Fair Value Measurements (Schedule of Carrying Values and Estimated Fair Values of Senior Notes) (Details) - Crestwood Midstream Partners LP - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
2025 Senior Notes
Debt Instrument [Line Items]
Carrying Amount	$ 497.3	$ 496.5
Fair Value	473.5	511.9
2027 Senior Notes
Debt Instrument [Line Items]
Carrying Amount	595.1	594.2
Fair Value	545.6	615.0
February 2029 Senior Notes
Debt Instrument [Line Items]
Carrying Amount	691.8	690.8
Fair Value	627.2	727.3
April 2029 Senior Notes
Debt Instrument [Line Items]
Carrying Amount	477.8	0.0
Fair Value	$ 433.1	$ 0.0