interest acquired																																		50.00%