Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net loss	$ (166.6)	$ (192.1)	$ (2,303.7)
Change in fair value of Suburban Propane Partners, L.P. units	(0.8)	0.8	(2.7)
Comprehensive loss	(167.4)	(191.3)	(2,306.4)
Comprehensive income (loss) attributable to non-controlling partners	(25.3)	(24.2)	636.8
Comprehensive loss attributable to Crestwood Equity Partners LP	$ (192.7)	$ (215.5)	$ (1,669.6)