Investments in Unconsolidated Affiliates (Schedule) (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Jul. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2020	Apr. 09, 2019	Apr. 08, 2019
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates		$ 155.8	$ 943.7
Earnings (loss) from unconsolidated affiliates, net		(120.4)	32.5	$ 32.8
Distributions(1)		672.7	78.4	75.2
Contributions(2)		17.6	9.4	61.3
Assets, Current		604.7	405.9
Liabilities, Current		598.4	377.8
Revenues		4,569.0	2,254.3	3,181.9
Operating Expenses		502.4	567.0	234.8
Net income (loss)		(37.4)	(15.3)	319.9
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule of Equity Method Investments [Line Items]
Assets, Current		46.5	70.9
Assets, Noncurrent		679.2	2,307.4
Liabilities, Current		58.6	37.5
Liabilities, Noncurrent		236.5	235.1
Members' Equity		430.6	2,105.7
Revenues		417.5	275.6	283.7
Operating Expenses		757.5	224.9	209.5
Net income (loss)		$ (339.6)	50.9	74.6
Stagecoach Gas Services LLC
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage		0.00%
Investments in unconsolidated affiliates		$ 0.0	792.5
Earnings (loss) from unconsolidated affiliates, net		(139.2)	37.8	34.2
Distributions(1)	$ 613.9	640.9	59.7	52.3
Contributions(2)		0.0	0.0	2.1
Difference between carrying amount and underlying equity		51.3
Stagecoach Gas Services LLC | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule of Equity Method Investments [Line Items]
Earnings (loss) from unconsolidated affiliates, net		155.6
Assets, Current		0.0	47.4
Assets, Noncurrent		0.0	1,645.5
Liabilities, Current		0.0	3.9
Liabilities, Noncurrent		0.0	1.4
Members' Equity		0.0	1,687.6
Revenues		81.9	154.3	163.8
Operating Expenses		456.7	78.8	83.6
Net income (loss)		(374.6)	75.5	80.6
Crestwood Permian Basin LLC
Schedule of Equity Method Investments [Line Items]
Difference between carrying amount and underlying equity		8.2
Jackalope Gas Gathering Services, LLC
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage						50.00%	50.00%
Investments in unconsolidated affiliates		0.0	0.0
Earnings (loss) from unconsolidated affiliates, net		0.0	0.0	3.7
Distributions(1)		0.0	0.0	11.6
Amortization				0.1
Other Equity Method Investments | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule of Equity Method Investments [Line Items]
Assets, Current		46.5	23.5
Assets, Noncurrent		679.2	661.9
Liabilities, Current		58.6	33.6
Liabilities, Noncurrent		236.5	233.7
Members' Equity		430.6	418.1
Revenues		335.6	121.3	119.9
Operating Expenses		300.8	146.1	125.9
Net income (loss)		$ 35.0	(24.6)	(6.0)
Crestwood Permian Basin Holdings LLC
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage		50.00%			50.00%
Investments in unconsolidated affiliates		$ 116.1	112.1
Earnings (loss) from unconsolidated affiliates, net		9.6	(1.0)	(5.8)
Distributions(1)		16.3	11.9	5.0
Contributions(2)		$ 10.7	3.4	28.3
Tres Palacios Holdings LLC
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage		50.01%
Investments in unconsolidated affiliates		$ 36.2	35.5
Earnings (loss) from unconsolidated affiliates, net		9.3	0.0	0.9
Distributions(1)		15.5	6.4	6.3
Contributions(2)		6.9	6.0	6.3
Difference between carrying amount and underlying equity		21.4
Amortization		$ 1.3	1.3	1.3
Powder River Basin Industrial Complex, LLC
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage		50.01%
Investments in unconsolidated affiliates		$ 3.5	3.6
Earnings (loss) from unconsolidated affiliates, net		(0.1)	(4.3)	(0.2)
Distributions(1)		0.0	0.4	0.0
Contributions(2)		0.0	0.0	0.2
Difference between carrying amount and underlying equity		5.5
Amortization				0.4
Crestwood Niobrara LLC | Jackalope Gas Gathering Services, LLC
Schedule of Equity Method Investments [Line Items]
Contributions(2)		$ 0.0	$ 0.0	$ 24.4
Crestwood Niobrara LLC | Williams Partners LP
Schedule of Equity Method Investments [Line Items]
Additional voting interest acquired						50.00%