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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Investments in Unconsolidated Affiliates - Narrative (Details) - USD ($) $ in Millions				1 Months Ended		6 Months Ended	12 Months Ended
	Jul. 01, 2018	Jan. 01, 2018	Jun. 21, 2017	Jan. 31, 2020	Oct. 31, 2017	Jun. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2019	Apr. 30, 2019	Apr. 09, 2019	Apr. 08, 2019
Schedule of Equity Method Investments [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification							$ 0.7
Contributions							61.3	$ 64.4	$ 58.0
Investments in unconsolidated affiliates							980.4	1,188.2
Contingent consideration							57.0	57.0
Loss on contingent consideration							0.0	0.0	57.0
Earnings from unconsolidated affiliates, net							32.8	53.3	47.8
Net proceeds from sale of assets							0.8	79.5	225.2
Contribution of Property			$ 69.4
Distributions							75.2	103.0	107.6
Jackalope Gas Gathering Services, LLC
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates							0.0	210.2				$ 226.7
Earnings from unconsolidated affiliates, net							3.7	18.1	10.5
Amortization							$ 0.1	0.1	0.1
Equity method ownership percentage							0.00%				50.00%	50.00%	50.00%
Distributions							$ 11.6	32.4	26.3
Tres Palacios Holdings LLC
Schedule of Equity Method Investments [Line Items]
Contributions							6.3	2.5	5.6
Investments in unconsolidated affiliates							35.9	35.0
Earnings from unconsolidated affiliates, net							0.9	0.0	2.2
Difference between carrying amount and underlying equity							24.0
Amortization							$ 1.3	1.3	1.3
Equity method ownership percentage							50.01%
Distributions							$ 6.3	5.3	9.0
Powder River Basin Industrial Complex, LLC
Schedule of Equity Method Investments [Line Items]
Contributions							0.2	0.2	0.0
Investments in unconsolidated affiliates							8.3	8.3
Earnings from unconsolidated affiliates, net							(0.2)	1.5	1.4
Difference between carrying amount and underlying equity							5.5
Amortization							$ 0.4	0.5	0.6
Equity method ownership percentage							50.01%
Distributions							$ 0.0	1.9	1.6
Crestwood Permian Basin Holdings
Schedule of Equity Method Investments [Line Items]
Percentage of Available Cash Distributed							100.00%
Crestwood Permian Basin Holdings \| Subsequent Event
Schedule of Equity Method Investments [Line Items]
Distributions				$ 3.8
Crestwood Permian Basin LLC
Schedule of Equity Method Investments [Line Items]
Difference between carrying amount and underlying equity							$ 11.5
Net proceeds from sale of assets					$ 37.9
Stagecoach Gas Services LLC
Schedule of Equity Method Investments [Line Items]
Percentage of Available Cash Distributed	40.00%
Contributions							2.1	0.0	0.8
Investments in unconsolidated affiliates							814.4	830.4
Contingent consideration							57.0	57.0
Earnings from unconsolidated affiliates, net							34.2	29.3	25.3
Difference between carrying amount and underlying equity							$ 51.3
Equity Method Investment Distribution Percentage										40.00%
Equity method ownership percentage	50.00%						50.00%
Distributions							$ 52.3	48.7	47.3
Stagecoach Gas Services LLC \| Subsequent Event
Schedule of Equity Method Investments [Line Items]
Distributions				$ 15.5
Crestwood Permian Basin Holdings LLC
Schedule of Equity Method Investments [Line Items]
Contributions							28.3	12.6
Investments in unconsolidated affiliates							121.8	104.3
Earnings from unconsolidated affiliates, net							$ (5.8)	4.4	8.4
Equity method ownership percentage							50.00%
Distributions					$ 18.9		$ 5.0	14.7	23.4
Guarantee to third party amount							10.0
Crestwood Niobrara LLC
Schedule of Equity Method Investments [Line Items]
Percentage of voting interests acquired												100.00%
Crestwood Niobrara LLC \| Jackalope Gas Gathering Services, LLC
Schedule of Equity Method Investments [Line Items]
Contributions							$ 24.4	49.1	$ 3.5
Crestwood Equity Partners LP \| Crestwood Permian Basin Holdings LLC
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage									50.00%
First Reserve Management, L.P. \| Crestwood Permian Basin Holdings LLC
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage									50.00%
SWEPI LP \| Crestwood Permian Basin LLC
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage					50.00%
Twin Eagle Powder River Basin, LLC \| Powder River Basin Industrial Complex, LLC
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage							50.00%
CEGP \| Stagecoach Gas Services LLC
Schedule of Equity Method Investments [Line Items]
Percentage of Available Cash Distributed						35.00%
CMLP
Schedule of Equity Method Investments [Line Items]
Contributions							$ 61.3	64.4	$ 58.0
Investments in unconsolidated affiliates							980.4	1,188.2
Loss on contingent consideration							0.0	0.0	57.0
Earnings from unconsolidated affiliates, net							32.8	53.3	47.8
Net proceeds from sale of assets							$ 0.8	$ 79.5	$ 225.2
CMLP \| Tres Palacios Holdings LLC
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage							50.01%
CMLP \| Stagecoach Gas Services LLC
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage							50.00%
Brookfield Infrastructure Group \| Tres Palacios Holdings LLC
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage							49.99%
Accounting Standards Update 2014-09 \| Jackalope Gas Gathering Services, LLC
Schedule of Equity Method Investments [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		$ 9.5
New Accounting Pronouncement, Equity Earnings Decrease							$ 9.7
Williams Partners LP \| Crestwood Niobrara LLC
Schedule of Equity Method Investments [Line Items]
Additional voting interest acquired												50.00%
Business Acquisition, Percentage of Voting Interest After Acquisition												100.00%