Schedule I - Crestwood Equity Partners LP - Parent Only - Condensed Statement of Cash Flows (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities		$ 439.2	$ 426.7	$ 408.1
Cash flows from investing activities		(391.1)	568.9	(273.3)
Payments on long-term debt		(3,254.3)	(3,287.5)	(975.8)
Distributions to partners		(265.2)	(164.3)	(182.7)
Purchase of common units		(123.7)	0.0	0.0
Payments for Crestwood Holdings Transactions	$ (268.0)	0.0	(275.6)	0.0
Net cash used in financing activities		(53.9)	(996.3)	(146.5)
Net change in cash		(5.8)	(0.7)	(11.7)
Cash at beginning of period		13.3
Cash at end of period		7.5	13.3
Parent Company
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities		67.8	(5.5)	(9.4)
Cash flows from investing activities		455.6	507.8	242.6
Distributions to partners		(325.3)	(224.4)	(242.8)
Purchase of common units		(123.7)	0.0	0.0
Payments for Crestwood Holdings Transactions		0.0	(275.6)	0.0
Change in intercompany balances		(74.4)	(2.3)	9.6
Net cash used in financing activities		(523.4)	(502.3)	(233.2)
Net change in cash		0.0	0.0	0.0
Cash at beginning of period		0.2	0.2	0.2
Cash at end of period		$ 0.2	$ 0.2	$ 0.2

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