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Investments - Schedule of Fixed Maturities Available for Sale by Component (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | $ 18,948,357 |  | $ 18,835,809 |  |  |
Allowance for Credit Losses | (10,415) | $ (10,355) | (10,395) | $ (7,132) | $ (7,132) | $ (7,115)
Gross Unrealized Gains | 448,518 |  | 254,587 |  |  |
Gross Unrealized Losses | (1,589,706) |  | (1,924,989) |  |  |
Fair value | $ 17,796,754 |  | $ 17,155,012 |  |  |
Percentage of total fixed maturities | 100.00% |  | 100.00% |  |  |
U.S. Government direct, guaranteed, and government-sponsored enterprises |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | $ 405,807 |  | $ 401,753 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Gross Unrealized Gains | 147 |  | 1 |  |  |
Gross Unrealized Losses | (26,787) |  | (42,794) |  |  |
Fair value | $ 379,167 |  | $ 358,960 |  |  |
Percentage of total fixed maturities | 2.00% |  | 2.00% |  |  |
States, municipalities, and political subdivisions |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | $ 3,390,124 |  | $ 3,300,901 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Gross Unrealized Gains | 28,759 |  | 20,662 |  |  |
Gross Unrealized Losses | (545,729) |  | (534,759) |  |  |
Fair value | $ 2,873,154 |  | $ 2,786,804 |  |  |
Percentage of total fixed maturities | 16.00% |  | 16.00% |  |  |
Foreign governments |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | $ 47,915 |  | $ 36,883 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Gross Unrealized Gains | 291 |  | 18 |  |  |
Gross Unrealized Losses | (8,195) |  | (8,870) |  |  |
Fair value | $ 40,011 |  | $ 28,031 |  |  |
Percentage of total fixed maturities | 0.00% |  | 0.00% |  |  |
Corporates |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | $ 15,010,998 |  | $ 14,976,815 |  |  |
Allowance for Credit Losses | (7,118) |  | (7,098) |  |  |
Gross Unrealized Gains | 418,938 |  | 227,924 |  |  |
Gross Unrealized Losses | (1,008,042) |  | (1,336,380) |  |  |
Fair value | $ 14,414,776 |  | $ 13,861,261 |  |  |
Percentage of total fixed maturities | 81.00% |  | 81.00% |  |  |
Corporates | Industrials |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | $ 7,891,877 |  | $ 7,889,074 |  |  |
Allowance for Credit Losses | (7,118) |  | (7,098) |  |  |
Gross Unrealized Gains | 193,171 |  | 105,610 |  |  |
Gross Unrealized Losses | (601,835) |  | (805,330) |  |  |
Fair value | $ 7,476,095 |  | $ 7,182,256 |  |  |
Percentage of total fixed maturities | 42.00% |  | 42.00% |  |  |
Corporates | Financial |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | $ 5,018,604 |  | $ 5,006,375 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Gross Unrealized Gains | 146,863 |  | 82,598 |  |  |
Gross Unrealized Losses | (318,860) |  | (413,043) |  |  |
Fair value | $ 4,846,607 |  | $ 4,675,930 |  |  |
Percentage of total fixed maturities | 27.00% |  | 27.00% |  |  |
Corporates | Utilities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | $ 2,100,517 |  | $ 2,081,366 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Gross Unrealized Gains | 78,904 |  | 39,716 |  |  |
Gross Unrealized Losses | (87,347) |  | (118,007) |  |  |
Fair value | $ 2,092,074 |  | $ 2,003,075 |  |  |
Percentage of total fixed maturities | 12.00% |  | 12.00% |  |  |
Collateralized debt obligations |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | $ 0 |  | $ 36,923 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Gross Unrealized Gains | 0 |  | 5,943 |  |  |
Gross Unrealized Losses | 0 |  | 0 |  |  |
Fair value | $ 0 |  | $ 42,866 |  |  |
Percentage of total fixed maturities | 0.00% |  | 0.00% |  |  |
Other asset-backed securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Amortized Cost | $ 93,513 |  | $ 82,534 |  |  |
Allowance for Credit Losses | (3,297) |  | (3,297) |  |  |
Gross Unrealized Gains | 383 |  | 39 |  |  |
Gross Unrealized Losses | (953) |  | (2,186) |  |  |
Fair value | $ 89,646 |  | $ 77,090 |  |  |
Percentage of total fixed maturities | 1.00% |  | 1.00% |  |  |

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