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Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 6,161,970	$ 6,061,022
Gross Unrealized Gains	62,139	28,235
Gross Unrealized Losses	(260,044)	(366,144)
Fair Value	5,964,065	5,723,113
Assets held by insurance regulatory requirements	12,500	12,200
Assets held in trust for the benefit of contractual counterparties	198,400	156,900
U.S. Treasury securities and obligations of U.S. government corporations and agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	257,572	167,995
Gross Unrealized Gains	741	51
Gross Unrealized Losses	(4,019)	(6,364)
Fair Value	254,294	161,682
Obligations of U.S. states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,066,711	2,092,754
Gross Unrealized Gains	7,881	5,159
Gross Unrealized Losses	(144,890)	(189,835)
Fair Value	1,929,702	1,908,078
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,774,109	2,626,401
Gross Unrealized Gains	40,041	17,391
Gross Unrealized Losses	(84,005)	(128,211)
Fair Value	2,730,145	2,515,581
ABS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	156,008	173,256
Gross Unrealized Gains	3,339	1,292
Gross Unrealized Losses	(1,397)	(3,275)
Fair Value	157,950	171,273
RMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	379,184	347,132
Gross Unrealized Gains	9,467	4,297
Gross Unrealized Losses	(18,216)	(20,656)
Fair Value	370,435	330,773
CMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	270,014	293,204
Gross Unrealized Gains	449	5
Gross Unrealized Losses	(6,927)	(15,752)
Fair Value	263,536	277,457
CLOs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	236,816	327,467
Gross Unrealized Gains	221	37
Gross Unrealized Losses	(53)	(1,408)
Fair Value	236,984	326,096
Foreign government debt
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,487	4,486
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(537)	(643)
Fair Value	3,950	3,843
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	17,069	28,327
Gross Unrealized Gains	0	3
Gross Unrealized Losses	0	0
Fair Value	$ 17,069	$ 28,330

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