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Investments in Unconsolidated Entities - Equity Method Investments (Details) - USD ($)
shares in Millions, $ in Millions
1 Months Ended 12 Months Ended
Apr. 03, 2017
Aug. 31, 2016
Jun. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Investments in Unconsolidated Entities            
Investments in unconsolidated entities       $ 2,756.0 $ 2,343.0 $ 2,027.0
Value of units contributed       40.0    
Return of investment from unconsolidated entities       21.0    
Capital contributions to equity method investees excluding capitalized interest       398.0 288.0 245.0
Return of cash contributions       6.0   53.0
Capitalized interest related to contributions to unconsolidated entities       35.0 47.0 57.0
Amount by which investments in unconsolidated entities exceeded our share of the underlying equity in the net assets       $ 736.0 758.0  
Advantage Pipeline Holdings LLC (“Advantage Joint Venture”)            
Investments in Unconsolidated Entities            
Ownership interest 50.00%     50.00%    
Investments in unconsolidated entities $ 66.5     $ 69.0 0.0  
Payments to acquire investments 26.0          
BridgeTex Pipeline Company, LLC (“BridgeTex”)            
Investments in Unconsolidated Entities            
Ownership interest       50.00%    
Investments in unconsolidated entities       $ 1,093.0 1,098.0  
Butte Pipe Line Company            
Investments in Unconsolidated Entities            
Investments in unconsolidated entities       $ 0.0 11.0  
Caddo Pipeline LLC            
Investments in Unconsolidated Entities            
Ownership interest       50.00%    
Investments in unconsolidated entities       $ 67.0 65.0  
Cheyenne Pipeline LLC (“Cheyenne”)            
Investments in Unconsolidated Entities            
Ownership interest       50.00%    
Investments in unconsolidated entities       $ 29.0 30.0  
Ownership percentage sold     50.00%      
Diamond Pipeline LLC (“Diamond”)            
Investments in Unconsolidated Entities            
Ownership interest       50.00%    
Investments in unconsolidated entities       $ 467.0 143.0  
Eagle Ford Pipeline LLC (“Eagle Ford Pipeline”)            
Investments in Unconsolidated Entities            
Ownership interest       50.00%    
Investments in unconsolidated entities       $ 378.0 372.0  
Eagle Ford Terminals Corpus Christi LLC (“Eagle Ford Terminals”)            
Investments in Unconsolidated Entities            
Ownership interest       50.00%    
Investments in unconsolidated entities       $ 75.0 53.0  
Frontier Aspen LLC            
Investments in Unconsolidated Entities            
Investments in unconsolidated entities       $ 0.0 45.0  
Midway Pipeline LLC            
Investments in Unconsolidated Entities            
Ownership interest       50.00%    
Investments in unconsolidated entities       $ 20.0 0.0  
Saddlehorn Pipeline Company, LLC            
Investments in Unconsolidated Entities            
Ownership interest       40.00%    
Investments in unconsolidated entities       $ 217.0 213.0  
Settoon, Towing LLC            
Investments in Unconsolidated Entities            
Ownership interest       50.00%    
Investments in unconsolidated entities       $ 69.0 87.0  
Return of investment from unconsolidated entities       $ 21.0    
STACK Pipeline LLC (“STACK”)            
Investments in Unconsolidated Entities            
Ownership interest       50.00%    
Investments in unconsolidated entities       $ 73.0 14.0  
Ownership percentage sold   50.00%        
White Cliffs Pipeline, LLC            
Investments in Unconsolidated Entities            
Ownership interest       36.00%    
Investments in unconsolidated entities       $ 199.0 212.0  
Equity Method Investees            
Investments in Unconsolidated Entities            
Capitalized interest related to contributions to unconsolidated entities       $ 18.0 $ 13.0 $ 8.0
Advantage Joint Venture | Advantage Pipeline Holdings LLC (“Advantage Joint Venture”)            
Investments in Unconsolidated Entities            
Purchase price $ 133.0          
Common Units | Advantage Pipeline Holdings LLC (“Advantage Joint Venture”)            
Investments in Unconsolidated Entities            
Units contributed 1.3          
Value of units contributed $ 40.0