v3.26.1
Deferred Policy Acquisition Costs - Balances and Activity in DAC Roll Forward (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Deferred Policy Acquisition Cost [Line Items]      
DAC balance, beginning of period $ 3,915,998    
Amortization (84,260) $ (78,550)  
DAC balance, end of period 3,954,334   $ 3,915,998
Term Life Insurance [Member]      
Deferred Policy Acquisition Cost [Line Items]      
DAC balance, beginning of period 3,845,442 3,608,599 3,608,599
Capitalization 127,675   540,952
Amortization (82,666)   (316,411)
Foreign exchange translation and other (4,923)   12,302
DAC balance, end of period 3,885,528   3,845,442
Segregated Funds (Canada) [Member]      
Deferred Policy Acquisition Cost [Line Items]      
DAC balance, beginning of period 55,139 $ 55,303 55,303
Capitalization 815   2,547
Amortization (1,334)   (5,381)
Foreign exchange translation and other (971)   2,670
DAC balance, end of period $ 53,649   $ 55,139