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Inventories - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Percentage of inventories valued by LIFO method 41.00%  
Inventory, LIFO Reserve $ 168.9 $ 173.9
Percentage of inventories valued by FIFO method 59.00%  
Inventory, LIFO Reserve, Period Charge $ 5.0 $ (6.2)