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Inventories (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Inventory, Net [Abstract]    
Raw materials $ 132.9 $ 95.9
Work-in-process 76.1 40.5
Finished goods 43.9 26.9
Operating and other supplies 172.7 127.8
Inventories $ 425.6 $ 291.1