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Stock-Based Compensation Plans - Summary of Transactions of the Company's Share Based Compensation (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Compensation cost	$ 1.6	$ 2.9	$ 6.2	$ 11.2
Employee Stock Option
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Compensation cost	0.9	2.2	5.0	6.4
Stock Equivalent Units [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Compensation cost	$ 0.7	$ 0.7	$ 1.2	$ 4.8

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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