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Inventories (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Inventory, Net [Abstract]    
Raw materials $ 101.3 $ 100.8
Work-in-process 44.1 49.5
Finished goods 34.3 47.3
Operating and other supplies 140.9 146.2
Inventories $ 320.6 $ 343.8