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Inventories
9 Months Ended
Sep. 30, 2023
Inventory Disclosure [Abstract]  
Inventories 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 
 
Murphy USA and Murphy Express branded petroleum products are valued using the last-in, first-out (LIFO) method and certain QuickChek store merchandise for resale is valued using the LIFO method. At September 30, 2023 and December 31, 2022, the replacement cost (market value) of LIFO inventories exceeded the LIFO carrying value for petroleum products by $311.6 million and $249.1 million, respectively and for store merchandise for resale by $2.1 million and $1.6 million for September 30, 2023 and December 31, 2022, respectively.