Segments (Reconciliation of Net Income (Loss) to EBITDA) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) segment	Sep. 30, 2021 USD ($)
Segment Reporting, Other Significant Reconciling Item [Line Items]
Number of Operating Segments | segment			3
Net income (loss)	$ (43.0)	$ (39.6)	$ 18.6	$ (116.0)
Interest and debt expense, net	47.6	30.9	123.8	102.0
Provision for income taxes	1.4	0.1	1.7	0.1
Depreciation, amortization and accretion	86.9	64.6	242.3	182.6
EBITDA	92.9	56.0	386.4	175.4
Loss on modification/extinguishment of debt	0.0	0.0	0.0	6.7
Gain (loss) on long-lived assets	(175.9)	(18.5)	(186.9)	(19.6)
Eliminations
Segment Reporting, Other Significant Reconciling Item [Line Items]
Gain (loss) on long-lived assets			53.0
Crestwood Midstream Partners LP
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net income (loss)	(113.0)	(41.8)	(107.4)	(120.7)
Interest and debt expense, net	47.6	30.9	123.8	102.0
Provision for income taxes	1.4	0.1	1.6	0.1
Depreciation, amortization and accretion	86.8	68.2	248.0	193.2
EBITDA	22.8	57.4	266.0	181.3
Loss on modification/extinguishment of debt	0.0	0.0	0.0	6.7
Gain (loss) on long-lived assets	$ (247.6)	$ (18.5)	$ (311.9)	$ (19.6)