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Inventories, Net (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Inventory [Line Items]                      
Inventories at FIFO, net of reserves $ 993.9       $ 875.6       $ 993.9 $ 875.6  
Less: LIFO reserve (235.4)       (204.7)       (235.4) (204.7)  
Total inventories, net of reserves 758.5       670.9       758.5 670.9  
LIFO expense 9.2 $ 5.4 $ 8.3 $ 7.8 5.9 $ 7.3 $ 7.4 $ 7.0 30.7 27.6 $ 25.2
LIFO decrement                 20.1 20.3  
Reduction in LIFO expense                 0.7 2.8  
United States                      
Inventory [Line Items]                      
Less: LIFO reserve $ (235.4)       $ (204.7)       $ (235.4) $ (204.7)