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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Related Party Transaction [Line Items]          
Purchases of property, plant and equipment     $ (143.2) $ (204.7)  
Operations and maintenance expenses charged by CEQP and CMLP $ 5.5 $ 5.9 11.7 13.4  
Tres Palacios Holdings LLC          
Related Party Transaction [Line Items]          
Costs of product/services sold at CEQP and CMLP 0.1   0.1    
Applied Consultants, Inc.          
Related Party Transaction [Line Items]          
Purchases of property, plant and equipment     (2.9) (5.1)  
Ascent Resources - Utica, LLC          
Related Party Transaction [Line Items]          
Costs of product/services sold at CEQP and CMLP 0.3 0.1 0.3 23.9  
Stagecoach Gas Services LLC          
Related Party Transaction [Line Items]          
Revenues at CEQP and CMLP   1.3   2.5  
Costs of product/services sold at CEQP and CMLP   0.1   2.3  
Crestwood Permian Basin Holdings LLC          
Related Party Transaction [Line Items]          
Revenues at CEQP and CMLP 7.5   15.0    
Costs of product/services sold at CEQP and CMLP 3.2 0.9 6.4 9.1  
Affiliated Entity          
Related Party Transaction [Line Items]          
Revenues at CEQP and CMLP 7.5 1.3 15.0 2.5  
Costs of product/services sold at CEQP and CMLP 3.6 0.9 6.8 35.3  
General and administrative expenses charged by CEQP to CMLP, net 10.9 10.1 18.0 21.1  
Related Party Transaction, Due from (to) Related Party [Abstract]          
Related party receivables 10.9   10.9   $ 7.3
Related party payables 6.9   6.9   15.6
Crestwood Equity Partners LP          
Related Party Transaction [Line Items]          
General and administrative expenses at CEQP charged to (from) Crestwood Holdings, net (1.5) (0.1) 11.3 (5.3)  
Crestwood Equity Partners LP | Affiliated Entity          
Related Party Transaction [Line Items]          
General and administrative expenses charged by CEQP to CMLP, net 0.2 0.1 0.4 0.3  
Crestwood Midstream Partners LP          
Related Party Transaction [Line Items]          
Purchases of property, plant and equipment     (143.2) (204.7)  
Revenues at CEQP and CMLP 0.1 0.0 0.3 0.0  
Crestwood Midstream Partners LP | Affiliated Entity          
Related Party Transaction [Line Items]          
General and administrative expenses charged by CEQP to CMLP, net 1.0 0.9 2.1 1.8  
Related Party Transaction, Due from (to) Related Party [Abstract]          
Related party payables 4.5   4.5   $ 13.1
Crestwood LTIP | Crestwood Midstream Partners LP          
Related Party Transaction [Line Items]          
Share-based Payment Arrangement, Expense 11.9 11.0 20.1 22.9  
Crestwood LTIP | Crestwood Holdings          
Related Party Transaction [Line Items]          
Share-based Payment Arrangement, Expense 1.7 0.2 10.9 5.6  
Stagecoach Gas Services LLC          
Related Party Transaction [Line Items]          
Operations and maintenance expenses charged by CEQP and CMLP 1.6 1.9 3.3 3.9  
Tres Palacios Holdings LLC          
Related Party Transaction [Line Items]          
Operations and maintenance expenses charged by CEQP and CMLP 1.1 1.0 2.2 2.2  
Crestwood Permian Basin Holdings LLC          
Related Party Transaction [Line Items]          
Operations and maintenance expenses charged by CEQP and CMLP $ 2.8 $ 3.0 $ 6.2 6.8  
Jackalope Gas Gathering Services, L.L.C.          
Related Party Transaction [Line Items]          
Operations and maintenance expenses charged by CEQP and CMLP       $ 0.5