Inventories, Net - Inventories, Net (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Inventory [Line Items]
Raw materials	$ 132.4	$ 81.3
Work in process	47.2	47.2
Finished products	291.7	250.2
Supplies (chemicals)	74.5	80.0
Total	545.8	458.7
Chemicals
Inventory [Line Items]
Raw materials	125.0	76.3
Work in process	25.8	30.4
Finished products	287.2	246.4
Component Products
Inventory [Line Items]
Raw materials	7.4	5.0
Work in process	21.4	16.8
Finished products	$ 4.5	$ 3.8

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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