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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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