Investments in Unconsolidated Affiliates (Distributions and Contributions) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Schedule of Equity Method Investments [Line Items]
Distributions	$ 6.3	$ 20.7
Contributions	7.2	90.2
Crestwood Permian Basin LLC
Schedule of Equity Method Investments [Line Items]
Distributions	6.3	2.2
Contributions	1.8	0.0
Tres Palacios Holdings LLC
Schedule of Equity Method Investments [Line Items]
Distributions	0.0	4.9
Contributions	5.1	6.7
Powder River Basin Industrial Complex, LLC
Schedule of Equity Method Investments [Line Items]
Distributions	0.0	0.0
Contributions	0.3	0.0
Crestwood Permian Basin Holdings LLC
Schedule of Equity Method Investments [Line Items]
Distributions	0.0	13.6
Contributions	$ 0.0	$ 83.5