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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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