Investments in Unconsolidated Affiliates (Distributions and Contributions) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Apr. 30, 2022	Mar. 31, 2022	Mar. 31, 2021
Schedule of Equity Method Investments [Line Items]
Proceeds from equity method investments		$ 8.5	$ 17.4
Payments to acquire equity method investments		14.5	10.2
Crestwood Permian Basin Holdings LLC
Schedule of Equity Method Investments [Line Items]
Proceeds from equity method investments		8.5	3.3
Payments to acquire equity method investments		8.5	3.3
Tres Palacios Holdings LLC
Schedule of Equity Method Investments [Line Items]
Proceeds from equity method investments		0.0	0.0
Payments to acquire equity method investments		6.0	6.9
Powder River Basin Industrial Complex, LLC
Schedule of Equity Method Investments [Line Items]
Proceeds from equity method investments		0.0	0.1
Payments to acquire equity method investments		0.0	0.0
Stagecoach Gas Services LLC
Schedule of Equity Method Investments [Line Items]
Proceeds from equity method investments		0.0	14.0
Payments to acquire equity method investments		$ 0.0	$ 0.0
Subsequent Event | Crestwood Permian Basin Holdings LLC
Schedule of Equity Method Investments [Line Items]
Proceeds from equity method investments	$ 5.1
Subsequent Event | Tres Palacios Holdings LLC
Schedule of Equity Method Investments [Line Items]
Proceeds from equity method investments	$ 1.4