v3.26.1
Inventories
6 Months Ended
Jun. 30, 2026
Inventory, Net [Abstract]  
Inventories
9.    Inventories
Inventories consist of the following:
June 30, 2026December 31, 2025
Raw materials$191.0 $161.5 
Work-in-process67.5 52.2 
Finished goods58.6 36.5 
Operating and other supplies265.8 269.4 
Total inventories$582.9 $519.6 
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.