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Revenues (Disaggregation of Revenue) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Disaggregation of Revenue [Line Items]        
Revenue $ 5,797.9 $ 6,194.7 $ 16,460.5 $ 18,079.8
Total petroleum product sales        
Disaggregation of Revenue [Line Items]        
Revenue 4,658.8 5,078.6 13,103.6 14,917.3
Petroleum product sales (at retail)        
Disaggregation of Revenue [Line Items]        
Revenue 4,134.8 4,550.4 11,693.7 13,361.7
Petroleum product sales (at wholesale)        
Disaggregation of Revenue [Line Items]        
Revenue 524.0 528.2 1,409.9 1,555.6
Merchandise sales        
Disaggregation of Revenue [Line Items]        
Revenue 1,055.6 1,027.2 3,070.8 2,913.8
RINs        
Disaggregation of Revenue [Line Items]        
Revenue 81.7 87.6 281.2 243.6
Other revenues        
Disaggregation of Revenue [Line Items]        
Revenue 1.8 1.3 4.9 5.1
Operating Segment | Marketing        
Disaggregation of Revenue [Line Items]        
Revenue 5,797.8 6,194.4 16,460.3 18,079.4
Operating Segment | Marketing | Total petroleum product sales        
Disaggregation of Revenue [Line Items]        
Revenue 4,658.8 5,078.6 13,103.6 14,917.3
Operating Segment | Marketing | Petroleum product sales (at retail)        
Disaggregation of Revenue [Line Items]        
Revenue 4,134.8 4,550.4 11,693.7 13,361.7
Operating Segment | Marketing | Petroleum product sales (at wholesale)        
Disaggregation of Revenue [Line Items]        
Revenue 524.0 528.2 1,409.9 1,555.6
Operating Segment | Marketing | Merchandise sales        
Disaggregation of Revenue [Line Items]        
Revenue 1,055.6 1,027.2 3,070.8 2,913.8
Operating Segment | Marketing | RINs        
Disaggregation of Revenue [Line Items]        
Revenue 81.7 87.6 281.2 243.6
Operating Segment | Marketing | Other revenues        
Disaggregation of Revenue [Line Items]        
Revenue 1.7 1.0 4.7 4.7
Corporate and Other Assets        
Disaggregation of Revenue [Line Items]        
Revenue 0.1 0.3 0.2 0.4
Corporate and Other Assets | Total petroleum product sales        
Disaggregation of Revenue [Line Items]        
Revenue 0.0 0.0 0.0 0.0
Corporate and Other Assets | Petroleum product sales (at retail)        
Disaggregation of Revenue [Line Items]        
Revenue 0.0 0.0 0.0 0.0
Corporate and Other Assets | Petroleum product sales (at wholesale)        
Disaggregation of Revenue [Line Items]        
Revenue 0.0 0.0 0.0 0.0
Corporate and Other Assets | Merchandise sales        
Disaggregation of Revenue [Line Items]        
Revenue 0.0 0.0 0.0 0.0
Corporate and Other Assets | RINs        
Disaggregation of Revenue [Line Items]        
Revenue 0.0 0.0 0.0 0.0
Corporate and Other Assets | Other revenues        
Disaggregation of Revenue [Line Items]        
Revenue $ 0.1 $ 0.3 $ 0.2 $ 0.4