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Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Inventory, Net [Abstract]    
Raw materials $ 75.2 $ 101.3
Work-in-process 41.3 44.1
Finished goods 18.4 34.3
Operating and other supplies 132.6 140.9
Total inventories $ 267.5 $ 320.6