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v3.26.1

Investments (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 5,897,961 | $ 5,944,001
Gross Unrealized Gains | 35,884 | 61,897
Gross Unrealized Losses | (230,724) | (214,667)
Fair Value | 5,703,121 | 5,791,231
Assets held by insurance regulatory requirements | 12,500 | 12,600
Assets held in trust for the benefit of contractual counterparties | 173,900 | 185,700
U.S. Treasury securities and obligations of U.S. government corporations and agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 236,034 | 279,359
Gross Unrealized Gains | 316 | 958
Gross Unrealized Losses | (2,720) | (2,505)
Fair Value | 233,630 | 277,812
Obligations of U.S. states and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,902,497 | 1,961,841
Gross Unrealized Gains | 8,232 | 10,958
Gross Unrealized Losses | (138,321) | (134,035)
Fair Value | 1,772,408 | 1,838,764
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,727,634 | 2,712,348
Gross Unrealized Gains | 19,830 | 36,781
Gross Unrealized Losses | (67,327) | (57,857)
Fair Value | 2,680,137 | 2,691,272
ABS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 263,392 | 225,478
Gross Unrealized Gains | 1,367 | 2,418
Gross Unrealized Losses | (2,118) | (1,335)
Fair Value | 262,641 | 226,561
RMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 361,981 | 366,671
Gross Unrealized Gains | 5,212 | 8,169
Gross Unrealized Losses | (16,483) | (16,816)
Fair Value | 350,710 | 358,024
CMBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 261,115 | 237,974
Gross Unrealized Gains | 919 | 2,484
Gross Unrealized Losses | (3,117) | (1,675)
Fair Value | 258,917 | 238,783
CLOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 131,422 | 99,182
Gross Unrealized Gains | 8 | 129
Gross Unrealized Losses | (209) | (24)
Fair Value | 131,221 | 99,287
Foreign government debt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 4,488 | 4,487
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (429) | (420)
Fair Value | 4,059 | 4,067
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 9,398 | 56,661
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | $ 9,398 | $ 56,661

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