Investments in Unconsolidated Affiliates (Distributions and Contributions) (Details) - USD ($) $ in Millions	1 Months Ended	6 Months Ended
	Jul. 31, 2022	Jun. 30, 2022	Jun. 30, 2021
Schedule of Equity Method Investments [Line Items]
Proceeds from equity method investments		$ 15.0	$ 43.2
Payments to acquire equity method investments		15.0	10.2
Crestwood Permian Basin Holdings LLC
Schedule of Equity Method Investments [Line Items]
Proceeds from equity method investments		13.6	5.5
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		1.4	10.6
Payments to acquire equity method investments		6.5	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	27.0
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	$ 5.9
Payments to acquire equity method investments	75.0
Subsequent Event | Tres Palacios Holdings LLC
Schedule of Equity Method Investments [Line Items]
Proceeds from equity method investments	3.4
Payments to acquire equity method investments	$ 0.3