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Goodwill - Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Line Items]
Goodwill	$ 379.7	$ 379.7	$ 379.7
Chemicals
Goodwill [Line Items]
Goodwill	352.6	352.6	352.6
Component Products [Member]
Goodwill [Line Items]
Goodwill	$ 27.1	$ 27.1	$ 27.1

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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