Discontinued Operations - Additional Information (Detail) - Evonik [Member] $ in Millions	12 Months Ended
Dec. 31, 2020 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Asset purchase agreement subject to certain adjustments paid	$ 15.0
Gain from discontinued operations	$ 12.8

Amount after tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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