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Investments in Unconsolidated Affiliates Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Business Combination, Contingent Consideration, Liability, Current	$ 19.0		$ 0.0
Business Combination, Contingent Consideration, Liability, Noncurrent	38.0		57.0
Payments to Acquire Property, Plant, and Equipment	86.8	$ 68.5
Crestwood Permian Basin Holdings LLC
Schedule of Equity Method Investments [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 10.0
Ownership percentage	50.00%
Stagecoach Gas Services LLC
Schedule of Equity Method Investments [Line Items]
Business Combination, Contingent Consideration, Liability	$ 57.0
Business Combination, Contingent Consideration, Liability, Noncurrent	$ 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]
Business Combination, Contingent Consideration, Liability, Current	$ 19.0		$ 0.0
Payments to Acquire Property, Plant, and Equipment	$ 86.8	$ 68.5