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Partners' Capital Rollforward of non-controlling interest (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 30, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Increase (Decrease) in Temporary Equity [Roll Forward]                
Temporary Equity, Net Income         $ 30.4 $ 20.5    
Interest of non-controlling partner in subsidiary   $ 425.1     431.6 425.1 $ 426.2 $ 0.0
Non-controlling interest reclassification (Note 10)           178.8    
Net proceeds from issuance of non-controlling interest         2.8 235.0    
Crestwood Niobrara LLC                
Increase (Decrease) in Temporary Equity [Roll Forward]                
Net proceeds from issuance of non-controlling interest $ 235.0              
Non-Controlling Partners                
Increase (Decrease) in Temporary Equity [Roll Forward]                
Partners' Capital Account, Distributions   $ 0.0 $ (3.3) $ (3.3)        
Non-controlling interest reclassification (Note 10)     $ (178.8)          
Non-Controlling Partners                
Increase (Decrease) in Temporary Equity [Roll Forward]                
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders         (27.8) (9.2)    
Net proceeds from issuance of non-controlling interest         $ 2.8      
Series A-3                
Increase (Decrease) in Temporary Equity [Roll Forward]                
Net proceeds from issuance of non-controlling interest $ 235.0         $ 235.0