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Inventories - Schedule of Inventory (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Inventory Disclosure [Abstract]    
Manufacturing supplies $ 57.5 $ 51.5
Raw materials 13.6 17.5
Work in process 114.5 109.6
Finished products 35.3 50.1
Gross inventory 220.9 228.7
Allowance for inventory reserves (1.1) (0.7)
Total inventories, net $ 219.8 $ 228.0