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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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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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