Percentage of fixed maturities by component at fair value.

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) and investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Investments - Schedule of Fixed Maturities Available for Sale by Component (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]
Amortized Cost	$ 18,959,797		$ 18,835,809
Allowance for Credit Losses	(10,355)	$ (10,355)	(10,395)	$ (7,132)	$ (7,027)	$ (7,115)
Gross Unrealized Gains	325,565		254,587
Gross Unrealized Losses	(1,909,653)		(1,924,989)
Fair value	$ 17,365,354		$ 17,155,012
Percentage of total fixed maturities (as a percent)	100.00%		100.00%
U.S. Government direct, guaranteed, and government-sponsored enterprises
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 411,371		$ 401,753
Allowance for Credit Losses	0		0
Gross Unrealized Gains	131		1
Gross Unrealized Losses	(31,467)		(42,794)
Fair value	$ 380,035		$ 358,960
Percentage of total fixed maturities (as a percent)	2.00%		2.00%
States, municipalities, and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 3,303,151		$ 3,300,901
Allowance for Credit Losses	0		0
Gross Unrealized Gains	23,550		20,662
Gross Unrealized Losses	(633,924)		(534,759)
Fair value	$ 2,692,777		$ 2,786,804
Percentage of total fixed maturities (as a percent)	16.00%		16.00%
Foreign governments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 39,427		$ 36,883
Allowance for Credit Losses	0		0
Gross Unrealized Gains	21		18
Gross Unrealized Losses	(9,842)		(8,870)
Fair value	$ 29,606		$ 28,031
Percentage of total fixed maturities (as a percent)	0.00%		0.00%
Corporates
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 15,126,385		$ 14,976,815
Allowance for Credit Losses	(7,058)		(7,098)
Gross Unrealized Gains	301,749		227,924
Gross Unrealized Losses	(1,233,610)		(1,336,380)
Fair value	$ 14,187,466		$ 13,861,261
Percentage of total fixed maturities (as a percent)	82.00%		81.00%
Corporates \| Industrials
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 8,007,486		$ 7,889,074
Allowance for Credit Losses	(7,058)		(7,098)
Gross Unrealized Gains	138,507		105,610
Gross Unrealized Losses	(737,473)		(805,330)
Fair value	$ 7,401,462		$ 7,182,256
Percentage of total fixed maturities (as a percent)	43.00%		42.00%
Corporates \| Financial
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 5,004,947		$ 5,006,375
Allowance for Credit Losses	0		0
Gross Unrealized Gains	107,285		82,598
Gross Unrealized Losses	(386,613)		(413,043)
Fair value	$ 4,725,619		$ 4,675,930
Percentage of total fixed maturities (as a percent)	27.00%		27.00%
Corporates \| Utilities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 2,113,952		$ 2,081,366
Allowance for Credit Losses	0		0
Gross Unrealized Gains	55,957		39,716
Gross Unrealized Losses	(109,524)		(118,007)
Fair value	$ 2,060,385		$ 2,003,075
Percentage of total fixed maturities (as a percent)	12.00%		12.00%
Collateralized debt obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 0		$ 36,923
Allowance for Credit Losses	0		0
Gross Unrealized Gains	0		5,943
Gross Unrealized Losses	0		0
Fair value	$ 0		$ 42,866
Percentage of total fixed maturities (as a percent)	0.00%		0.00%
Other asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 79,463		$ 82,534
Allowance for Credit Losses	(3,297)		(3,297)
Gross Unrealized Gains	114		39
Gross Unrealized Losses	(810)		(2,186)
Fair value	$ 75,470		$ 77,090
Percentage of total fixed maturities (as a percent)	0.00%		1.00%