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Fair Value of Financial Instruments - Schedule of Assets and Liabilities Measured at Fair Vale on a Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Financial Assets: |  |
Fair Value | $ 6,089,865 | $ 5,876,721
Recurring |  |
Financial Assets: |  |
Total assets at fair value | 6,089,865 | 5,876,721
Recurring | U.S. Treasury securities |  |
Financial Assets: |  |
Fair Value | 382,791 | 547,290
Recurring | U.S. agency mortgage-backed securities |  |
Financial Assets: |  |
Fair Value | 1,178,691 | 1,125,436
Recurring | Municipal debt securities |  |
Financial Assets: |  |
Fair Value | 613,089 | 583,501
Recurring | Non-U.S. government securities |  |
Financial Assets: |  |
Fair Value | 63,142 | 69,798
Recurring | Corporate debt securities: |  |
Financial Assets: |  |
Fair Value | 1,930,920 | 1,783,046
Recurring | Residential and commercial mortgage securities |  |
Financial Assets: |  |
Fair Value | 463,344 | 478,086
Recurring | Asset-backed securities |  |
Financial Assets: |  |
Fair Value | 817,812 | 631,959
Recurring | Money market funds |  |
Financial Assets: |  |
Fair Value | 640,076 | 657,605
Recurring | Quoted Prices in Active Markets for Identical Instruments (Level 1) |  |
Financial Assets: |  |
Total assets at fair value | 1,022,867 | 1,204,895
Recurring | Quoted Prices in Active Markets for Identical Instruments (Level 1) | U.S. Treasury securities |  |
Financial Assets: |  |
Fair Value | 382,791 | 547,290
Recurring | Quoted Prices in Active Markets for Identical Instruments (Level 1) | U.S. agency mortgage-backed securities |  |
Financial Assets: |  |
Fair Value | 0 | 0
Recurring | Quoted Prices in Active Markets for Identical Instruments (Level 1) | Municipal debt securities |  |
Financial Assets: |  |
Fair Value | 0 | 0
Recurring | Quoted Prices in Active Markets for Identical Instruments (Level 1) | Non-U.S. government securities |  |
Financial Assets: |  |
Fair Value | 0 | 0
Recurring | Quoted Prices in Active Markets for Identical Instruments (Level 1) | Corporate debt securities: |  |
Financial Assets: |  |
Fair Value | 0 | 0
Recurring | Quoted Prices in Active Markets for Identical Instruments (Level 1) | Residential and commercial mortgage securities |  |
Financial Assets: |  |
Fair Value | 0 | 0
Recurring | Quoted Prices in Active Markets for Identical Instruments (Level 1) | Asset-backed securities |  |
Financial Assets: |  |
Fair Value | 0 | 0
Recurring | Quoted Prices in Active Markets for Identical Instruments (Level 1) | Money market funds |  |
Financial Assets: |  |
Fair Value | 640,076 | 657,605
Recurring | Significant Other Observable Inputs (Level 2) |  |
Financial Assets: |  |
Total assets at fair value | 5,066,998 | 4,671,826
Recurring | Significant Other Observable Inputs (Level 2) | U.S. Treasury securities |  |
Financial Assets: |  |
Fair Value | 0 | 0
Recurring | Significant Other Observable Inputs (Level 2) | U.S. agency mortgage-backed securities |  |
Financial Assets: |  |
Fair Value | 1,178,691 | 1,125,436
Recurring | Significant Other Observable Inputs (Level 2) | Municipal debt securities |  |
Financial Assets: |  |
Fair Value | 613,089 | 583,501
Recurring | Significant Other Observable Inputs (Level 2) | Non-U.S. government securities |  |
Financial Assets: |  |
Fair Value | 63,142 | 69,798
Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities: |  |
Financial Assets: |  |
Fair Value | 1,930,920 | 1,783,046
Recurring | Significant Other Observable Inputs (Level 2) | Residential and commercial mortgage securities |  |
Financial Assets: |  |
Fair Value | 463,344 | 478,086
Recurring | Significant Other Observable Inputs (Level 2) | Asset-backed securities |  |
Financial Assets: |  |
Fair Value | 817,812 | 631,959
Recurring | Significant Other Observable Inputs (Level 2) | Money market funds |  |
Financial Assets: |  |
Fair Value | 0 | 0
Recurring | Significant Unobservable Inputs (Level 3) |  |
Financial Assets: |  |
Total assets at fair value | 0 | 0
Recurring | Significant Unobservable Inputs (Level 3) | U.S. Treasury securities |  |
Financial Assets: |  |
Fair Value | 0 | 0
Recurring | Significant Unobservable Inputs (Level 3) | U.S. agency mortgage-backed securities |  |
Financial Assets: |  |
Fair Value | 0 | 0
Recurring | Significant Unobservable Inputs (Level 3) | Municipal debt securities |  |
Financial Assets: |  |
Fair Value | 0 | 0
Recurring | Significant Unobservable Inputs (Level 3) | Non-U.S. government securities |  |
Financial Assets: |  |
Fair Value | 0 | 0
Recurring | Significant Unobservable Inputs (Level 3) | Corporate debt securities: |  |
Financial Assets: |  |
Fair Value | 0 | 0
Recurring | Significant Unobservable Inputs (Level 3) | Residential and commercial mortgage securities |  |
Financial Assets: |  |
Fair Value | 0 | 0
Recurring | Significant Unobservable Inputs (Level 3) | Asset-backed securities |  |
Financial Assets: |  |
Fair Value | 0 | 0
Recurring | Significant Unobservable Inputs (Level 3) | Money market funds |  |
Financial Assets: |  |
Fair Value | $ 0 | $ 0

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