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Investments - Schedule of Available-For-Sale Securities Disclosure (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Cost/ Amortized Cost	$ 9,089,518		$ 8,476,078
Allowance for Credit Losses	(28,733)	$ (30,175)	(31,948)	$ (31,309)	$ (30,381)	$ (28,212)
Unrealized Gains	97,968		53,285
Unrealized Losses	(282,086)		(370,081)
Fair Value	8,876,667		8,127,334
U.S. government and government agencies
Debt Securities, Available-for-sale [Line Items]
Cost/ Amortized Cost	146,074		139,906
Allowance for Credit Losses	0		0
Unrealized Gains	54		2
Unrealized Losses	(16,687)		(19,753)
Fair Value	129,441		120,155
Foreign government
Debt Securities, Available-for-sale [Line Items]
Cost/ Amortized Cost	11,520		10,656
Allowance for Credit Losses	(21)	(19)	(21)	(26)	(29)	(35)
Unrealized Gains	35		0
Unrealized Losses	(1,011)		(1,333)
Fair Value	10,523		9,302
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Cost/ Amortized Cost	490,639		483,609
Allowance for Credit Losses	(390)	(419)	(570)	(639)	(695)	(669)
Unrealized Gains	1,271		550
Unrealized Losses	(32,862)		(32,359)
Fair Value	458,658		451,230
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Cost/ Amortized Cost	3,356,690		3,181,046
Allowance for Credit Losses	(9,571)	(12,616)	(14,924)	(15,950)	(15,442)	(12,999)
Unrealized Gains	54,889		25,259
Unrealized Losses	(87,916)		(123,201)
Fair Value	3,314,092		3,068,180
Collateralized loan obligations ("CLO") and other asset-backed securities ("ABS")
Debt Securities, Available-for-sale [Line Items]
Cost/ Amortized Cost	2,294,816		2,065,611
Allowance for Credit Losses	(7,230)	(5,499)	(4,889)	(3,022)	(2,627)	(2,854)
Unrealized Gains	27,345		22,116
Unrealized Losses	(38,751)		(49,689)
Fair Value	2,276,180		2,033,149
Residential mortgage-backed securities ("RMBS")
Debt Securities, Available-for-sale [Line Items]
Cost/ Amortized Cost	2,029,324		1,812,744
Allowance for Credit Losses	(11,422)	(11,342)	(11,544)	(11,660)	(11,580)	(11,649)
Unrealized Gains	10,438		3,880
Unrealized Losses	(84,773)		(112,722)
Fair Value	1,943,567		1,692,358
Commercial mortgage-backed securities ("CMBS")
Debt Securities, Available-for-sale [Line Items]
Cost/ Amortized Cost	760,455		782,506
Allowance for Credit Losses	(99)	$ (280)	0	$ (12)	$ (8)	$ (6)
Unrealized Gains	3,936		1,478
Unrealized Losses	(20,086)		(31,024)
Fair Value	$ 744,206		$ 752,960

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