Segments (Reconciliation of Net Income (Loss) to EBITDA) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($) segment	Mar. 31, 2015 USD ($)
Segment Reporting, Other Significant Reconciling Item [Line Items]
Number of Operating Segments | segment	3
Net income (loss)	$ (93.7)	$ 18.1
Interest and debt expense, net	36.1	33.6
Provision for income taxes	0.0	(0.4)
Depreciation, amortization and accretion	62.3	74.2
EBITDA	4.7	126.3
Crestwood Midstream Partners LP
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net income (loss)	(95.3)	29.1
Interest and debt expense, net	36.1	29.9
Provision for income taxes	0.2	(0.4)
Depreciation, amortization and accretion	64.9	68.8
EBITDA	$ 5.5	$ 128.2