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Partners' Capital Rollforward of non-controlling interest (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Increase (Decrease) in Temporary Equity [Roll Forward]              
Temporary Equity, Net Income       $ 20.1 $ 10.6    
Interest of non-controlling partner in subsidiary   $ 424.4   430.6 424.4 $ 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   (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       (18.5)      
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