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Investments - Narrative (Details)
$ in Millions
6 Months Ended
Mar. 08, 2019
MMBbls
Feb. 07, 2019
MMBbls
Jun. 30, 2019
USD ($)
White Cliffs      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage     3.33%
Advantage Joint Venture      
Schedule of Equity Method Investments [Line Items]      
Ownership interest, equity method     50.00%
Delaware Crossing Joint Venture      
Schedule of Equity Method Investments [Line Items]      
Ownership interest, equity method     50.00%
Daily capacity (in MBbl/d) | MMBbls   160  
Capital contributions     $ 38.3
EPIC Y-Grade      
Schedule of Equity Method Investments [Line Items]      
Ownership interest, equity method     15.00%
Capital contributions     $ 149.5
EPIC Crude      
Schedule of Equity Method Investments [Line Items]      
Ownership interest, equity method     30.00%
Daily capacity (in MBbl/d) | MMBbls 590    
Capital contributions     $ 216.2