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Inventories - Schedule of Inventory (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
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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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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