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Inventories
12 Months Ended
Dec. 31, 2020
Inventory Disclosure [Abstract]  
Inventories Inventories
 
Inventories consisted of the following:
 December 31,
(Millions of dollars)20202019
Finished products - FIFO basis$223.0 $259.2 
Less LIFO reserve - finished products(101.3)(160.8)
Finished products - LIFO basis121.7 98.4 
Store merchandise for resale152.0 123.0 
Materials and supplies5.4 6.2 
Total inventories$279.1 $227.6 
 
At December 31, 2020 and 2019, the replacement cost (market value) of last-in, first-out (LIFO) inventories exceeded the LIFO carrying value by $101.3 million and $160.8 million, respectively.