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Inventories (Summary Of Inventory) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Finished products - First-In, First-Out (FIFO) basis $ 319.8 $ 231.9
Less: Last-In, First-Out (LIFO) reserve - finished products (208.6) (167.2)
Finished products - LIFO basis 111.2 64.7
Store merchandise for resale 98.0 104.8
Materials and supplies 5.9 13.0
Total inventories $ 215.1 $ 182.5