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Acquisitions and Divestiture - 2017 Acquisitions and Divestiture - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 8 Months Ended 12 Months Ended
Dec. 01, 2017
Oct. 17, 2017
May 10, 2017
Apr. 28, 2017
Dec. 31, 2017
May 31, 2017
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Oct. 03, 2016
Aug. 09, 2016
Business Acquisition [Line Items]                        
Divestiture cash consideration               $ 0.0 $ 0.8 $ 0.0    
Excess proceeds from divestiture from Parent                 $ 20.2      
Shell Oil Products US (SOPUS)                        
Business Acquisition [Line Items]                        
Voting interest acquired 100.00%                      
LOCAP LLC (“LOCAP”)                        
Business Acquisition [Line Items]                        
Voting interest acquired 41.48%                      
Mars Oil Pipeline Company LLC (“Mars”)                        
Business Acquisition [Line Items]                        
Voting interest acquired 22.90%                   20.00%  
Odyssey Pipeline L.L.C. (“Odyssey”)                        
Business Acquisition [Line Items]                        
Voting interest acquired 22.00%                      
Explorer                        
Business Acquisition [Line Items]                        
Voting interest acquired 10.00%                     2.62%
December 2017 Acquisition                        
Business Acquisition [Line Items]                        
Consideration transferred $ 825.0                      
Transaction costs 0.6                      
Contribution in excess of book value of net assets acquired $ 605.2                      
Revenue related to acquisition         $ 7.7              
Net earnings related to acquisition         $ 18.8              
Crestwood Permian Basin LLC (“Permian Basin”)                        
Business Acquisition [Line Items]                        
Voting interest acquired   50.00%                    
Consideration transferred   $ 49.9                    
May 2017 Acquisition                        
Business Acquisition [Line Items]                        
Voting interest acquired     100.00%                  
Consideration transferred     $ 630.0                  
Transaction costs     0.8                  
Contribution in excess of book value of net assets acquired     429.3                  
Revenue related to acquisition             $ 63.8          
Net earnings related to acquisition             $ 29.3          
Consideration, cash on hand     50.0                  
Shutdown period           2 years            
Revolving Credit Facility | Shell Treasury Center West Inc | Five Year Revolver | May 2017 Acquisition                        
Business Acquisition [Line Items]                        
Consideration, funded with borrowings     73.1                  
Line of Credit | Five Year Fixed Facility | May 2017 Acquisition                        
Business Acquisition [Line Items]                        
Consideration, funded with borrowings     506.9                  
Line of Credit | Shell Treasury Center West Inc | Five Year Fixed Facility | May 2017 Acquisition                        
Business Acquisition [Line Items]                        
Consideration, funded with borrowings     $ 506.9                  
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Zydeco                        
Business Acquisition [Line Items]                        
Divestiture cash consideration       $ 21.0                
Book value of net assets divested       0.8                
Excess proceeds from divestiture from Parent       20.2                
Shell Pipeline Company L P | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Zydeco                        
Business Acquisition [Line Items]                        
Divestiture cash consideration       $ 19.4