Fair Value Measurements (Schedule of Carrying Values and Estimated Fair Values of Senior Notes) (Details) - Crestwood Midstream Partners LP - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
2025 Senior Notes
Debt Instrument [Line Items]
Carrying Amount	$ 497.1	$ 496.5
Fair Value	471.1	511.9
2027 Senior Notes
Debt Instrument [Line Items]
Carrying Amount	594.8	594.2
Fair Value	537.0	615.0
February 2029 Senior Notes
Debt Instrument [Line Items]
Carrying Amount	691.5	690.8
Fair Value	614.5	727.3
April 2029 Senior Notes
Debt Instrument [Line Items]
Carrying Amount	478.9	0.0
Fair Value	$ 420.3	$ 0.0