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Share-based Employee Compensation, Stock Option Plans, and Deferred Compensation Plan for Directors - Narrative (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
$ / shares
shares
May 09, 2025
shares
Dec. 31, 2024
shares
May 20, 2024
shares
May 17, 2024
shares
Sep. 30, 2025
USD ($)
$ / shares
shares
Sep. 30, 2024
USD ($)
shares
Sep. 30, 2025
USD ($)
$ / shares
shares
Sep. 30, 2024
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Deferred compensation (in shares) 126,291   125,917         9,563 7,756
Share-based payment arrangement, expense | $           $ 0.5 $ 0.4 $ 1.3 $ 0.9
Exercised (in shares)           0 6,250,000 0 10,625,000
Closing share price (in usd per share) | $ / shares $ 31.87         $ 31.87   $ 31.87  
Share-based compensation arrangement by share-based payment award, options, grants since inception (in shares) 1,100,000         1,100,000   1,100,000  
Weighted average remaining contractual life of the Company's outstanding options               4 years 7 months 6 days  
Weighted average remaining contractual life of the Company's exercisable options               4 years 2 months 12 days  
Options granted (in shares)               0  
Minimum required percentage of shares granted that will vest               0.90  
Minimum                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Estimated percentage of shares granted that will vest               0.50  
Actual percentage of shares granted that will vest               0.90  
Maximum                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Estimated percentage of shares granted that will vest               1.50  
Actual percentage of shares granted that will vest               1.10  
Common stock                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Due to directors' deferred compensation plan (in shares)               9,189 7,970
Employee Stock Option                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Expiration period               10 years  
Share-based payment arrangement, expense | $           $ 0.1 $ 0.2 $ 0.4 $ 0.6
Future expense | $ $ 0.5         0.5   $ 0.5  
Employee Stock Option | Officers                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award vesting period               4 years  
Restricted Stock                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share-based payment arrangement, expense | $           0.4 $ 0.2 $ 0.9 $ 0.3
Future expense | $ 5.8         5.8   $ 5.8  
Restricted stock granted (in shares)               87,400  
Restricted Stock | Officers                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award vesting period         5 years        
Options granted (in shares)   119,000     117,000        
Restricted Stock | Director                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award vesting period               3 years  
Restricted Stock | Director | Non-employee                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Options granted (in shares)   16,000              
Restricted stock granted (in shares)       18,000          
Performance Shares                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Future expense | $ $ 5.3         $ 5.3   $ 5.3