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Investments in Unconsolidated Entities - Equity Method Investments (Details) - USD ($)
shares in Millions, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended 22 Months Ended
Apr. 03, 2017
Jan. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Nov. 14, 2016
Aug. 31, 2016
Jun. 30, 2016
Investments in Unconsolidated Entities                    
Investments in unconsolidated entities         $ 2,702.0 $ 2,756.0 $ 2,343.0      
Gain on sale of investment in unconsolidated entities         200.0 0.0 0.0      
Value of units contributed           40.0        
Limited partner interest               98.00%    
Return of investment from unconsolidated entities         10.0 21.0        
Capital contributions to equity method investees excluding capitalized interest         459.0 398.0 288.0      
Capitalized interest related to contributions to unconsolidated entities         30.0 35.0 47.0      
Amount by which investments in unconsolidated entities exceeded our share of the underlying equity in the net assets         $ 467.0 736.0        
Advantage Pipeline Holdings LLC (“Advantage Joint Venture”)                    
Investments in Unconsolidated Entities                    
Ownership interest 50.00%       50.00%          
Investments in unconsolidated entities $ 66.5       $ 72.0 69.0        
Payments to acquire investments 26.0                  
BridgeTex Pipeline Company, LLC (“BridgeTex”)                    
Investments in Unconsolidated Entities                    
Ownership interest     20.00%   20.00%          
Investments in unconsolidated entities         $ 435.0 1,093.0        
Proceeds from sale of equity investments     $ 868.0              
Ownership percentage sold     30.00%   30.00%          
Gain on sale of investment in unconsolidated entities         $ 200.0          
Cactus II Pipeline LLC (“Cactus II”)                    
Investments in Unconsolidated Entities                    
Ownership interest         65.00%          
Investments in unconsolidated entities         $ 455.0 0.0        
Property and equipment disposals       $ 74.0            
Proceeds from sale of equity investments       $ 26.0            
Caddo Pipeline LLC                    
Investments in Unconsolidated Entities                    
Ownership interest         50.00%          
Investments in unconsolidated entities         $ 65.0 67.0        
Cheyenne Pipeline LLC (“Cheyenne”)                    
Investments in Unconsolidated Entities                    
Ownership interest         50.00%          
Investments in unconsolidated entities         $ 44.0 29.0        
Ownership percentage sold                   50.00%
Diamond Pipeline LLC (“Diamond”)                    
Investments in Unconsolidated Entities                    
Ownership interest         50.00%          
Investments in unconsolidated entities         $ 479.0 467.0        
Eagle Ford Pipeline LLC (“Eagle Ford Pipeline”)                    
Investments in Unconsolidated Entities                    
Ownership interest         50.00%          
Investments in unconsolidated entities         $ 383.0 378.0        
Eagle Ford Terminals Corpus Christi LLC (“Eagle Ford Terminals”)                    
Investments in Unconsolidated Entities                    
Ownership interest         50.00%          
Investments in unconsolidated entities         $ 108.0 75.0        
Midway Pipeline LLC                    
Investments in Unconsolidated Entities                    
Ownership interest         50.00%          
Investments in unconsolidated entities         $ 78.0 20.0        
Saddlehorn Pipeline Company, LLC                    
Investments in Unconsolidated Entities                    
Ownership interest         40.00%          
Investments in unconsolidated entities         $ 215.0 217.0        
Settoon Towing, LLC                    
Investments in Unconsolidated Entities                    
Ownership interest         50.00%          
Investments in unconsolidated entities         $ 58.0 69.0        
Return of investment from unconsolidated entities           21.0        
STACK Pipeline LLC (“STACK”)                    
Investments in Unconsolidated Entities                    
Ownership interest         50.00%          
Investments in unconsolidated entities         $ 120.0 73.0        
Ownership percentage sold                 50.00%  
White Cliffs Pipeline, LLC                    
Investments in Unconsolidated Entities                    
Ownership interest         36.00%          
Investments in unconsolidated entities         $ 190.0 199.0        
Oxy | Cactus II Pipeline LLC (“Cactus II”)                    
Investments in Unconsolidated Entities                    
Interest acquired       20.00%            
Equity Method Investees                    
Investments in Unconsolidated Entities                    
Capitalized interest related to contributions to unconsolidated entities         $ 9.0 $ 18.0 $ 13.0      
Third Party | Cactus II Pipeline LLC (“Cactus II”)                    
Investments in Unconsolidated Entities                    
Interest acquired       15.00%            
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                  
Other long-term liabilities and deferred credits | Cactus II Pipeline LLC (“Cactus II”)                    
Investments in Unconsolidated Entities                    
Advanced cash payment       $ 100.0            
Capline pipeline system                    
Investments in Unconsolidated Entities                    
Undivided Joint Interest Ownership Percentage         54.00%          
Subsequent Event | Wink to Webster Pipeline LLC                    
Investments in Unconsolidated Entities                    
Limited partner interest   20.00%