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Investments - Schedule of Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | $ 17,796,754 | $ 17,155,012 |
Percentage of total | 100.00% | 100.00% |
U.S. Government direct, guaranteed, and government-sponsored enterprises |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | $ 379,167 | $ 358,960 |
States, municipalities, and political subdivisions |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 2,873,154 | 2,786,804 |
Foreign governments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 40,011 | 28,031 |
Corporates |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 14,414,776 | 13,861,261 |
Corporates | Industrials |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 7,476,095 | 7,182,256 |
Corporates | Financial |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 4,846,607 | 4,675,930 |
Corporates | Utilities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 2,092,074 | 2,003,075 |
Collateralized debt obligations |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 0 | 42,866 |
Other asset-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 89,646 | 77,090 |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | $ 0 | $ 0 |
Percentage of total | 0.00% | 0.00% |
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Government direct, guaranteed, and government-sponsored enterprises |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | $ 0 | $ 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | States, municipalities, and political subdivisions |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign governments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporates |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporates | Industrials |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporates | Financial |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporates | Utilities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateralized debt obligations |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other asset-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 0 | 0 |
Significant Other Observable Inputs (Level 2) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | $ 17,416,570 | $ 16,680,898 |
Percentage of total | 98.00% | 97.00% |
Significant Other Observable Inputs (Level 2) | U.S. Government direct, guaranteed, and government-sponsored enterprises |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | $ 379,167 | $ 358,960 |
Significant Other Observable Inputs (Level 2) | States, municipalities, and political subdivisions |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 2,873,154 | 2,786,804 |
Significant Other Observable Inputs (Level 2) | Foreign governments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 40,011 | 28,031 |
Significant Other Observable Inputs (Level 2) | Corporates |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 14,098,501 | 13,441,196 |
Significant Other Observable Inputs (Level 2) | Corporates | Industrials |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 7,369,953 | 6,998,900 |
Significant Other Observable Inputs (Level 2) | Corporates | Financial |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 4,724,499 | 4,551,737 |
Significant Other Observable Inputs (Level 2) | Corporates | Utilities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 2,004,049 | 1,890,559 |
Significant Other Observable Inputs (Level 2) | Collateralized debt obligations |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 0 | 0 |
Significant Other Observable Inputs (Level 2) | Other asset-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 25,737 | 65,907 |
Significant Unobservable Inputs (Level 3) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | $ 380,184 | $ 474,114 |
Percentage of total | 2.00% | 3.00% | 3.00%
Significant Unobservable Inputs (Level 3) | U.S. Government direct, guaranteed, and government-sponsored enterprises |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | $ 0 | $ 0 |
Significant Unobservable Inputs (Level 3) | States, municipalities, and political subdivisions |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Foreign governments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Corporates |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | $ 316,275 | 420,065 |
Percentage of total | 2.00% |  | 3.00%
Significant Unobservable Inputs (Level 3) | Corporates | Industrials |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | $ 106,142 | 183,356 |
Significant Unobservable Inputs (Level 3) | Corporates | Financial |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 122,108 | 124,193 |
Significant Unobservable Inputs (Level 3) | Corporates | Utilities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | 88,025 | 112,516 |
Significant Unobservable Inputs (Level 3) | Collateralized debt obligations |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | $ 0 | 42,866 |
Percentage of total | 0.00% |  | 0.00%
Significant Unobservable Inputs (Level 3) | Other asset-backed securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value | $ 63,909 | $ 11,183 |

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