Consolidated Statement of Partners' Capital - USD ($) $ in Millions	Total	CMLP	Preferred Units	Common Unit Capital	Limited Partners	Total Partners’ Capital	Total Partners’ Capital CMLP	Subordinated units	Common units	Preferred Units	Common Stock
Balance at the beginning of the period at Dec. 31, 2019			$ 612.0		$ 1,320.8	$ 1,932.8	$ 2,099.3
Balance at the beginning of the period (in units) at Dec. 31, 2019								400,000	71,900,000
Preferred units balance at the beginning of the period (in units) at Dec. 31, 2019										71,300,000
Increase (Decrease) in Partners' Capital [Roll Forward]
Unit-based compensation charges					34.0	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)
Taxes paid for unit-based compensation vesting (in units)									(600,000)
Other									200,000
Partners' Capital Account, Distributions			(60.1)		(182.7)	(242.8)	(242.6)
Partners' Capital, Other				$ 3.1		3.1	(1.1)
Net income (loss)	$ (15.3)	$ (23.4)	60.1		(116.2)	(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										71,300,000
Balance at the end of the period at Dec. 31, 2020			612.0		1,043.4	1,655.4	1,805.1
Increase (Decrease) in Partners' Capital [Roll Forward]
Crestwood Holdings Transactions (Note 12)				(273.2)		(273.2)
Unit-based compensation charges					32.0	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)
Taxes paid for unit-based compensation vesting (in units)									(400,000)
Retirement of units (Note 12)								(400,000)	(11,500,000)
Partners' Capital Account, Distributions			(60.1)		(164.3)	(224.4)	(509.7)
Partners' Capital, Other				(3.3)		(3.3)	(0.1)
Net income (loss)	$ (37.4)	(44.0)	60.1		(138.6)	(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	1,099.6	1,232.3
Increase (Decrease) in Partners' Capital [Roll Forward]
Total partners’ capital	$ 1,099.6
Non-cash contributions from partner (Note 12)							1,202.4
Cash contributions from partner (Note 12)							164.3
Issuance of common units (Note 3) (in units)											45,100,000
Issuance of common units (Note 3)				1,200.8		1,200.8
Purchase of common units (Note 12)				(123.7)		(123.7)
Unit-based compensation charges					39.8	39.8	39.8
Unit-based compensation charges (in units)									1,600,000
Taxes paid for unit-based compensation vesting					(15.9)	(15.9)	(15.9)
Taxes paid for unit-based compensation vesting (in units)									(600,000)
Other									100,000
Retirement of units (Note 12)									(4,600,000)
Partners' Capital Account, Distributions			(60.1)		(265.2)	(325.3)	(622.2)
Partners' Capital, Other				$ 0.6		0.6
Net income (loss)	$ 72.5	(52.2)	60.1		(28.8)	31.3	(93.4)
Balance at the beginning of the period (in units) at Dec. 31, 2022								0	104,600,000
Preferred units balance at the end of the period (in units) at Dec. 31, 2022	71,257,445									71,300,000
Balance at the end of the period at Dec. 31, 2022		$ 1,907.3	$ 612.0		$ 1,295.2	$ 1,907.2	$ 1,907.3
Increase (Decrease) in Partners' Capital [Roll Forward]
Total partners’ capital	$ 1,907.2