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Inventories - Schedule of Inventory (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Inventory Disclosure [Abstract] |  |
Manufacturing supplies | $ 61.1 | $ 57.5
Raw materials | 25.3 | 13.6
Work in process | 122.5 | 114.5
Finished products | 29.9 | 35.3
Gross inventory | 238.8 | 220.9
Allowance for inventory reserves | (1.3) | (1.1)
Total inventories, net | $ 237.5 | $ 219.8

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