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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2025
Share-Based Payment Arrangement [Abstract] |
Share-based compensation expense | Share-based compensation expense and cash flow amounts were as follows:
| Year Ended December 31,
| 2025 |  | 2024 |  | 2023
| (Dollars in millions)
Share-based compensation expense | $ | 13.8 |  |  | $ | 7.3 |  |  | $ | 6.9 |
Tax benefit | — |  |  | — |  |  | — |
Share-based compensation expense, net of tax benefit | $ | 13.8 |  |  | $ | 7.3 |  |  | $ | 6.9 |
Schedule of Share-based Compensation, Restricted Stock Units Activity | A summary of restricted stock unit activity is as follows:
| Year Ended December 31, 2025 |  | Weighted Average Grant-Date Fair Value
Nonvested at December 31, 2024 | 405,130 |  |  | $ | 24.32 |
Granted | 284,737 |  |  | 20.78 |
Vested | (144,377) |  |  | 24.67 |
Forfeited | (27,489) |  |  | 19.24 |
Nonvested at December 31, 2025 | 518,001 |  |  | $ | 22.37 |
Schedule of Performance Units Activity | A summary of performance unit activity is as follows:
| Year Ended December 31, 2025 |  | Weighted Average Remaining Contractual Life
Nonvested at December 31, 2024 | 274,911 |  |  | 1.5 |
Granted | 199,566 |  |  |
Vested | — |  |  |
Forfeited | (9,534) |  |  |
Nonvested at December 31, 2025 | 464,943 |  |  | 1.2 |

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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 changes in outstanding nonvested performance-based units. + 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)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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