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Investments - Schedule of Fixed Maturities by Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Amortized Cost, net |  |
Due in one year or less | $ 111,404 |
Due after one year through five years | 788,630 |
Due after five years through ten years | 1,878,317 |
Due after ten years through twenty years | 8,998,125 |
Due after twenty years | 7,071,236 |
Mortgage-backed and asset-backed securities | 90,230 |
Fixed maturities, net of allowance for credit losses | 18,937,942 |
Fair Value |  |
Due in one year or less | 111,847 |
Due after one year through five years | 815,353 |
Due after five years through ten years | 1,947,313 |
Due after ten years through twenty years | 8,593,860 |
Due after twenty years | 6,238,721 |
Mortgage-backed and asset-backed securities | 89,660 |
Fixed maturities, fair value | $ 17,796,754 | $ 17,155,012

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