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Significant Accounting Policies (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Excise taxes $ 1,760.0 $ 1,933.3 $ 1,838.9
Interest costs capitalized $ 1.4 $ 1.4 $ 2.2
LKE transaction, required term to facilitate forward agreement before proceeds are reclassified as available cash (in days) 180 days    
Pipeline and terminal facilities | Minimum      
Property, Plant and Equipment [Line Items]      
Depreciable life (in years) 16 years    
Pipeline and terminal facilities | Maximum      
Property, Plant and Equipment [Line Items]      
Depreciable life (in years) 25 years    
Retail gasoline stations | Minimum      
Property, Plant and Equipment [Line Items]      
Depreciable life (in years) 3 years    
Retail gasoline stations | Maximum      
Property, Plant and Equipment [Line Items]      
Depreciable life (in years) 50 years    
Nonqualified Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period (in years) 3 years    
Restricted Stock And Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period (in years) 3 years