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INVESTMENTS - TOTAL INVESTMENT GAINS (LOSSES) (Details) - USD ($)
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Realized investment gains (losses):    
Total realized investment losses $ (7,800,000) $ (3,800,000)
Change in allowance for credit losses and write-downs (9,600,000) (9,600,000)
Change in fair value of equity securities (2,000,000.0) (2,500,000)
Other changes in fair value (3,300,000) 9,100,000
Other investment losses (14,900,000) (3,000,000.0)
Total investment losses (22,700,000) (6,800,000)
Increase (decrease) in equity securities, FV-NI, held at end of period (3,600,000) 400,000
Change in estimated fair value of trading securities (3,300,000) 5,800,000
Embedded Derivative Related to Fixed Maturity Securities    
Realized investment gains (losses):    
Increase (decrease) in fair value of certain fixed maturity investments with embedded derivatives (2,900,000) 7,900,000
Reinsurance Contract | Coinsurance    
Realized investment gains (losses):    
Increase (decrease) in fair value of certain fixed maturity investments with embedded derivatives (400,000) 1,200,000
Total fixed maturities, available for sale    
Realized investment gains (losses):    
Gross realized gains on sales of fixed maturities, available for sale 52,200,000 1,000,000.0
Gross realized losses on sales of fixed maturities, available for sale (56,300,000) (2,800,000)
Equity securities, net (1,900,000) 0
Other, net $ (1,800,000) $ (2,000,000.0)