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Inventories, net (Detail) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Inventories, net [Line Items]
Raw materials	$ 133.1	$ 194.0
Work in process	58.4	49.9
Finished products	260.7	256.3
Supplies (chemicals)	125.2	95.9
Total	577.4	596.1
Chemicals
Inventories, net [Line Items]
Raw materials	127.4	188.3
Work in process	41.0	30.8
Finished products	255.8	250.4
Component products
Inventories, net [Line Items]
Raw materials	5.7	5.7
Work in process	17.4	19.1
Finished products	$ 4.9	$ 5.9

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process.

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