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Inventories, Net (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Inventory [Line Items]      
Inventories at FIFO, net of reserves $ 970.6   $ 875.6
Less: LIFO reserve (212.5)   (204.7)
Total inventories, net of reserves 758.1   670.9
LIFO expense 7.8 $ 7.0  
United States      
Inventory [Line Items]      
Less: LIFO reserve $ (212.5)   $ (204.7)