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Inventories - Schedule of Components of Inventories (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Inventories, net:
Manufacturing supplies	$ 44.9	$ 42.8
Raw materials	134.0	155.2
Work in process	507.4	476.0
Finished products	632.8	595.0
Subtotal	1,319.1	1,269.0
Allowance for obsolete and surplus inventory	(93.2)	(73.4)
Total inventories, net	$ 1,225.9	$ 1,195.6

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of other supplies used within the manufacturing or production process expected to be consumed within one year or operating cycle, if longer.

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