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Property, Plant and Equipment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Cost $ 3,059.0 $ 2,886.5  
Net 1,867.6 1,807.3  
Depreciation expense 160.0 151.2 $ 132.5
Land      
Property, Plant and Equipment [Line Items]      
Cost 609.5 598.6  
Net 609.5 598.6  
Pipeline and terminal facilities      
Property, Plant and Equipment [Line Items]      
Cost 79.8 77.5  
Net 43.5 43.7  
Retail gasoline stations      
Property, Plant and Equipment [Line Items]      
Cost 2,179.7 2,034.4  
Net 1,123.2 1,073.6  
Buildings      
Property, Plant and Equipment [Line Items]      
Cost 66.7 60.5  
Net 48.5 44.9  
Other      
Property, Plant and Equipment [Line Items]      
Cost 123.3 115.5  
Net $ 42.9 $ 46.5  
Minimum | Pipeline and terminal facilities      
Property, Plant and Equipment [Line Items]      
Estimated useful life (in years) 16 years    
Minimum | Retail gasoline stations      
Property, Plant and Equipment [Line Items]      
Estimated useful life (in years) 3 years    
Minimum | Buildings      
Property, Plant and Equipment [Line Items]      
Estimated useful life (in years) 20 years    
Minimum | Other      
Property, Plant and Equipment [Line Items]      
Estimated useful life (in years) 3 years    
Maximum | Pipeline and terminal facilities      
Property, Plant and Equipment [Line Items]      
Estimated useful life (in years) 25 years    
Maximum | Retail gasoline stations      
Property, Plant and Equipment [Line Items]      
Estimated useful life (in years) 50 years    
Maximum | Buildings      
Property, Plant and Equipment [Line Items]      
Estimated useful life (in years) 45 years    
Maximum | Other      
Property, Plant and Equipment [Line Items]      
Estimated useful life (in years) 20 years