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Inventories (Summary Of Inventory) (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]    
Finished products - First-In, First-Out ("FIFO") basis $ 300.0 $ 223.0
Less: Last-In, First-Out ("LIFO") reserve - finished products (192.2) (101.3)
Finished products - LIFO basis 107.8 121.7
Store merchandise for resale 169.0 152.0
Materials and supplies 6.2 5.4
Total inventories $ 283.0 $ 279.1