Inventories, Net - Inventories, Net (Detail) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Inventory [Line Items]
Raw materials	$ 138.2	$ 151.5
Work in process	55.6	52.0
Finished products	252.7	355.8
Supplies (chemicals)	86.4	81.5
Total	532.9	640.8
Chemicals
Inventory [Line Items]
Raw materials	132.6	145.3
Work in process	32.6	32.0
Finished products	247.0	350.7
Component products
Inventory [Line Items]
Raw materials	5.6	6.2
Work in process	23.0	20.0
Finished products	$ 5.7	$ 5.1

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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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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