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Investments in Unconsolidated Affiliates (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Jan. 01, 2020	Dec. 31, 2019	Apr. 30, 2019
Schedule of Equity Method Investments [Line Items]
Contingent consideration	$ 19.0			$ 0.0
Contingent consideration	38.0			57.0
Purchases of property, plant and equipment	158.8	$ 347.0
Jackalope Gas Gathering Services, L.L.C.
Schedule of Equity Method Investments [Line Items]
Ownership percentage		50.00%			50.00%
Crestwood Permian Basin Holdings LLC
Schedule of Equity Method Investments [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 10.0
Ownership percentage	50.00%		50.00%
Stagecoach Gas Services LLC
Schedule of Equity Method Investments [Line Items]
Business Combination, Contingent Consideration, Liability	$ 57.0
Contingent consideration	$ 38.0
Crestwood Equity Partners LP \| Crestwood Permian Basin Holdings
Schedule of Equity Method Investments [Line Items]
Ownership percentage	50.00%
Crestwood Midstream Partners LP
Schedule of Equity Method Investments [Line Items]
Contingent consideration	$ 19.0			0.0
Contingent consideration	38.0			$ 57.0
Purchases of property, plant and equipment	$ 158.8	$ 347.0