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Stock-Based Compensation Plans - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Mar. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option compensation			$ 6.4	$ 5.9
Maximum percentage of stock options granted					130.00%
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
Stock Options Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option compensation	2.2	$ 2.0	$ 6.4	0.9
Stock Equivalent Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	$ 0.7	$ 2.0	$ 4.8	$ 7.1

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