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Stock-Based Compensation Plans - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option compensation			$ 3.9	$ 3.2
Total compensation cost related to non-vested stock options not yet recognized	$ 27.9		$ 27.9
Expected compensation cost recognized over the weighted-average period			2 years
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option compensation	2.0	$ 1.5	$ 3.9	3.2
Stock Equivalent Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	$ 1.9	$ 7.0	$ 5.1	$ 14.1

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

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