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Stock-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, 2024
USD ($)
$ / shares
shares
May 20, 2024
shares
May 17, 2024
shares
Sep. 30, 2024
USD ($)
$ / shares
shares
Jun. 30, 2024
shares
Mar. 31, 2024
shares
Sep. 30, 2023
shares
Jun. 30, 2023
shares
Mar. 31, 2023
shares
Sep. 30, 2024
USD ($)
$ / shares
shares
Sep. 30, 2023
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Deferred compensation (in shares) 123,147                 7,756  
Shares due to exercise of employee stock options and issuance of directors' deferred stock       8,190 4,375 183 895 3,104 699    
Exercised (in shares)                   10,625 0
Closing share price (in usd per share) | $ / shares $ 41.96     $ 41.96           $ 41.96  
Share-based compensation arrangement by share-based payment award, options, grants since inception (in shares) 1,000,000.0     1,000,000.0           1,000,000.0  
Weighted average remaining contractual life of the Company's outstanding options                   5 years 2 months 12 days  
Weighted average remaining contractual life of the Company's exercisable options                   4 years 6 months  
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]                      
Shares due to exercise of employee stock options and issuance of directors' deferred stock                   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 | $                   $ 0.6  
Future expense | $ $ 1.1     $ 1.1           $ 1.1  
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 | $                   $ 0.9 $ 1.0
Future expense | $ 4.1     4.1           $ 4.1  
Granted (in shares)                   88,200  
Restricted Stock | Officers                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Award vesting period     5 years                
Granted (in shares)     117,000                
Restricted Stock | Directors                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Award vesting period   3 years                  
Granted (in shares)   18,000                  
Performance Shares                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share-based payment arrangement, expense | $                   $ 0.3  
Future expense | $ $ 3.0     $ 3.0           $ 3.0