Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 67.0	$ (166.6)	$ (192.1)
Change in fair value of Suburban Propane Partners, L.P. units	(0.7)	(0.8)	0.8
Comprehensive income (loss)	66.3	(167.4)	(191.3)
Comprehensive income (loss) attributable to non-controlling partners	(16.2)	(25.3)	(24.2)
Comprehensive income (loss) attributable to Crestwood Equity Partners LP	$ 50.1	$ (192.7)	$ (215.5)