Segments (Reconciliation of Net Income (Loss) to EBITDA) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($) segment	Mar. 31, 2021 USD ($)
Segment Reporting, Other Significant Reconciling Item [Line Items]
Number of Operating Segments | segment	3
Net income (loss)	$ 22.2	$ (38.3)
Interest and debt expense, net	36.1	36.0
Benefit for income taxes	0.0	(0.1)
Depreciation, amortization and accretion	74.8	59.2
EBITDA	133.1	62.3
Loss on modification/extinguishment of debt	0.0	5.5
Crestwood Midstream Partners LP
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net income (loss)	20.2	(40.4)
Interest and debt expense, net	36.1	36.0
Benefit for income taxes	0.0	(0.1)
Depreciation, amortization and accretion	78.2	62.8
EBITDA	134.5	63.8
Loss on modification/extinguishment of debt	$ 0.0	$ 5.5