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SHAREHOLDERS' EQUITY - SCHEDULE OF ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
Sep. 30, 2025
Dec. 31, 2024
Equity [Abstract]    
Net unrealized losses on investments having no allowance for credit losses $ (628,100,000) $ (1,281,600,000)
Unrealized losses on investments with an allowance for credit losses (1,155,500,000) (1,108,700,000)
Change in discount rates for liability for future policy benefits 340,700,000 624,500,000
Change in instrument-specific credit risk for market risk benefits 800,000 1,400,000
Deferred income tax assets 323,200,000 393,000,000.0
Accumulated other comprehensive loss (1,118,900,000) (1,371,400,000)
Amortized cost 39,900,000  
Total fixed maturities, available for sale $ 41,100,000 $ 0