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Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Inventory, Net [Abstract]    
Raw materials $ 100.3 $ 100.8
Work-in-process 51.5 49.5
Finished goods 33.8 47.3
Operating and other supplies 153.6 146.2
Total inventories $ 339.2 $ 343.8