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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 |

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