Inventories, Net - Inventories, Net (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Inventory [Line Items]
Raw materials	$ 127.3	$ 95.8
Work in process	50.8	34.6
Finished products	274.3	320.9
Supplies (chemicals)	69.7	64.5
Total	522.1	515.8
Chemicals
Inventory [Line Items]
Raw materials	124.4	93.1
Work in process	39.0	23.5
Finished products	270.7	317.6
Component Products
Inventory [Line Items]
Raw materials	2.9	2.7
Work in process	11.8	11.1
Finished products	$ 3.6	$ 3.3

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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