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Inventories - Schedule of Inventory (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Inventory Disclosure [Abstract]
Manufacturing supplies	$ 59.3	$ 57.5
Raw materials	28.9	13.6
Work in process	105.9	114.5
Finished products	37.6	35.3
Gross inventory	231.7	220.9
Allowance for inventory reserves	(1.1)	(1.1)
Total inventories, net	$ 230.6	$ 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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