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Acquisitions Acquisitions (Details)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 09, 2019
USD ($)
Apr. 30, 2020
USD ($)
Terminals
MMBbls
Apr. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Business Acquisition [Line Items]              
Net proceeds from issuance of non-controlling interest           $ 2.8 $ 235.0
Gain on acquisition       $ 0.0 $ 209.4 $ 0.0 $ 209.4
Crestwood Niobrara LLC              
Business Acquisition [Line Items]              
Net proceeds from issuance of non-controlling interest     $ 235.0        
Percentage of voting rights acquired 100.00%            
Crestwood Niobrara LLC | Williams Partners LP              
Business Acquisition [Line Items]              
Additional voting rights acquired 50.00%            
Percentage of voting rights acquired 100.00%            
Jackalope Gas Gathering Services, L.L.C.              
Business Acquisition [Line Items]              
Ownership percentage     50.00%   50.00%   50.00%
Plains All American Pipeline, L.P.              
Business Acquisition [Line Items]              
Consideration transferred   $ 162.0          
NGL Storage Capacity | MMBbls   7          
Liquid Petroleum Gas Terminals | Terminals   7          
Property plant and equipment   $ 160.0          
Assets and liabilities, net   $ 2.0          
Jackalope Gas Gathering Services, L.L.C.              
Business Acquisition [Line Items]              
Consideration transferred $ 484.6