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Acquisitions and Divestiture - 2018 Acquisitions (Details) - USD ($)
$ in Millions
May 11, 2018
Dec. 01, 2017
Amberjack Pipeline Company LLC - Series A    
Business Acquisition [Line Items]    
Voting interest acquired   75.00%
Amberjack Pipeline Company LLC - Series B    
Business Acquisition [Line Items]    
Voting interest acquired 50.00%  
May 2018 Acquisition    
Business Acquisition [Line Items]    
Consideration transferred $ 1,220.0  
Equity method investment, aggregate cost 481.6  
Business combination capital distribution to general partner 738.4  
May 2018 Acquisition | Five Year Revolver due December 2022    
Business Acquisition [Line Items]    
Consideration transferred 726.0  
May 2018 Acquisition | Five Year Revolver Due July 2023    
Business Acquisition [Line Items]    
Consideration transferred $ 494.0