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Inventories (Tables)
9 Months Ended
Sep. 30, 2023
Inventory Disclosure [Abstract]  
Schedule of Inventories Inventories consisted of the following:
(Millions of dollars)September 30,
2023
December 31,
2022
Petroleum products - FIFO basis$430.5 $367.0 
Store merchandise for resale - FIFO basis203.6 192.1 
Less LIFO reserve(313.7)(250.7)
Total petroleum products and store merchandise inventory320.4 308.4 
Materials and supplies15.0 10.7 
Total inventories$335.4 $319.1