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Inventories (Tables)
12 Months Ended
Dec. 31, 2020
Inventory Disclosure [Abstract]  
Summary of Inventory
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