Business Segments - Schedule of Assets by Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting, Asset Reconciling Item [Line Items]
Accrued investment income	$ 272,818	$ 269,791
Deferred acquisition costs	6,999,136	6,495,589	$ 6,009,477
Goodwill	490,446	490,446
Total assets	30,813,692	29,076,181
Life
Segment Reporting, Asset Reconciling Item [Line Items]
Deferred acquisition costs	6,147,750	5,700,755	5,271,775	$ 4,844,291
Health
Segment Reporting, Asset Reconciling Item [Line Items]
Deferred acquisition costs	851,386	793,421	$ 734,735	$ 686,763
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and invested assets	20,614,713	19,736,888
Accrued investment income	272,818	269,791
Deferred acquisition costs	6,999,136	6,494,176
Goodwill	490,446	490,446
Total segment assets	28,377,113	26,991,301
Operating Segments | Life
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and invested assets	0	0
Accrued investment income	0	0
Deferred acquisition costs	6,147,750	5,700,755
Goodwill	309,609	309,609
Total segment assets	6,457,359	6,010,364
Operating Segments | Health
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and invested assets	0	0
Accrued investment income	0	0
Deferred acquisition costs	851,386	793,421
Goodwill	180,837	180,837
Total segment assets	1,032,223	974,258
Operating Segments | Investment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and invested assets	20,614,713	19,736,888
Accrued investment income	272,818	269,791
Deferred acquisition costs	0	0
Goodwill	0	0
Total segment assets	20,887,531	20,006,679
Corporate & Other
Segment Reporting, Asset Reconciling Item [Line Items]
Annuity and other corporate	$ 2,436,579	$ 2,084,880