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Inventories, Net (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Inventory [Line Items]                      
Inventories at FIFO, net of reserves $ 875.6       $ 866.1       $ 875.6 $ 866.1  
Less: LIFO reserve (204.7)       (177.1)       (204.7) (177.1)  
Total inventories, net of reserves 670.9       689.0       670.9 689.0  
LIFO expense 5.9 $ 7.3 $ 7.4 $ 7.0 5.2 $ 7.2 $ 6.9 $ 5.9 27.6 25.2 $ 21.5
LIFO decrement                 20.3 30.7  
Reduction in LIFO expense                 2.8 3.9  
United States                      
Inventory [Line Items]                      
Less: LIFO reserve $ (204.7)       $ (177.1)       $ (204.7) $ (177.1)