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v3.25.1

Investments - Schedule of Fixed Maturity Securities in a Continuous Unrealized Loss Position (Details) $ in Thousands | Mar. 31, 2025 USD ($) security | Dec. 31, 2024 USD ($) security
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Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than 12 months, Fair value | $ 1,158,601 | $ 1,444,660
Less than 12 months, Gross unrealized losses | $ (19,571) | $ (34,364)
Less than 12 months, Number of securities | security | 392 | 544
12 months or more, Fair value | $ 2,432,538 | $ 2,722,049
12 months or more, Gross unrealized losses | $ (194,607) | $ (238,076)
12 months or more, Number of securities | security | 502 | 566
Fair value | $ 3,591,139 | $ 4,166,709
Gross unrealized losses | $ (214,178) | $ (272,440)
Number of securities | security | 894 | 1,110
U.S. government, agencies and GSEs |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than 12 months, Fair value | $ 75,658 | $ 157,596
Less than 12 months, Gross unrealized losses | $ (1,180) | $ (4,704)
Less than 12 months, Number of securities | security | 12 | 32
12 months or more, Fair value | $ 18,126 | $ 19,998
12 months or more, Gross unrealized losses | $ (255) | $ (381)
12 months or more, Number of securities | security | 7 | 9
Fair value | $ 93,784 | $ 177,594
Gross unrealized losses | $ (1,435) | $ (5,085)
Number of securities | security | 19 | 41
State and political subdivisions |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than 12 months, Fair value | $ 47,020 | $ 48,280
Less than 12 months, Gross unrealized losses | $ (2,623) | $ (2,366)
Less than 12 months, Number of securities | security | 11 | 17
12 months or more, Fair value | $ 392,765 | $ 396,638
12 months or more, Gross unrealized losses | $ (63,302) | $ (73,261)
12 months or more, Number of securities | security | 81 | 84
Fair value | $ 439,785 | $ 444,918
Gross unrealized losses | $ (65,925) | $ (75,627)
Number of securities | security | 92 | 101
Non-U.S. government |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than 12 months, Fair value | $ 30,832 | $ 56,631
Less than 12 months, Gross unrealized losses | $ (467) | $ (1,236)
Less than 12 months, Number of securities | security | 45 | 76
12 months or more, Fair value | $ 9,776 | $ 9,692
12 months or more, Gross unrealized losses | $ (502) | $ (622)
12 months or more, Number of securities | security | 1 | 1
Fair value | $ 40,608 | $ 66,323
Gross unrealized losses | $ (969) | $ (1,858)
Number of securities | security | 46 | 77
U.S. corporate |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than 12 months, Fair value | $ 649,982 | $ 881,643
Less than 12 months, Gross unrealized losses | $ (11,504) | $ (20,844)
Less than 12 months, Number of securities | security | 177 | 265
12 months or more, Fair value | $ 1,246,554 | $ 1,379,860
12 months or more, Gross unrealized losses | $ (87,247) | $ (108,740)
12 months or more, Number of securities | security | 232 | 264
Fair value | $ 1,896,536 | $ 2,261,503
Gross unrealized losses | $ (98,751) | $ (129,584)
Number of securities | security | 409 | 529
Non-U.S. corporate |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than 12 months, Fair value | $ 123,572 | $ 195,648
Less than 12 months, Gross unrealized losses | $ (2,410) | $ (4,015)
Less than 12 months, Number of securities | security | 52 | 102
12 months or more, Fair value | $ 313,493 | $ 385,508
12 months or more, Gross unrealized losses | $ (20,818) | $ (26,035)
12 months or more, Number of securities | security | 61 | 74
Fair value | $ 437,065 | $ 581,156
Gross unrealized losses | $ (23,228) | $ (30,050)
Number of securities | security | 113 | 176
Residential mortgage-backed |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than 12 months, Fair value | $ 75,399 | $ 3,313
Less than 12 months, Gross unrealized losses | $ (468) | $ (31)
Less than 12 months, Number of securities | security | 26 | 3
12 months or more, Fair value | $ 2,433 | $ 2,822
12 months or more, Gross unrealized losses | $ (14) | $ (26)
12 months or more, Number of securities | security | 4 | 4
Fair value | $ 77,832 | $ 6,135
Gross unrealized losses | $ (482) | $ (57)
Number of securities | security | 30 | 7
Other asset-backed |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than 12 months, Fair value | $ 156,138 | $ 101,549
Less than 12 months, Gross unrealized losses | $ (919) | $ (1,168)
Less than 12 months, Number of securities | security | 69 | 49
12 months or more, Fair value | $ 449,391 | $ 527,531
12 months or more, Gross unrealized losses | $ (22,469) | $ (29,011)
12 months or more, Number of securities | security | 116 | 130
Fair value | $ 605,529 | $ 629,080
Gross unrealized losses | $ (23,388) | $ (30,179)
Number of securities | security | 185 | 179

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