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Investments - Schedule of Available for Sale (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 6,231,018 | $ 5,586,730
Unrealized Gains | 4,155 | 13,446
Unrealized Losses | (358,452) | (336,437)
Fair Value | 5,876,721 | 5,263,739
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 561,853 | 1,014,076
Unrealized Gains | 325 | 1,434
Unrealized Losses | (14,888) | (19,128)
Fair Value | 547,290 | 996,382
U.S. agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost |  | 7,199
Unrealized Gains |  | 0
Unrealized Losses |  | (4)
Fair Value |  | 7,195
U.S. agency mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,249,259 | 922,907
Unrealized Gains | 42 | 438
Unrealized Losses | (123,865) | (101,999)
Fair Value | 1,125,436 | 821,346
Municipal debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 631,015 | 585,047
Unrealized Gains | 1,596 | 6,660
Unrealized Losses | (49,110) | (44,449)
Fair Value | 583,501 | 547,258
Non-U.S. government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 81,631 | 77,516
Unrealized Gains | 0 | 0
Unrealized Losses | (11,833) | (10,069)
Fair Value | 69,798 | 67,447
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,887,647 | 1,380,533
Unrealized Gains | 1,064 | 4,425
Unrealized Losses | (105,665) | (87,903)
Fair Value | 1,783,046 | 1,297,055
Residential and commercial mortgage securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 519,613 | 571,163
Unrealized Gains | 527 | 286
Unrealized Losses | (42,054) | (53,509)
Fair Value | 478,086 | 517,940
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 642,395 | 584,168
Unrealized Gains | 601 | 203
Unrealized Losses | (11,037) | (19,376)
Fair Value | 631,959 | 564,995
Money market funds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 657,605 | 444,121
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | $ 657,605 | $ 444,121

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