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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2024
Share-Based Payment Arrangement [Abstract] |
Schedule of Stock-Based Compensation Expenses | The following table shows stock-based compensation unamortized compensation expense and the weighted-average periods over which the unamortized compensation expense is expected to be recognized:
| Year ended December 31,
(in millions, except years) | 2024 |  | 2023 |  | 2022
Unamortized compensation expense | $ | 13.5 |  |  | $ | 13.3 |  |  | $ | 14.9 |
Expected period to be recognized for employees | 3.7 years |  | 4.1 years |  | 4.3 years
Expected period to be recognized for directors | 0.3 years |  | 0.3 years |  | 0.3 years
Schedule of Share-Based Payment Arrangement, Restricted Stock and Performance-Based Share Activity | Our restricted and performance-based share activity was as follows for the years ended December 31, 2024 and 2023:
| Shares |  | Weighted Average Grant Date Fair Value per Share
Balance at December 31, 2022 | 880,829 |  |  | $ | 31.79 |
Granted | 230,875 |  |  | 27.00 |
Vested | (248,065) |  |  | 36.30 |
Performance Shares Target Adjustment | 29,137 |  |  | 36.30 |
Forfeited | (11,800) |  |  | 35.36 |
Balance at December 31, 2023 | 880,976 |  |  | $ | 29.48 |
Granted | 277,742 |  |  | 24.25 |
Vested | (181,430) |  |  | 34.46 |
Performance Shares Target Adjustment | (14,247) |  |  | 39.28 |
Forfeited | (34,017) |  |  | 29.83 |
Balance at December 31, 2024 | 929,024 |  |  | $ | 26.82 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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