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Investments - Schedule of Available-For-Sale Securities Disclosure (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Cost/ Amortized Cost	$ 8,269,338		$ 7,880,697
Allowance for Credit Losses	(28,504)	$ (31,309)	(28,212)	$ (33,538)	$ (31,425)	$ (45,721)
Unrealized Gains	107,715		50,076
Unrealized Losses	(259,948)		(403,364)
Fair Value	8,088,601		7,499,197
U.S. government and government agencies
Debt Securities, Available-for-sale [Line Items]
Cost/ Amortized Cost	139,877		223,157
Allowance for Credit Losses	0		0
Unrealized Gains	106		139
Unrealized Losses	(14,581)		(18,261)
Fair Value	125,402		205,035
Foreign government
Debt Securities, Available-for-sale [Line Items]
Cost/ Amortized Cost	10,671		11,140
Allowance for Credit Losses	(24)	(26)	(35)	(32)	(34)	(284)
Unrealized Gains	0		0
Unrealized Losses	(985)		(1,302)
Fair Value	9,662		9,803
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Cost/ Amortized Cost	512,086		612,938
Allowance for Credit Losses	(472)	(639)	(669)	(892)	(769)	(1,024)
Unrealized Gains	2,865		2,623
Unrealized Losses	(21,623)		(28,927)
Fair Value	492,856		585,965
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Cost/ Amortized Cost	3,067,267		2,834,048
Allowance for Credit Losses	(12,034)	(15,950)	(12,999)	(17,765)	(16,149)	(30,330)
Unrealized Gains	58,570		28,078
Unrealized Losses	(87,018)		(137,888)
Fair Value	3,026,785		2,711,239
Collateralized loan obligations ("CLO") and other asset-backed securities ("ABS")
Debt Securities, Available-for-sale [Line Items]
Cost/ Amortized Cost	1,971,489		1,911,831
Allowance for Credit Losses	(4,462)	(3,022)	(2,854)	(3,218)	(2,915)	(2,375)
Unrealized Gains	28,036		11,855
Unrealized Losses	(48,670)		(86,005)
Fair Value	1,946,393		1,834,827
Residential mortgage-backed securities ("RMBS")
Debt Securities, Available-for-sale [Line Items]
Cost/ Amortized Cost	1,801,760		1,568,960
Allowance for Credit Losses	(11,509)	(11,660)	(11,649)	(11,625)	(11,550)	(11,597)
Unrealized Gains	13,319		6,023
Unrealized Losses	(63,561)		(85,851)
Fair Value	1,740,009		1,477,483
Commercial mortgage-backed securities ("CMBS")
Debt Securities, Available-for-sale [Line Items]
Cost/ Amortized Cost	766,188		718,623
Allowance for Credit Losses	(3)	$ (12)	(6)	$ (6)	$ (8)	$ (111)
Unrealized Gains	4,819		1,358
Unrealized Losses	(23,510)		(45,130)
Fair Value	$ 747,494		$ 674,845

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