Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Statement of Comprehensive Income [Abstract]
Net income	$ 387,843	$ 302,994	$ 895,155	$ 815,566
Unrealized gains (losses) on fixed maturities:
Unrealized holding gains (losses) arising during period	432,361	869,743	513,171	301,715
Other reclassification adjustments included in net income	9,933	(2,408)	17,195	2,580
Foreign exchange adjustment on fixed maturities recorded at fair value	606	(954)	(1,152)	546
Total unrealized investment gains (losses)	442,900	866,381	529,214	304,841
Less applicable tax (expense) benefit	(93,009)	(181,941)	(111,132)	(64,018)
Unrealized gains (losses) on investments, net of tax	349,891	684,440	418,082	240,823
Future Policy Benefits:
Change in discount rate on future policy benefits	(423,443)	(1,247,366)	(470,566)	63,614
Less applicable tax (expense) benefit	88,924	261,946	98,820	(13,360)
Future policy benefit adjustments, net of tax	(334,519)	(985,420)	(371,746)	50,254
Foreign exchange translation:
Foreign exchange translation adjustments, other than securities	(5,627)	7,296	13,094	(4,660)
Less applicable tax (expense) benefit	1,182	(1,532)	(2,751)	979
Foreign exchange translation adjustments, other than securities, net of tax	(4,445)	5,764	10,343	(3,681)
Pension:
Pension adjustments	64	118	191	354
Less applicable tax (expense) benefit	(14)	(25)	(41)	(74)
Pension adjustments, net of tax	50	93	150	280
Other comprehensive income (loss)	10,977	(295,123)	56,829	287,676
Comprehensive income (loss)	$ 398,820	$ 7,871	$ 951,984	$ 1,103,242