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Investments - Schedule of Unrealized Investment Losses by Class of Investment (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than Twelve Months | $ 2,107,474 | $ 3,886,032
Unrealized Loss, Less than Twelve Months | (67,304) | (183,665)
Fair Value, Twelve Months or Longer | 8,066,918 | 8,001,246
Unrealized Loss, Twelve Months or Longer | (1,522,402) | (1,741,324)
Fair Value | 10,174,392 | 11,887,278
Unrealized Loss | (1,589,706) | (1,924,989)
Investment grade securities: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than Twelve Months | 2,091,985 | 3,809,580
Unrealized Loss, Less than Twelve Months | (67,084) | (179,843)
Fair Value, Twelve Months or Longer | 7,804,453 | 7,705,596
Unrealized Loss, Twelve Months or Longer | (1,476,763) | (1,671,119)
Fair Value | 9,896,438 | 11,515,176
Unrealized Loss | (1,543,847) | (1,850,962)
Investment grade securities: | U.S. Government direct, guaranteed, and government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than Twelve Months | 4,965 | 11,268
Unrealized Loss, Less than Twelve Months | (427) | (290)
Fair Value, Twelve Months or Longer | 364,054 | 347,527
Unrealized Loss, Twelve Months or Longer | (26,360) | (42,504)
Fair Value | 369,019 | 358,795
Unrealized Loss | (26,787) | (42,794)
Investment grade securities: | States, municipalities, and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than Twelve Months | 672,993 | 778,244
Unrealized Loss, Less than Twelve Months | (22,163) | (32,894)
Fair Value, Twelve Months or Longer | 1,553,082 | 1,532,264
Unrealized Loss, Twelve Months or Longer | (523,566) | (501,865)
Fair Value | 2,226,075 | 2,310,508
Unrealized Loss | (545,729) | (534,759)
Investment grade securities: | Foreign governments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than Twelve Months | 0 | 0
Unrealized Loss, Less than Twelve Months | 0 | 0
Fair Value, Twelve Months or Longer | 25,536 | 24,925
Unrealized Loss, Twelve Months or Longer | (8,195) | (8,870)
Fair Value | 25,536 | 24,925
Unrealized Loss | (8,195) | (8,870)
Investment grade securities: | Corporates |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than Twelve Months | 1,414,027 | 2,996,837
Unrealized Loss, Less than Twelve Months | (44,494) | (146,564)
Fair Value, Twelve Months or Longer | 5,841,900 | 5,758,241
Unrealized Loss, Twelve Months or Longer | (917,689) | (1,115,789)
Fair Value | 7,255,927 | 8,755,078
Unrealized Loss | (962,183) | (1,262,353)
Investment grade securities: | Corporates | Industrials |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than Twelve Months | 922,896 | 1,487,940
Unrealized Loss, Less than Twelve Months | (35,073) | (73,404)
Fair Value, Twelve Months or Longer | 3,407,713 | 3,433,034
Unrealized Loss, Twelve Months or Longer | (541,272) | (690,920)
Fair Value | 4,330,609 | 4,920,974
Unrealized Loss | (576,345) | (764,324)
Investment grade securities: | Corporates | Financial |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than Twelve Months | 365,328 | 961,932
Unrealized Loss, Less than Twelve Months | (6,994) | (52,946)
Fair Value, Twelve Months or Longer | 1,857,967 | 1,785,130
Unrealized Loss, Twelve Months or Longer | (296,388) | (333,873)
Fair Value | 2,223,295 | 2,747,062
Unrealized Loss | (303,382) | (386,819)
Investment grade securities: | Corporates | Utilities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than Twelve Months | 125,803 | 546,965
Unrealized Loss, Less than Twelve Months | (2,427) | (20,214)
Fair Value, Twelve Months or Longer | 576,220 | 540,077
Unrealized Loss, Twelve Months or Longer | (80,029) | (90,996)
Fair Value | 702,023 | 1,087,042
Unrealized Loss | (82,456) | (111,210)
Investment grade securities: | Other asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than Twelve Months | 0 | 23,231
Unrealized Loss, Less than Twelve Months | 0 | (95)
Fair Value, Twelve Months or Longer | 19,881 | 42,639
Unrealized Loss, Twelve Months or Longer | (953) | (2,091)
Fair Value | 19,881 | 65,870
Unrealized Loss | (953) | (2,186)
Below investment grade securities: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than Twelve Months | 15,489 | 76,452
Unrealized Loss, Less than Twelve Months | (220) | (3,822)
Fair Value, Twelve Months or Longer | 262,465 | 295,650
Unrealized Loss, Twelve Months or Longer | (45,639) | (70,205)
Fair Value | 277,954 | 372,102
Unrealized Loss | (45,859) | (74,027)
Below investment grade securities: | Corporates |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than Twelve Months | 15,489 | 76,452
Unrealized Loss, Less than Twelve Months | (220) | (3,822)
Fair Value, Twelve Months or Longer | 262,465 | 293,452
Unrealized Loss, Twelve Months or Longer | (45,639) | (70,205)
Fair Value | 277,954 | 369,904
Unrealized Loss | (45,859) | (74,027)
Below investment grade securities: | Corporates | Industrials |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than Twelve Months | 4,963 | 54,199
Unrealized Loss, Less than Twelve Months | (38) | (2,656)
Fair Value, Twelve Months or Longer | 129,216 | 142,638
Unrealized Loss, Twelve Months or Longer | (25,452) | (38,350)
Fair Value | 134,179 | 196,837
Unrealized Loss | (25,490) | (41,006)
Below investment grade securities: | Corporates | Financial |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than Twelve Months | 3,054 | 2,990
Unrealized Loss, Less than Twelve Months | (17) | (53)
Fair Value, Twelve Months or Longer | 96,349 | 126,811
Unrealized Loss, Twelve Months or Longer | (15,461) | (26,171)
Fair Value | 99,403 | 129,801
Unrealized Loss | (15,478) | (26,224)
Below investment grade securities: | Corporates | Utilities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than Twelve Months | 7,472 | 19,263
Unrealized Loss, Less than Twelve Months | (165) | (1,113)
Fair Value, Twelve Months or Longer | 36,900 | 24,003
Unrealized Loss, Twelve Months or Longer | (4,726) | (5,684)
Fair Value | 44,372 | 43,266
Unrealized Loss | (4,891) | (6,797)
Below investment grade securities: | Other asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than Twelve Months | 0 | 0
Unrealized Loss, Less than Twelve Months | 0 | 0
Fair Value, Twelve Months or Longer | 0 | 2,198
Unrealized Loss, Twelve Months or Longer | 0 | 0
Fair Value | 0 | 2,198
Unrealized Loss | $ 0 | $ 0

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