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Liability for Future Policyholder Benefits - Reconciliation of the Net Liability for Future Benefits to Life and Health Insurance Reserves (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Insurance [Abstract]            
Net Liability for Future Policyholder Benefits, post-flooring $ 2,730,800 $ 2,897,500 $ 2,730,800 $ 2,897,500    
Deferred Profit Liability 460,400 390,600 460,400 390,600 $ 412,100 $ 337,800
A&H and Other Reserves 126,400 137,700 126,400 137,700    
Total Life and Health Insurance Reserves 3,317,600 3,425,800 3,317,600 3,425,800    
Term Life Insurance            
Liability for Future Policy Benefit, by Product Segment [Line Items]            
Net Liability for Future Policyholder Benefits, post-flooring 10,167,100 10,274,000 10,167,100 10,274,000    
Expected Future Gross Premiums, undiscounted 4,010,900 4,159,000 4,010,900 4,159,000    
Expected Future Gross Premiums, discounted 2,718,200 2,853,800 2,718,200 2,853,800    
Gross Premiums or Assessments 99,200 99,800 299,700 300,300    
Interest Expense $ 34,600 $ 35,000 $ 103,700 $ 104,700    
Interest Accretion Rate 4.53% 4.54% 4.53% 4.54%    
Current Discount Rate 5.57% 5.17% 5.57% 5.17%