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Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Inventory, Net [Abstract]    
Raw materials $ 88.4 $ 100.7
Work-in-process 50.7 49.5
Finished goods 36.2 47.3
Operating and other supplies 147.0 146.3
Total inventories $ 322.3 $ 343.8