XML 118 R102.htm IDEA: XBRL DOCUMENT v3.24.0.1
Share-Based Compensation - Narrative (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
plan
$ / shares
shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Number of plans | plan 5    
Total share-based compensation expense $ 11.6 $ 7.8 $ 9.5
Total excess tax benefit recognized for share-based compensation arrangements $ 0.1 $ 0.3 $ 0.7
Weighted-average grant date fair value of stock options granted (in dollars per share) | $ / shares $ 24.21 $ 23.45 $ 22.01
Total intrinsic value of stock options exercised $ 5.9 $ 0.4 $ 3.9
Aggregate intrinsic value of options outstanding 14.3    
Aggregate intrinsic value of options exercisable $ 12.5    
Weighted-average remaining contractual life for options outstanding 5 years 1 month 6 days    
Weighted-average remaining contractual life for options exercisable 4 years 3 months 18 days    
Total share-based liabilities $ 0.4 0.3  
Option      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
New stock option awards granted vest period 3 years    
Contractual term 10 years    
Unrecognized compensation cost for non-vested options $ 1.5    
Weighted-average period 1 year 3 months 18 days    
Restricted Stock      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
New stock option awards granted vest period 3 years    
Unrecognized compensation cost for non-vested options $ 1.5    
Weighted-average period 1 year 8 months 12 days    
Required service period following grant date 6 months    
Vesting rights, required advance notice for resignation, period 6 months    
Total fair value of restricted shares vested $ 0.4 $ 1.7 $ 1.2
Vested (in shares) | shares 5,667    
Restricted Stock | Year One      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Vesting percentage of awards granted 33.33%    
Restricted Stock | Year Two      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Vesting percentage of awards granted 33.33%    
Restricted Stock | Year Three      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Vesting percentage of awards granted 33.33%    
Performance Shares      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
New stock option awards granted vest period 3 years    
Unrecognized compensation cost for non-vested options $ 7.8    
Weighted-average period 1 year 9 months 18 days    
Percentage of maximum increase in number of shares participant receives based on achievement of performance goals 200.00%    
Potential lowest number of shares participant receives based on achievement of performance goals 0.00%    
Vested (in shares) | shares 32,130 43,198 43,621
Restricted Stock Units (RSUs)      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
New stock option awards granted vest period 3 years    
Unrecognized compensation cost for non-vested options $ 3.8    
Weighted-average period 1 year 6 months    
Total fair value of restricted shares vested $ 3.0 $ 0.5 $ 3.2
Vested (in shares) | shares 38,303    
The 2010 Plan and the 2017 Plan      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Shares reserved for issuance (in shares) | shares 1,111,646    
The 2020 Plan      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]      
Shares reserved for issuance (in shares) | shares 975,475