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Business Segments - Schedule of Assets by Segment (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |  |
Accrued investment income | $ 284,888 |  | $ 269,791 |  |  |
Deferred acquisition costs | 6,872,342 |  | 6,495,589 | $ 6,386,682 |  |
Goodwill | 490,446 |  | 490,446 |  |  |
Total assets | 30,527,616 |  | 29,076,181 |  |  |
Life |  |  |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |  |
Deferred acquisition costs | 6,035,556 | $ 5,931,048 | 5,700,755 | 5,607,729 | $ 5,495,593 | $ 5,271,775
Health |  |  |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |  |
Deferred acquisition costs | 836,449 | $ 823,082 | 793,421 | $ 777,162 | $ 762,523 | $ 734,735
Operating Segments |  |  |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |  |
Cash and invested assets | 20,629,430 |  | 19,736,888 |  |  |
Accrued investment income | 284,888 |  | 269,791 |  |  |
Deferred acquisition costs | 6,872,005 |  | 6,494,176 |  |  |
Goodwill | 490,446 |  | 490,446 |  |  |
Total segment assets | 28,276,769 |  | 26,991,301 |  |  |
Operating Segments | Life |  |  |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |  |
Cash and invested assets | 0 |  | 0 |  |  |
Accrued investment income | 0 |  | 0 |  |  |
Deferred acquisition costs | 6,035,556 |  | 5,700,755 |  |  |
Goodwill | 309,609 |  | 309,609 |  |  |
Total segment assets | 6,345,165 |  | 6,010,364 |  |  |
Operating Segments | Health |  |  |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |  |
Cash and invested assets | 0 |  | 0 |  |  |
Accrued investment income | 0 |  | 0 |  |  |
Deferred acquisition costs | 836,449 |  | 793,421 |  |  |
Goodwill | 180,837 |  | 180,837 |  |  |
Total segment assets | 1,017,286 |  | 974,258 |  |  |
Operating Segments | Investment |  |  |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |  |
Cash and invested assets | 20,629,430 |  | 19,736,888 |  |  |
Accrued investment income | 284,888 |  | 269,791 |  |  |
Deferred acquisition costs | 0 |  | 0 |  |  |
Goodwill | 0 |  | 0 |  |  |
Total segment assets | 20,914,318 |  | 20,006,679 |  |  |
Corporate & Other |  |  |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |  |
Annuity and other corporate | $ 2,250,847 |  | $ 2,084,880 |  |  |

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