Investments - Schedule of Realized Gains (Losses) on Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Sales and other	$ (30,447)	$ (11,563)	$ (77,301)
Provision for credit losses	7,098	(3,280)	(7,115)
Fair value option—change in fair value	(10,074)	(16,717)	15,102
Mortgage loans	(2,817)	(3,972)	(5,603)
Other investments	(1,642)	2,936	1,792
Realized gains (losses) from investments	(37,882)	(32,596)	(73,125)
Other gains (losses)	10,094	8,408	7,449
Total realized gains (losses)	(27,788)	(24,188)	(65,676)
Applicable tax	5,836	5,080	13,792
Realized gains (losses), net of tax	(21,952)	(19,108)	(51,884)
Exchanges of fixed maturities	288,500	105,600	50,900
Exchanges of fixed maturities, realized gains (losses)	$ (3,000)	$ 0	(1,900)
Securities sold with a provision for credit losses			$ 66,000