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Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Inventory, Net [Abstract]    
Raw materials $ 81.8 $ 101.3
Work-in-process 32.2 44.1
Finished goods 26.1 34.3
Operating and other supplies 134.9 140.9
Total inventories $ 275.0 $ 320.6