Inventories - Schedule of Components of Inventories (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Inventories, net:
Manufacturing supplies	$ 45.0	$ 44.0
Raw materials	156.2	147.1
Work in process	508.8	509.6
Finished products	642.6	634.5
Subtotal	1,352.6	1,335.2
Allowance for obsolete and surplus inventory	(78.8)	(91.9)
Total inventories, net	$ 1,273.8	$ 1,243.3

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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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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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 of valuation reserve for inventory.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed 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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