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Revenues (Disaggregation of Revenue) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Disaggregation of Revenue [Line Items]        
Total revenues $ 3,788.0 $ 3,236.3 $ 10,861.2 $ 9,447.0
Petroleum product sales (at retail)        
Disaggregation of Revenue [Line Items]        
Total revenues 2,770.1 2,281.9 7,910.6 6,684.0
Petroleum product sales (at wholesale)        
Disaggregation of Revenue [Line Items]        
Total revenues 381.4 299.0 1,072.2 866.9
Total petroleum product sales        
Disaggregation of Revenue [Line Items]        
Total revenues 3,151.5 2,580.9 8,982.8 7,550.9
Merchandise sales        
Disaggregation of Revenue [Line Items]        
Total revenues 623.7 605.6 1,807.5 1,777.1
RINs        
Disaggregation of Revenue [Line Items]        
Total revenues 11.6 48.7 67.3 114.4
Other revenues        
Disaggregation of Revenue [Line Items]        
Total revenues 1.2 1.1 3.6 4.6
Operating Segments | Marketing        
Disaggregation of Revenue [Line Items]        
Total revenues 3,788.0 3,236.3 10,860.7 9,446.8
Operating Segments | Marketing | Petroleum product sales (at retail)        
Disaggregation of Revenue [Line Items]        
Total revenues 2,770.1 2,281.9 7,910.6 6,684.0
Operating Segments | Marketing | Petroleum product sales (at wholesale)        
Disaggregation of Revenue [Line Items]        
Total revenues 381.4 299.0 1,072.2 866.9
Operating Segments | Marketing | Total petroleum product sales        
Disaggregation of Revenue [Line Items]        
Total revenues 3,151.5 2,580.9 8,982.8 7,550.9
Operating Segments | Marketing | Merchandise sales        
Disaggregation of Revenue [Line Items]        
Total revenues 623.7 605.6 1,807.5 1,777.1
Operating Segments | Marketing | RINs        
Disaggregation of Revenue [Line Items]        
Total revenues 11.6 48.7 67.3 114.4
Operating Segments | Marketing | Other revenues        
Disaggregation of Revenue [Line Items]        
Total revenues 1.2 1.1 3.1 4.4
Corporate and other assets        
Disaggregation of Revenue [Line Items]        
Total revenues 0.0 0.0 0.5 0.2
Corporate and other assets | Petroleum product sales (at retail)        
Disaggregation of Revenue [Line Items]        
Total revenues 0.0 0.0 0.0 0.0
Corporate and other assets | Petroleum product sales (at wholesale)        
Disaggregation of Revenue [Line Items]        
Total revenues 0.0 0.0 0.0 0.0
Corporate and other assets | Total petroleum product sales        
Disaggregation of Revenue [Line Items]        
Total revenues 0.0 0.0 0.0 0.0
Corporate and other assets | Merchandise sales        
Disaggregation of Revenue [Line Items]        
Total revenues 0.0 0.0 0.0 0.0
Corporate and other assets | RINs        
Disaggregation of Revenue [Line Items]        
Total revenues 0.0 0.0 0.0 0.0
Corporate and other assets | Other revenues        
Disaggregation of Revenue [Line Items]        
Total revenues $ 0.0 $ 0.0 $ 0.5 $ 0.2