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Capital Stock and Equity Compensation (Tables) | 9 Months Ended
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Sep. 30, 2024
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
March 1, 2024 to March 31, 2024 |  | 1,500 |  | $ | 109.92 |  |  | 1,500 |  | $ | 23.8 |
April 1, 2024 to April 31, 2024 |  | 70,893 |  | $ | 108.79 |  |  | 70,893 |  | $ | 116.2 |
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 2024 and 2023:
| February 19, 2024 |  | February 13, 2024 |  | February 9, 2023
Expected volatility | 46.3% |  | 46.2% |  | 53.2%
Expected term (in years) | 2.9 |  | 2.9 |  | 2.9
Risk-free interest rate | 4.35% |  | 4.35% |  | 4.08%
Schedule of Restricted Stock and Restricted Stock Activity | A summary of activity of the outstanding performance-based restricted stock units for the nine months ended September 30, 2024 is presented below:
| Performance-Based Restricted Stock Units
Awards outstanding as of December 31, 2023 | 73,528 |
Awards granted | 79,700 |
Stock issued | — |
Awards cancelled | (40,862) |
Awards outstanding as of September 30, 2024 | 112,366 |
A summary of activity of the outstanding time-based restricted stock units for the nine months ended September 30, 2024 is presented below:
| Time-Based Restricted Stock Units
Awards outstanding as of December 31, 2023 | 100,999 |
Awards granted | 68,060 |
Stock issued | (37,874) |
Awards cancelled | (20,123) |
Awards outstanding as of September 30, 2024 | 111,062 |
A summary of activity of the outstanding deferred stock units for the nine months ended September 30, 2024 is presented below:
| Deferred Stock Units
Awards outstanding as of December 31, 2023 | 8,100 |
Awards granted | 10,950 |
Stock issued | (7,150) |
Awards outstanding as of September 30, 2024 | 11,900 |

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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 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 No definition available. + 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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