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Policy Liabilities - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Dec. 31, 2023
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |  |  |
Change in morality and lapse assumptions, remeasurement gain (loss) | $ 134,300 | $ 46,300 |  |  |  |  |  |
Variances in expected experience, remeasurement gain (loss) | 24,000 | 14,700 | $ 53,600 | $ 38,400 |  |  |  |
Life |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |  |  |
Change in morality and lapse assumptions, remeasurement gain (loss) | 130,900 | 56,800 |  |  |  |  |  |
Variances in expected experience, remeasurement gain (loss) | 18,500 | 13,700 |  |  |  |  |  |
Expected future gross premiums | 29,678,228 | 29,804,051 | 29,678,228 | 29,804,051 |  |  |  |
Expected future net premiums | 11,856,124 | 12,406,270 | 11,856,124 | 12,406,270 | $ 12,000,397 | $ 11,757,317 | $ 11,981,537 | $ 12,342,307
Difference between expected future gross premiums and expected future net premiums | 17,800,000 | 17,400,000 | 17,800,000 | 17,400,000 |  |  |  |
Health |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |  |  |
Change in morality and lapse assumptions, remeasurement gain (loss) | 3,400 | (10,500) |  |  |  |  |  |
Variances in expected experience, remeasurement gain (loss) | 5,500 | 1,000 |  |  |  |  |  |
Expected future gross premiums | 14,040,440 | 12,407,986 | 14,040,440 | 12,407,986 |  |  |  |
Expected future net premiums | 7,518,346 | 6,452,555 | 7,518,346 | 6,452,555 | $ 6,627,718 | $ 6,314,148 | $ 6,007,794 | $ 6,089,728
Difference between expected future gross premiums and expected future net premiums | $ 6,500,000 | $ 5,900,000 | $ 6,500,000 | $ 5,900,000 |  |  |  |

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