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Share-Based Compensation Plans - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |
Share-based compensation expense - pre-tax, recognized | $ 211.0 | $ 199.0 | $ 288.0
RSU expense | 29.0 |  |
Unrecognized compensation cost related to grants | 42.0 |  |
Proceeds from stock options exercised | $ 162.0 |  |
Weighted Average Remaining Contractual Life, options exercisable, end of year (years) | 5 years 10 months 13 days |  |
Stock Options |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |
Stock options, weighted average grant-date fair value | $ 12.51 | $ 11.43 | $ 10.77
Share-based compensation expense - pre-tax, recognized | $ 18.0 |  |
Share-based compensation expense - pre-tax, not yet recognized | $ 13.0 |  |
Share-based compensation expense, expected period for amortization | 2 years 3 months |  |
Restricted Stock Units (RSUs) |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |
Share-based compensation expense, expected period for amortization | 4 years 3 months |  |
Vesting period (in years) | 1 year 1 month 2 days |  |
Granted (in shares) | 241,536 | 208,641 | 1,070,458
Deferred Stock Units (DSUs) |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |
Share-based compensation expense - pre-tax, recognized | $ 2.6 | $ 2.6 | $ 2.7
Granted (in shares) | 33,940 | 47,344 | 46,273
Minimum | Restricted Stock Units (RSUs) |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |
Vesting period (in years) | 1 year |  |
Minimum | Awarded 2020 To 2022 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |
Percentage of performance period depending on which actual number of awards can be earned | 0.00% |  |
Maximum | Stock Options |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |
Contractual term of the option | 10 years |  |
Involuntary termination expiration period (in years) | 3 years |  |
Maximum | Restricted Stock Units (RSUs) |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |
Vesting period (in years) | 5 years |  |
Maximum | Awarded 2020 To 2022 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |
Percentage of performance period depending on which actual number of awards can be earned | 200.00% |  |
AIG 2021 Omnibus Incentive Plan |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |
Common stock reserved for future grant (in shares) | 8,100,000 |  |
Reduction in number of shares available for grants (in shares) | 1 |  |
Number of shares reserved for future grants (in shares) | 23,168,953 |  |
Long Term Incentive Plans |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |
Performance period | 3 years |  |

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