Partners' Capital Net Income (Loss) Attributable to NonControlling Partners (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Limited Partners' Capital Account [Line Items]
Net income attributable to non-controlling partners in subsidiary	$ (636.8)	$ (66.8)	$ (57.3)
CMLP
Limited Partners' Capital Account [Line Items]
Net income attributable to non-controlling partners in subsidiary	23.1	16.8	4.9
CMLP | Preferred Units, Class A
Limited Partners' Capital Account [Line Items]
Net income attributable to non-controlling partners in subsidiary	23.1	17.2	0.0
Crestwood Niobrara LLC
Limited Partners' Capital Account [Line Items]
Net income attributable to non-controlling partners in subsidiary	(23.1)	16.8	4.9
Limited Partners | CMLP
Limited Partners' Capital Account [Line Items]
Net income attributable to non-controlling partners in subsidiary	$ (683.0)	$ 100.8	$ 62.2