XML 142 R94.htm IDEA: XBRL DOCUMENT v3.22.4
Stock-Based Compensation - Additional Information (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares authorized under stock compensation plan 11.0    
Shares available for grant under stock compensation plan 5.2    
Share-based compensation expense $ 10.2 $ 7.6 $ 8.4
Tax benefit from share-based compensation expense $ 1.9 $ 1.5 $ 1.7
Vesting period 3 years    
Weighted average fair value of options granted (usd per share) $ 12.64 $ 13.54 $ 7.86
Stock options, vested and expected to vest, outstanding (shares) 1.2    
Stock options, vested and expected to vest, weighted average exercise price (usd per share) $ 27.24    
Exercisable at end of year (shares) 0.8 1.0 1.5
Stock options, expected to vest (shares) 0.4    
Stock options outstanding, aggregate intrinsic value $ 22.8    
Stock options exercisable, aggregate intrinsic value 19.0    
Stock options exercised during the period, total intrinsic value 9.7 $ 22.7 $ 13.9
Tax benefit from stock options exercised 2.5 5.7 3.3
Proceeds from stock compensation activity 0.2 4.2 0.6
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense related to share-based compensation plans 2.1 2.0 1.8
Unrecognized compensation cost $ 2.8    
Weighted-average recognition period for unrecognized compensation cost 1 year 10 months 24 days    
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense related to share-based compensation plans $ 3.8 2.6 2.5
Unrecognized compensation cost $ 4.2    
Weighted-average recognition period for unrecognized compensation cost 1 year 8 months 12 days    
Grant-date fair value of awards vested $ 2.1 1.9 1.7
PSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense related to share-based compensation plans 4.3 3.0 4.1
Unrecognized compensation cost, performance share units $ 4.7    
Weighted-average recognition period for unrecognized compensation cost 1 year 9 months 18 days    
Grant-date fair value of awards vested $ 4.0 $ 2.6 $ 5.4
Minimum | PSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percentage 0.00%    
Maximum | PSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percentage 200.00%    
Vesting Percentage with TSR Modifier 240.00%    
Performance-based Restricted Stock Units, 2022 Grants [Member] | PSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance share units performance period 3 years    
Performance-based Restricted Stock Units, 2021 Grants [Member] | PSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance share units performance period 3 years    
Performance-based Restricted Stock Units, 2020 Grants | PSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance share units performance period 3 years    
Vesting percentage 125.00%