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Inventories (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]      
Percentage of total inventories on LIFO 72.00% 72.00% 71.00%
Excess of FIFO over LIFO $ 339.8 $ 377.1 $ 288.2
Reserve for obsolescence $ 115.4 $ 105.9 $ 103.7