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Inventories - Schedule of Inventory (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Inventory Disclosure [Abstract]    
Manufacturing supplies $ 31.2 $ 29.3
Raw materials 41.0 37.3
Work in process 138.5 89.3
Finished products 51.6 55.8
Gross inventory 262.3 211.7
Allowance for inventory reserves (0.5) (0.8)
Total inventories, net $ 261.8 $ 210.9