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Inventories
3 Months Ended
Mar. 31, 2025
Inventory, Net [Abstract]  
Inventories
8.    Inventories
Inventories consist of the following:
March 31, 2025December 31, 2024
Raw materials$153.3 $180.8 
Work-in-process57.4 52.1 
Finished goods87.6 74.6 
Operating and other supplies243.9 231.5 
Total inventories$542.2 $539.0 
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.