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Capital Stock and Equity Compensation (Tables) | 6 Months Ended
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Jun. 30, 2025
Share-Based Payment Arrangement, Noncash Expense [Abstract] |
Schedule of Stockholders Equity |
(Dollars in millions, except shares and per share amounts) |  |  |  |  |  |
Period |  | Total Number of Shares Purchased |  | Average Price Paid per Share |  | Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs |  | Approximate Dollar Value of Shares that May Yet be Purchased under the Plans or Programs
April 1, 2025 to April 30, 2025 |  | — |  | $ | — |  |  | — |  | $ | 104.2 |
May 1, 2025 to May 31, 2025 |  | 406,560 |  | $ | 63.09 |  |  | 406,560 |  | $ | 77.4 |
June 1, 2025 to June 30, 2025 |  | 19,430 |  | $ | 66.01 |  |  | 19,430 |  | $ | 76.1 |
Schedule of Share-Based Payment Arrangement, Expensed and Capitalized, Amount | The components of equity compensation expense were as follows:
| Three Months Ended |  | Six Months Ended
(Dollars in millions) | June 30, 2025 |  | June 30, 2024 |  | June 30, 2025 |  | June 30, 2024
Performance-based restricted stock units expense | $ | 2.1 |  |  | $ | 2.0 |  |  | $ | 3.9 |  |  | $ | 3.3 |
Time-based restricted stock units expense | 1.8 |  |  | 2.1 |  |  | 3.5 |  |  | 4.0 |
Deferred stock units expense | 0.1 |  |  | 1.3 |  |  | 0.2 |  |  | 1.3 |
Other | 0.3 |  |  | (0.1) |  |  | 0.3 |  |  | 0.2 |
Total equity compensation expense | $ | 4.3 |  |  | $ | 5.3 |  |  | $ | 7.9 |  |  | $ | 8.8 |
Schedule of Weighted-Average Assumptions Used | The following table sets forth the assumptions used in the Monte Carlo calculation for each material award granted in 2025 and 2024:
| February 26, 2025 |  | February 19, 2024 |  | February 13, 2024
Expected volatility | 45.6% |  | 46.3% |  | 46.2%
Expected term (in years) | 2.9 |  | 2.9 |  | 2.9
Risk-free interest rate | 4.28% |  | 4.35% |  | 4.35%
Schedule of Restricted Stock and Restricted Stock Activity | A summary of activity of the outstanding performance-based restricted stock units for the six months ended June 30, 2025 is presented below:
| Performance-Based Restricted Stock Units
Awards outstanding as of December 31, 2024 | 109,106 |
Awards granted | 83,834 |
Stock issued | — |
Awards forfeited/cancelled | (5,069) |
Awards outstanding as of June 30, 2025 | 187,871 |
A summary of activity of the outstanding time-based restricted stock units for the six months ended June 30, 2025 is presented below:
| Time-Based Restricted Stock Units
Awards outstanding as of December 31, 2024 | 110,745 |
Awards granted | 88,973 |
Stock issued | (47,882) |
Awards forfeited/cancelled | (5,244) |
Awards outstanding as of June 30, 2025 | 146,592 |
A summary of activity of the outstanding deferred stock units for the six months ended June 30, 2025 is presented below:
| Deferred Stock Units
Awards outstanding as of December 31, 2024 | 11,900 |
Awards granted | 22,616 |
Stock issued | (10,950) |
Awards outstanding as of June 30, 2025 | 23,566 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -SubTopic 10 -Topic 505 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-2 + Details
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