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Equity Method Investments - Schedule of Equity Investments in Affiliates (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 01, 2017
Nov. 30, 2017
Oct. 17, 2017
Dec. 31, 2016
Oct. 03, 2016
Schedule of Equity Method Investments [Line Items]            
Equity method investments $ 362.6       $ 324.7 [1]  
Mars Oil Pipeline Company LLC (“Mars”)            
Schedule of Equity Method Investments [Line Items]            
Ownership interest (in percentage) 71.50%       71.50%  
Equity method investments $ 187.4       $ 191.5  
Bengal Pipeline Company LLC (“Bengal”)            
Schedule of Equity Method Investments [Line Items]            
Ownership interest (in percentage) 50.00%       50.00%  
Equity method investments $ 79.7       $ 76.1  
Permian Basin            
Schedule of Equity Method Investments [Line Items]            
Ownership interest (in percentage) 50.00%       0.00%  
Equity method investments $ 49.4       $ 0.0  
LOCAP            
Schedule of Equity Method Investments [Line Items]            
Ownership interest (in percentage) 41.48%       41.48%  
Equity method investments $ 6.9       $ 4.0  
Poseidon Oil Pipeline Company LLC (“Poseidon”)            
Schedule of Equity Method Investments [Line Items]            
Ownership interest (in percentage) 36.00%       36.00%  
Equity method investments $ 2.3       $ 13.2  
Proteus            
Schedule of Equity Method Investments [Line Items]            
Ownership interest (in percentage) 10.00%       10.00%  
Equity method investments $ 17.4       $ 19.1  
Endymion Oil Pipeline Company, LLC (“Endymion”)            
Schedule of Equity Method Investments [Line Items]            
Ownership interest (in percentage) 10.00%       10.00%  
Equity method investments $ 19.5       $ 20.8  
Mars Oil Pipeline Company LLC (“Mars”)            
Schedule of Equity Method Investments [Line Items]            
Ownership interest (in percentage)   71.50% 48.60%      
Voting interest acquired   22.90%       20.00%
LOCAP            
Schedule of Equity Method Investments [Line Items]            
Voting interest acquired   41.48%        
Permian Basin            
Schedule of Equity Method Investments [Line Items]            
Ownership interest (in percentage) 50.00%          
Voting interest acquired       50.00%    
[1] The financial information presented has been retrospectively adjusted for acquisitions of businesses under common control.