Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 3.0	$ (623.4)	$ (127.8)	$ (901.3)
Change in fair value of Suburban Propane Partners, L.P. units	0.0	(1.0)	1.3	(1.4)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	3.0	(624.4)	(126.5)	(902.7)
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	6.1	(396.5)	18.0	(642.7)
Comprehensive loss attributable to Crestwood Equity Partners LP	$ (3.1)	$ (227.9)	$ (144.5)	$ (260.0)