Schedule I - Crestwood Equity Partners LP - Parent Only - Statement of Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Net loss	$ (2,303.7)	$ (10.4)	$ (50.6)
Change in fair value of Suburban Propane Partners, LP units	(2.7)	(0.5)	(0.1)
Comprehensive income (loss) attributable to Crestwood Equity Partners LP	(1,669.6)	55.9	6.6
Parent Company
Condensed Financial Statements, Captions [Line Items]
Net loss	(2,303.7)	(10.4)	(50.6)
Change in fair value of Suburban Propane Partners, LP units	(2.7)	(0.5)	(0.1)
Comprehensive income (loss) attributable to Crestwood Equity Partners LP	$ (2,306.4)	$ (10.9)	$ (50.7)