Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (23.4)	$ 14.1
Change in fair value of Suburban Propane Partners, L.P. units	(1.1)	0.4
Comprehensive income (loss)	(24.5)	14.5
Comprehensive income attributable to non-controlling partner	9.9	4.0
Comprehensive income (loss) attributable to Crestwood Equity Partners LP	$ (34.4)	$ 10.5