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Schedule I - Crestwood Equity Partners LP - Parent Only - Condensed Statement of Cash Flows (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]      
Cash flows from operating activities $ 420.4 $ 253.6 $ 255.9
Cash flows from investing activities (943.7) (241.2) 38.7
Payments on long-term debt (1,729.5) (2,015.7) (2,913.9)
Distributions to partners (172.4) (170.8) (167.6)
Net proceeds from issuance of common units 0.0 0.0 15.2
Net cash provided by (used in) financing activities 531.8 3.5 (294.9)
Cash at beginning of period 0.9    
Cash at end of period 25.7 0.9  
Parent Company      
Condensed Financial Statements, Captions [Line Items]      
Cash flows from operating activities (3.7) (3.8) (3.6)
Cash flows from investing activities 235.8 238.4 174.0
Distributions to partners (232.5) (230.9) (182.6)
Net proceeds from issuance of common units 0.0 0.0 15.2
Change in intercompany balances 0.4 (3.8) (3.0)
Net cash provided by (used in) financing activities (232.1) (234.7) (170.4)
Net change in cash 0.0 (0.1) 0.0
Cash at beginning of period 0.2 0.3 0.3
Cash at end of period $ 0.2 $ 0.2 $ 0.3