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Share-Based Plans - Narrative (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized (in shares)	21,400,000
Number of common shares available for grant (in shares)	3,300,000
Award vesting percentage	50.00%
Income tax benefit	$ 12.8	$ 13.9	$ 12.0
Fair value of restricted stock awards	49.7	39.9	51.7
Unrecognized stock compensation expense	$ 41.1
Unrecognized stock compensation expense, recognition period (in years)	1 year 9 months 18 days
Weighted-average remaining contractual life	10 months 24 days
Aggregate intrinsic value	$ 0.1
Total intrinsic value of options exercised	0.3	2.2	1.0
Exercise of stock options	0.3	1.8	0.7
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 55.1	$ 54.5	$ 55.1
Incentive Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual life (in years)	ten
Number of options outstanding (in shares)	2,114
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	1 year
Minimum | Performance-Based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage	0.00%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	3 years
Maximum | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common shares available for grant (in shares)	300,000
Maximum | Performance-Based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage	150.00%

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