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Acquisitions and Divestitures - Book Value of Assets Acquired (Details) - USD ($)
$ in Millions
May 23, 2016
May 10, 2017
Delta    
Business Acquisition [Line Items]    
Book value of assets acquired   $ 40.1
Interest acquired   100.00%
Na Kika    
Business Acquisition [Line Items]    
Book value of assets acquired   $ 26.0
Interest acquired   100.00%
Refinery Gas Pipeline    
Business Acquisition [Line Items]    
Book value of assets acquired   $ 134.6
Interest acquired   100.00%
May 2017 Acquisition    
Business Acquisition [Line Items]    
Book value of assets acquired   $ 200.7
May 2016 Acquisition    
Business Acquisition [Line Items]    
Book value of assets acquired $ 93.7  
Cost investment 5.2  
Equity method investments 1.5  
Partner's capital $ 87.0  
Colonial Pipeline Company (“Colonial”)    
Business Acquisition [Line Items]    
Interest acquired 3.00%  
Bengal    
Business Acquisition [Line Items]    
Interest acquired 1.00%  
Zydeco Pipeline Company LLC (“Zydeco”)    
Business Acquisition [Line Items]    
Interest acquired 30.00%