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Inventories - Schedule of Inventory (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]    
Finished products $ 324.1 $ 319.3
Semi-finished products 106.2 92.2
Raw materials 161.0 127.2
Stores and supplies 23.2 21.2
Total Inventories $ 614.5 $ 559.9