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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items]        
Cash flows from operating activities   $ 426.7 $ 408.1 $ 420.4
Cash flows from investing activities   568.9 (273.3) (943.7)
Payments on long-term debt   (3,287.5) (975.8) (1,729.5)
Distributions to partners   (164.3) (182.7) (172.4)
Net cash provided by (used in) financing activities   (996.3) (146.5) 531.8
Cash at beginning of period   14.0    
Cash at end of period   13.3 14.0  
Payments for Crestwood Holdings Transactions $ (268.0) (275.6) 0.0 0.0
Parent Company        
Condensed Financial Statements, Captions [Line Items]        
Cash flows from operating activities   (5.5) (9.4) (3.7)
Cash flows from investing activities   507.8 242.6 235.8
Distributions to partners   (224.4) (242.8) (232.5)
Change in intercompany balances   (2.3) 9.6 0.4
Net cash provided by (used in) financing activities   (502.3) (233.2) (232.1)
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
Payments for Crestwood Holdings Transactions   $ (275.6) $ 0.0 $ 0.0