Partners' Capital Net Income (Loss) Attributable to NonControlling Partners (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Limited Partners' Capital Account [Line Items]
Net income attributable to non-controlling partners in subsidiary	$ 24.2	$ (636.8)	$ (66.8)
CMLP
Limited Partners' Capital Account [Line Items]
Net income attributable to non-controlling partners in subsidiary	24.2	23.1	16.8
CMLP | Preferred Units, Class A
Limited Partners' Capital Account [Line Items]
Net income attributable to non-controlling partners in subsidiary	0.0	23.1	17.2
Crestwood Niobrara LLC
Limited Partners' Capital Account [Line Items]
Net income attributable to non-controlling partners in subsidiary	(24.2)	23.1	16.8
Limited Partners | CMLP
Limited Partners' Capital Account [Line Items]
Net income attributable to non-controlling partners in subsidiary	$ 0.0	$ 683.0	$ 100.8