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Share-Based Compensation Plans (Narrative) (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 USD ($) installment shares | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | May 18, 2021 shares | Jan. 02, 2008 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation | $ 8.3 | $ 13.6 | $ 11.0 |  |
Deferred income tax benefits for stock options and restricted stock | 0.7 | 1.7 | 1.4 |  |
Total intrinsic value | $ 5.8 | 8.0 | $ 17.7 |  |
Restricted shares vesting (as a percent) | 8.33% |  |  |  |
Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expiration period | 10 years |  |  |  |
Unrecognized compensation expense | $ 0.3 |  |  |  |
Weighted-average period | 9 months 14 days |  |  |  |
Restricted Stock [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period | 3 years |  |  |  |
Total fair value of vested restricted shares | $ 2.9 |  |  |  |
Restricted Stock [Member] | Director |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period | 1 year |  |  |  |
Time-Vested Restricted Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period | 4 years |  |  |  |
Award vesting installments | installment | 4 |  |  |  |
Performance-Vested Restricted Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period | 2 years |  |  |  |
Award vesting installments | installment | 1 |  |  |  |
Period of earned awards become vested | 90 days |  |  |  |
Award performance measurement period | 2 years |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation expense | $ 12.1 |  |  |  |
Weighted-average period | 1 year 3 months 18 days |  |  |  |
Total fair value of vested restricted shares | $ 11.6 | $ 0.5 |  |  |
Minimum | Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period | 1 year |  |  |  |
Minimum | Performance-Vested Restricted Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting percentage of target grant amount | 0.00% |  |  |  |
Maximum | Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period | 4 years |  |  |  |
Maximum | Restricted Stock [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted shares vesting (as a percent) | 100.00% |  |  |  |
Maximum | Performance-Vested Restricted Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting percentage of target grant amount | 200.00% |  |  |  |
2007 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares authorized (in shares) | shares |  |  |  |  | 17,000,000
Two Thousand Twenty-One Equity Incentive Plan Member |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares authorized (in shares) | shares |  |  |  | 23,100,000 |
Number of shares reserved for issuance (in shares) | shares |  |  |  | 22,800,000 |
Number of shares available for grant (in shares) | shares | 20,600,000 |  |  |  |

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