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Partners' Capital Rollforward of non-controlling interest (Details) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended
Oct. 31, 2021
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Increase (Decrease) in Temporary Equity [Roll Forward]          
Temporary Equity, Net Income   $ 30.7 $ 30.4    
Interest of non-controlling partner in subsidiary   434.5 431.6 $ 432.7 $ 426.2
Net proceeds from issuance of non-controlling interest   1.0 2.8    
Subsequent Event | Crestwood Niobrara LLC          
Increase (Decrease) in Temporary Equity [Roll Forward]          
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders $ (10.3)        
Non-Controlling Partners          
Increase (Decrease) in Temporary Equity [Roll Forward]          
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders   (29.9) (27.8)    
Net proceeds from issuance of non-controlling interest   $ 1.0 $ 2.8