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Inventories (Summary Of Inventory) (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Finished products - First-In, First-Out ("FIFO") basis $ 188.8 $ 259.2
Less: Last-In, First-Out ("LIFO") reserve - finished products (80.1) (160.8)
Finished products - LIFO basis 108.7 98.4
Store merchandise for resale 142.7 123.0
Materials and supplies 6.3 6.2
Total inventories $ 257.7 $ 227.6