Consolidated Statement of Partners' Capital - USD ($) $ in Millions	Total	Preferred Units	Common unit	Non-Controlling Partners	Partners' Capital	Crestwood Midstream Partners LP	Crestwood Midstream Partners LP Common unit	Crestwood Midstream Partners LP Non-Controlling Partners	Crestwood Midstream Partners LP Partners' Capital	Common Units	Preferred Units	Subordinated Units
Common Unit, Outstanding										68,200,000		400,000
Preferred Units, Outstanding	60,718,245										60,700,000
Preferred Stock Dividends, Shares	4,311,143										4,300,000
Balance at December 31, 2015 at Dec. 31, 2015	$ 2,763.4	$ 535.8	$ 2,227.6	$ 183.5	$ 2,946.9	$ 2,981.6	$ 2,981.6	$ 183.5	$ 3,165.1
Increase (Decrease) in Partners' Capital [Roll Forward]
Distributions to partners		0.0	(178.4)	(11.4)	(189.8)	(185.0)	(185.0)	(11.4)	(196.4)
Change in fair value of Suburban Propane Partners, L.P. units	1.3	0.0	1.3	0.0	1.3
Unit-based compensation charges		0.0	13.4	0.0	13.4		13.4	0.0	13.4
Partners' Capital Account, Units, Unit-based Compensation										900,000
Taxes paid for unit-based compensation vesting		0.0	(0.8)	0.0	(0.8)		(0.8)	0.0	(0.8)
Other							(0.2)	0.0	(0.2)
Net income (loss) attributable to preferred unit holders	16.6	16.6				0.0
Net loss attributable to partners	(162.4)		(162.4)			(148.3)
Net Income (Loss) Attributable to Noncontrolling Interest	18.0			18.0		18.0
Net income (loss)	(127.8)				(127.8)	(130.3)	(148.3)		(130.3)
Balance at September 30, 2016 at Sep. 30, 2016	$ 2,453.1	$ 552.4	$ 1,900.7	$ 190.1	$ 2,643.2	$ 2,660.7	$ 2,660.7	$ 190.1	$ 2,850.8
Common Unit, Outstanding										69,100,000		400,000
Preferred Units, Outstanding	65,029,388										65,000,000