Consolidated Statement of Partners' Capital - USD ($) $ in Millions	Total	CMLP	Preferred Units	Common Unit Capital	Common Unit Capital CMLP	Limited Partners	Limited Partners CMLP	Non-Controlling Partner	Non-Controlling Partner CMLP	Total Partners’ Capital	Total Partners’ Capital CMLP	Subordinated units	Common units	Preferred Units
Balance at the beginning of the period at Dec. 31, 2018			$ 612.0			$ 1,240.5	$ 2,028.2	$ 181.3	$ 181.3	$ 2,033.8	$ 2,209.5
Balance at the beginning of the period (in units) at Dec. 31, 2018												400,000	71,200,000
Preferred units balance at the beginning of the period (in units) at Dec. 31, 2018														71,300,000
Increase (Decrease) in Partners' Capital [Roll Forward]
Unit-based compensation charges						42.4	42.4			42.4	42.4
Unit-based compensation charges (in units)													1,000,000.0
Taxes paid for unit-based compensation vesting						(11.0)	(11.0)			(11.0)	(11.0)
Taxes paid for unit-based compensation vesting (in units)													(300,000)
Distributions to partners			(60.1)			(172.4)	(235.8)	(6.6)	(6.6)	(239.1)	(242.4)
Change in fair value of Suburban Propane Partners, L.P. units						0.3				0.3
Non-controlling interest reclassification (Note 12)	$ 178.8							(178.8)	(178.8)	(178.8)	(178.8)
Other				$ (4.0)	$ (0.3)			0.1	0.1	(3.9)	(0.2)
Net income (loss)	319.9	$ 310.6	60.1			225.0	275.8	4.0	4.0	289.1	279.8
Balance at the beginning of the period (in units) at Dec. 31, 2019												400,000	71,900,000
Preferred units balance at the end of the period (in units) at Dec. 31, 2019														71,300,000
Balance at the end of the period at Dec. 31, 2019			612.0			1,320.8	2,099.3	0.0	0.0	1,932.8	2,099.3
Increase (Decrease) in Partners' Capital [Roll Forward]
Unit-based compensation charges						34.0	29.3			34.0	29.3
Unit-based compensation charges (in units)													2,100,000
Taxes paid for unit-based compensation vesting						(15.6)	(15.6)			(15.6)	(15.6)
Taxes paid for unit-based compensation vesting (in units)													(600,000)
Stockholders' Equity, Other Shares													200,000
Distributions to partners			(60.1)			(182.7)	(242.6)			(242.8)	(242.6)
Other				3.1	(1.1)					3.1	(1.1)
Net income (loss)	$ (15.3)	(23.4)	60.1			(116.2)	(64.2)			(56.1)	(64.2)
Balance at the beginning of the period (in units) at Dec. 31, 2020												400,000	73,600,000
Preferred units balance at the end of the period (in units) at Dec. 31, 2020	71,257,445													71,300,000
Balance at the end of the period at Dec. 31, 2020		1,805.1	612.0			1,043.4	1,805.1	0.0	0.0	1,655.4	1,805.1
Increase (Decrease) in Partners' Capital [Roll Forward]
Total partners’ capital	$ 1,655.4
Contingent consideration - current portion	19.0	19.0
Crestwood Holdings Transactions (Note 12)				(273.2)						(273.2)
Unit-based compensation charges						32.0	30.5			32.0	30.5
Unit-based compensation charges (in units)													1,300,000
Taxes paid for unit-based compensation vesting						(8.4)	(8.4)			(8.4)	(8.4)
Taxes paid for unit-based compensation vesting (in units)													(400,000)
Retirement of units (Note 12)												(400,000)	(11,500,000)
Distributions to partners			(60.1)			(164.3)	(509.7)			(224.4)	(509.7)
Other				$ (3.3)	$ (0.1)					(3.3)	(0.1)
Net income (loss)	$ (37.4)	(44.0)	60.1			(138.6)	(85.1)			(78.5)	(85.1)
Balance at the beginning of the period (in units) at Dec. 31, 2021												0	63,000,000.0
Preferred units balance at the end of the period (in units) at Dec. 31, 2021	71,257,445													71,300,000
Balance at the end of the period at Dec. 31, 2021		1,232.3	$ 612.0			$ 487.6	$ 1,232.3	$ 0.0	$ 0.0	$ 1,099.6	$ 1,232.3
Increase (Decrease) in Partners' Capital [Roll Forward]
Total partners’ capital	$ 1,099.6
Contingent consideration - current portion	$ 0.0	$ 0.0