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Stock-Based Compensation Plans - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option compensation			$ 5.9	$ 4.7
Total compensation cost related to non-vested stock options not yet recognized	$ 23.5		$ 23.5
Expected compensation cost recognized over the weighted-average period			1 year 10 months 24 days
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option compensation	2.0	$ 1.5	$ 5.9	4.7
Stock Equivalent Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	$ 2.0	$ 1.8	$ 7.1	$ 15.9

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

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