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Inventories
9 Months Ended
Sep. 30, 2021
Inventory, Net [Abstract]  
Inventories Inventories
Inventories consist of the following:
September 30, 2021
December 31, 2020
Raw materials$95.3 $95.9 
Work-in-process55.4 40.5 
Finished goods26.4 26.9 
Operating and other supplies166.2 127.8 
Total inventories$343.3 $291.1 
Inventories are stated at the lower of cost or Net Realizable Value ("NRV") using the first-in, first-out or the weighted average cost method.