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Inventory - Carrying Value (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Inventory [Line Items]    
Total inventories $ 1,034.6 $ 727.7
Refining    
Inventory [Line Items]    
Refinery raw materials and supplies 528.0 270.7
Refinery work in process 109.4 92.1
Finished goods 363.1 327.1
Logistics    
Inventory [Line Items]    
Finished goods 1.9 3.1
Retail Segment    
Inventory [Line Items]    
Retail fuel 6.7 6.2
Retail merchandise $ 25.5 $ 28.5