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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
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