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Stock-Based Compensation Plans (Information Regarding Restricted Shares) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
General vesting period (years) | 3 years |  |
Unearned compensation costs | $ 19.2 | $ 18.5 |
Recognition of unearned compensation, (years) | 1 year |  |
Fair value of Restricted Shares vested | $ 28.7 | 24.2 | $ 23.5
Stock-based compensation expense | 30.5 | 27.8 | 25.5
Related income tax benefit | (6.9) | (6.3) | (5.8)
Net stock-based compensation expense | $ 23.6 | $ 21.5 | $ 19.7
Shares |  |  |
Outstanding — beginning of year (in shares) | 1,741,486 |  |
Granted (in shares) | 823,703 |  |
Vested (in shares) | (787,870) |  |
Canceled (in shares) | (110,636) |  |
Outstanding — ending of year (in shares) | 1,666,683 | 1,741,486 |
Weighted Average Grant-Date Fair Value |  |  |
Outstanding — beginning of year (in dollars per share) | $ 36.06 |  |
Granted (in dollars per share) | 42.73 |  |
Vested (in dollars per share) | 36.40 |  |
Canceled (in dollars per share) | 36.30 |  |
Outstanding — ending of year (in dollars per share) | $ 39.18 | $ 36.06 |
Restricted Stock | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
General expiration period, from date of grant or time of termination (years) | 1 year |  |
General vesting period (years) | 1 year |  |
Restricted Stock | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
General expiration period, from date of grant or time of termination (years) | 3 years |  |
General vesting period (years) | 3 years |  |
Performance Shares |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
General vesting period (years) | 36 months |  |
Shares |  |  |
Outstanding — ending of year (in shares) | 520,000 |  |
Weighted Average Grant-Date Fair Value |  |  |
Estimated vesting of shares based on performance shares | 520,000 |  |
Performance Shares | Minimum |  |  |
Weighted Average Grant-Date Fair Value |  |  |
Estimated vesting of shares based on performance shares | 0 |  |
Performance Shares | Maximum |  |  |
Weighted Average Grant-Date Fair Value |  |  |
Estimated vesting of shares based on performance shares | 1,196,000 |  |

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