v3.26.1
Supplemental Information about Changes to Accumulated Other Comprehensive Income (Loss) - Schedule of Change in Balance by Component (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance $ 6,084,596 $ 5,425,416 $ 5,974,579 $ 5,305,520
Other comprehensive income (loss) before reclassifications, net of tax (17,377) (21,418) 53,268 40,015
Reclassifications, net of tax (3,561) 8,423 (3,553) 5,837
Other comprehensive income (loss) (20,938) (12,995) 49,715 45,852
Ending balance 6,155,815 5,419,030 6,155,815 5,419,030
Total        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (1,700,791) (1,970,873) (1,771,444) (2,029,720)
Ending balance (1,721,729) (1,983,868) (1,721,729) (1,983,868)
Available for Sale Assets        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (1,225,064) (1,152,648) (969,982) (1,319,618)
Other comprehensive income (loss) before reclassifications, net of tax 151,301 (107,155) (102,542) 62,454
Reclassifications, net of tax (3,647) 8,376 (4,886) 5,737
Other comprehensive income (loss) 147,654 (98,779) (107,428) 68,191
Ending balance (1,077,410) (1,251,427) (1,077,410) (1,251,427)
Future Policy Benefits        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (497,370) (819,131) (821,628) (709,042)
Other comprehensive income (loss) before reclassifications, net of tax (159,429) 72,862 164,829 (37,227)
Reclassifications, net of tax 0 0 0 0
Other comprehensive income (loss) (159,429) 72,862 164,829 (37,227)
Ending balance (656,799) (746,269) (656,799) (746,269)
Foreign Exchange        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (8,814) (19,844) (9,044) (21,757)
Other comprehensive income (loss) before reclassifications, net of tax (9,249) 12,875 (9,019) 14,788
Reclassifications, net of tax 0 0 0 0
Other comprehensive income (loss) (9,249) 12,875 (9,019) 14,788
Ending balance (18,063) (6,969) (18,063) (6,969)
Pension Adjustments        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance 30,457 20,750 29,210 20,697
Other comprehensive income (loss) before reclassifications, net of tax 0 0 0 0
Reclassifications, net of tax 86 47 1,333 100
Other comprehensive income (loss) 86 47 1,333 100
Ending balance $ 30,543 $ 20,797 $ 30,543 $ 20,797