Investments in Unconsolidated Affiliates (Distributions and Contributions) (Details) - USD ($) $ in Millions	1 Months Ended		9 Months Ended
	Oct. 31, 2022	Jul. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Schedule of Equity Method Investments [Line Items]
Proceeds from equity method investments			$ 20.7	$ 663.0
Payments to acquire equity method investments			90.2	10.2
Crestwood Permian Basin Holdings LLC
Schedule of Equity Method Investments [Line Items]
Proceeds from equity method investments			13.6	8.9
Payments to acquire equity method investments			83.5	3.3
Crestwood Permian Basin LLC
Schedule of Equity Method Investments [Line Items]
Proceeds from equity method investments			2.2	0.0
Payments to acquire equity method investments			0.0	0.0
Tres Palacios Holdings LLC
Schedule of Equity Method Investments [Line Items]
Proceeds from equity method investments			4.9	13.1
Payments to acquire equity method investments			6.7	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		$ 613.9	0.0	640.9
Payments to acquire equity method investments			$ 0.0	$ 0.0
Subsequent Event | Tres Palacios Holdings LLC
Schedule of Equity Method Investments [Line Items]
Proceeds from equity method investments	$ 3.9
Payments to acquire equity method investments	0.4
Subsequent Event | Powder River Basin Industrial Complex, LLC
Schedule of Equity Method Investments [Line Items]
Payments to acquire equity method investments	$ 0.3