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INVESTMENTS - TOTAL INVESTMENT GAINS (LOSSES) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Realized investment gains (losses):        
Total realized investment losses $ (12,900,000) $ (13,100,000) $ (38,000,000.0) $ (49,400,000)
Change in allowance for credit losses 8,000,000.0 1,600,000 (2,600,000) 7,200,000
Change in fair value of equity securities 1,400,000 2,800,000 3,500,000 3,000,000.0
Other changes in fair value 500,000 9,800,000 8,900,000 27,100,000
Gain on liquidation of variable interest entities 0 100,000 0 3,900,000
Other investment gains (losses) 9,900,000 14,300,000 9,800,000 41,200,000
Total investment gains (losses) (3,000,000.0) 1,200,000 (28,200,000) (8,200,000)
Increase (decrease) in equity securities, FV-NI, held at end of period 1,700,000 2,800,000 5,900,000 3,100,000
Change in estimated fair value of trading securities 3,000,000.0 6,100,000 10,100,000 10,800,000
Embedded Derivative Related to Fixed Maturity Securities        
Realized investment gains (losses):        
Increase (decrease) in fair value of certain fixed maturity investments with embedded derivatives 0 8,100,000 7,100,000 25,200,000
Reinsurance Contract | Coinsurance        
Realized investment gains (losses):        
Increase (decrease) in fair value of certain fixed maturity investments with embedded derivatives 500,000 1,700,000 1,800,000 1,900,000
Total Fixed Maturities, Available For Sale        
Realized investment gains (losses):        
Gross realized gains on sales of fixed maturities, available for sale 1,900,000 6,300,000 4,800,000 9,300,000
Gross realized losses on sales of fixed maturities, available for sale (18,100,000) (12,800,000) (42,700,000) (46,300,000)
Equity securities, net 700,000 0 200,000 (100,000)
Other, net $ 2,600,000 $ (6,600,000) $ (300,000) $ (12,300,000)