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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2024
Share-Based Payment Arrangement [Abstract] |
Restricted Stock Unit Activity (Excluding Dividend Equivalents) | Restricted Share Unit Activity
Nonvested Share Units |  | Number of Share Units |  | Weighted Average Grant Date Fair Value Per Share
Nonvested at December 31, 2023 | 932,728 |  |  | $ | 54.16 |
Granted | 192,362 |  |  | 84.59 |
Vested | (337,274) |  |  | 48.49 |
Forfeited | (7,335) |  |  | 54.81 |
Nonvested at December 31, 2024 | 780,481 |  |  | $ | 64.03 |
Performance-Based Restricted Share Unit Activity
Performance-Based Restricted Share Units |  | Number of Performance-Based Share Units |  | Weighted Average Grant Date Fair Value Per Share
Nonvested at December 31, 2023 | 677,856 |  |  | $ | 64.62 |
Granted (1) | 478,324 |  |  | 94.56 |
Vested (2) | (404,114) |  |  | 41.91 |
Forfeited | — |  |  | — |
Nonvested at December 31, 2024 (3) | 752,066 |  |  | $ | 72.39 |
____________________ (1) Includes 118,086 adjusted book value performance-based restricted share units and 177,130 TSR performance-based restricted share units that were granted prior to 2024 at a weighted average grant date fair value of $44.01 and $60.06, respectively, but met performance hurdles and vested during 2024. The weighted average grant date fair value per share excludes these shares. (2) Excludes 295,216 TSR performance-based restricted share units that vested during 2024 but were not delivered. (3) Excludes 157,854 performance-based restricted share units that have met performance hurdles and vest in February 2025. Includes 295,216 TSR performance-based restricted share units that vested during 2024 but will be delivered in 2025.
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions | The following are significant assumptions used in determining the fair value of the performance-based restricted share units tied to relative TSR.
|  | Years Ended December 31,
|  | 2024 |  | 2023 |  | 2022
Expected term |  | 3.00 years |  | 3.00 years |  | 2.85 years
Expected volatility |  | 20.72 | % | – | 87.00% |  | 29.22 | % | – | 110.25% |  | 27.19 | % | – | 78.96%
Dividend yield |  | 0.00% |  | 0.00% |  | 0.00%
Risk-free-rates |  | 4.38% |  | 4.38% |  | 1.74%
Grant-date fair value per share |  | $104.27 |  | $80.80 |  | $83.97
Restricted Stock Award Activity | Restricted Share Award Activity
Nonvested Shares |  | Number of Shares |  | Weighted Average Grant Date Fair Value Per Share
Nonvested at December 31, 2023 | 38,464 |  |  | $ | 52.26 |
Granted | 21,413 |  |  | 77.54 |
Vested | (38,464) |  |  | 52.26 |
Forfeited | — |  |  | — |
Nonvested at December 31, 2024 | 21,413 |  |  | $ | 77.54 |
Stock Purchase Plan | Stock Purchase Plan
| Year Ended December 31,
| 2024 |  | 2023 |  | 2022
| (dollars in millions)
Proceeds from purchase of shares by employees | $ | 2.2 |  |  | $ | 2.2 |  |  | $ | 2.4 |
Number of shares issued by the Company | 33,348 |  |  | 47,204 |  |  | 53,453 |
Share-Based Compensation Expense Summary | Share-Based Compensation Expense Summary
| Year Ended December 31,
| 2024 |  | 2023 |  | 2022
| (in millions)
Share‑based compensation expense | $ | 34 |  |  | $ | 36 |  |  | $ | 39 |
Share‑based compensation capitalized as DAC | 2 |  |  | 3 |  |  | 3 |
Income tax benefit | 5 |  |  | 5 |  |  | 6 |

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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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