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Inventories
9 Months Ended
Sep. 30, 2020
Inventory, Net [Abstract]  
Inventories Inventories
Inventories consist of the following:
September 30, 2020
December 31, 2019
Raw materials$75.2 $101.3 
Work-in-process41.3 44.1 
Finished goods18.4 34.3 
Operating and other supplies132.6 140.9 
Total inventories$267.5 $320.6 
Inventories are stated at the lower of cost or Net Realizable Value ("NRV") using the first-in, first-out ("FIFO") or the weighted average cost method.