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Inventories - Schedule of Components of Inventories (Details) - USD ($) $ in Millions | Jun. 30, 2026 | Dec. 31, 2025
--- | --- | ---
Inventories, net: |  |
Manufacturing supplies | $ 47.4 | $ 44.0
Raw materials | 159.3 | 147.1
Work in process | 515.8 | 509.6
Finished products | 617.8 | 634.5
Subtotal | 1,340.3 | 1,335.2
Allowance for obsolete and surplus inventory | (91.2) | (91.9)
Total inventories, net | $ 1,249.1 | $ 1,243.3

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