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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2022
Share-Based Payment Arrangement [Abstract] |
Restricted Stock Unit Activity (Excluding Dividend Equivalents) | Restricted Stock Unit Activity
Nonvested Stock Units |  | Number of Stock Units |  | Weighted Average Grant Date Fair Value Per Share
Nonvested at December 31, 2021 | 906,302 |  |  | $ | 43.25 |
Granted | 441,436 |  |  | 56.46 |
Vested | (279,089) |  |  | 41.26 |
Forfeited | (1,583) |  |  | 47.39 |
Nonvested at December 31, 2022 | 1,067,066 |  |  | $ | 49.18 |
Performance Restricted Stock Unit Activity
Performance Restricted Stock Units |  | Number of Performance Share Units |  | Weighted Average Grant Date Fair Value Per Share
Nonvested at December 31, 2021 | 614,912 |  |  | $ | 46.25 |
Granted (1) | 217,551 |  |  | 62.89 |
Vested (1) | (197,078) |  |  | 41.34 |
Forfeited | — |  |  | — |
Nonvested at December 31, 2022 (2) | 635,385 |  |  | $ | 54.26 |
____________________ (1) Includes 94,209 performance restricted stock units that were granted prior to 2022 at a weighted average grant date fair value of $41.34, but met performance hurdles and vested during 2022. The weighted average grant date fair value per share excludes these shares. (2) Excludes 167,942 performance restricted stock units that have met performance hurdles and will be eligible for vesting after December 31, 2022.
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions | The following are significant assumptions used in determining the fair value of the performance restricted stock units tied to relative TSR.
|  | Years Ended December 31,
|  | 2022 |  | 2021 |  | 2020
Expected term |  | 2.85 years |  | 2.85 years |  | 2.84 years
Expected volatility |  | 27.19 | % | – | 78.96% |  | 26.55 | % | – | 65.84% |  | 11.93 | % | – | 48.12%
Dividend yield |  | 0.00% |  | 0.00% |  | 0.00%
Risk-free-rates |  | 1.74% |  | 0.22% |  | 1.14%
Grant-date fair value |  | $83.97 |  | $60.06 |  | $38.96
Restricted Stock Award Activity | Restricted Stock Award Activity
Nonvested Shares |  | Number of Shares |  | Weighted Average Grant Date Fair Value Per Share
Nonvested at December 31, 2021 | 44,797 |  |  | $ | 51.34 |
Granted | 36,403 |  |  | 59.47 |
Vested | (44,797) |  |  | 51.34 |
Forfeited | — |  |  | — |
Nonvested at December 31, 2022 | 36,403 |  |  | $ | 59.47 |
Stock Purchase Plan | Stock Purchase Plan
| Year Ended December 31,
| 2022 |  | 2021 |  | 2020
| (dollars in millions)
Proceeds from purchase of shares by employees | $ | 2.4 |  |  | $ | 2.1 |  |  | $ | 1.5 |
Number of shares issued by the Company | 53,453 |  |  | 67,615 |  |  | 72,797 |
Share-Based Compensation Expense Summary | Share-Based Compensation Expense Summary
| Year Ended December 31,
| 2022 |  | 2021 |  | 2020
| (in millions)
Share‑based compensation expense | $ | 39 |  |  | $ | 27 |  |  | $ | 25 |
Share‑based compensation capitalized as DAC | 3 |  |  | 2 |  |  | 1 |
Income tax benefit | 6 |  |  | 4 |  |  | 4 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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