XML 81 R70.htm IDEA: XBRL DOCUMENT v3.24.0.1
Stock-Based Compensation Plans - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Jan. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense related to share-based compensation plans   $ 21.2 $ 20.6 $ 20.1
Compensation expense related to share-based compensation plans, net of tax   $ 17.0 $ 15.7 $ 14.9
Time Based Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock grants   384,394 429,344 1,069,160
Restricted stock grants, Weighted average grant date fair value   $ 37.53 $ 41.46 $ 33.01
Unrecognized compensation cost related to non-vested share-based compensation   $ 34.0 $ 41.3 $ 45.5
Unrecognized compensation cost weighted average period recognized (years)   2 years 9 months 2 years 8 months 1 day 3 years 1 month 9 days
Time Based Restricted Stock [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock vesting period   1 year 1 year 1 year
Time Based Restricted Stock [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock vesting period   5 years 5 years 5 years
Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense related to share-based compensation plans   $ 6.3 $ 5.6 $ 5.8
Compensation expense related to share-based compensation plans, net of tax   $ 4.8 4.2 4.3
Performance Based Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock performance shares earned   200.00%    
Additional restricted shares issued   94,956    
Restricted stock vesting date   Jan. 02, 2024    
Restricted stock grants   201,830    
Restricted stock grants, Weighted average grant date fair value   $ 33.39    
Unrecognized compensation cost related to non-vested share-based compensation   $ 7.2 $ 7.6 $ 6.5
Unrecognized compensation cost weighted average period recognized (years)   1 year 6 months 1 year 6 months 1 year 6 months
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock grants, Weighted average grant date fair value $ 45.62      
Total fair value of restricted shares vested   $ 26.1 $ 22.7 $ 25.4
2022 Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for future grant   2,888,438    
Employees [Member] | Time Based Restricted Stock [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock vesting period   3 years    
Employees [Member] | Time Based Restricted Stock [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock vesting period   5 years    
Employees [Member] | Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock vesting period 3 years      
Restricted stock grants 100,862      
Employees [Member] | Performance Based Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock grants   106,874 103,588 159,216
Restricted stock grants, Weighted average grant date fair value   $ 39.75 $ 42.12 $ 28.5
Employees [Member] | Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock vesting period 5 years      
Restricted stock grants 437,166      
Employees [Member] | Time Based Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock grants 336,304      
Outside Directors [Member] | Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock vesting period 1 year      
Restricted stock grants 35,088