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Investments - Schedule of Available-For-Sale Securities Disclosure (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Mar. 31, 2026	Dec. 31, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Cost/ Amortized Cost	$ 10,131,816		$ 9,576,878
Allowance for Credit Losses	(39,102)	$ (38,819)	(31,287)	$ (28,733)	$ (30,175)	$ (31,948)
Unrealized Gains	69,241		133,703
Unrealized Losses	(252,202)		(222,118)
Fair Value	9,909,753		9,457,176
U.S. government and government agencies
Debt Securities, Available-for-sale [Line Items]
Cost/ Amortized Cost	175,656		177,877
Allowance for Credit Losses	0		0
Unrealized Gains	21		108
Unrealized Losses	(15,984)		(14,778)
Fair Value	159,693		163,207
Foreign government
Debt Securities, Available-for-sale [Line Items]
Cost/ Amortized Cost	17,113		10,768
Allowance for Credit Losses	(79)	(12)	(16)	(21)	(19)	(21)
Unrealized Gains	26		47
Unrealized Losses	(890)		(797)
Fair Value	16,170		10,002
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Cost/ Amortized Cost	558,518		567,757
Allowance for Credit Losses	(305)	(305)	(259)	(390)	(419)	(570)
Unrealized Gains	6,924		6,342
Unrealized Losses	(22,450)		(23,883)
Fair Value	542,687		549,957
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Cost/ Amortized Cost	3,699,163		3,409,875
Allowance for Credit Losses	(12,398)	(13,065)	(7,691)	(9,571)	(12,616)	(14,924)
Unrealized Gains	34,161		73,842
Unrealized Losses	(78,950)		(71,862)
Fair Value	3,641,976		3,404,164
Collateralized loan obligations ("CLO") and other asset-backed securities ("ABS")
Debt Securities, Available-for-sale [Line Items]
Cost/ Amortized Cost	2,656,921		2,570,451
Allowance for Credit Losses	(14,917)	(14,029)	(11,902)	(7,230)	(5,499)	(4,889)
Unrealized Gains	15,754		26,596
Unrealized Losses	(42,384)		(34,859)
Fair Value	2,615,374		2,550,286
Residential mortgage-backed securities ("RMBS")
Debt Securities, Available-for-sale [Line Items]
Cost/ Amortized Cost	2,361,588		2,127,004
Allowance for Credit Losses	(11,394)	(11,393)	(11,284)	(11,422)	(11,342)	(11,544)
Unrealized Gains	10,522		21,547
Unrealized Losses	(76,017)		(61,334)
Fair Value	2,284,699		2,075,933
Commercial mortgage-backed securities ("CMBS")
Debt Securities, Available-for-sale [Line Items]
Cost/ Amortized Cost	662,857		713,146
Allowance for Credit Losses	(9)	$ (15)	(135)	$ (99)	$ (280)	$ 0
Unrealized Gains	1,833		5,221
Unrealized Losses	(15,527)		(14,605)
Fair Value	$ 649,154		$ 703,627