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LIABILITIES FOR INSURANCE PRODUCTS - CHANGES IN MARKET RISK BENEFITS (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Market Risk Benefit [Roll Forward]      
Net liability (asset), beginning of period $ 60.0 $ 117.1  
Effect of changes in the instrument-specific credit risk, beginning of period 1.4 4.8  
Balance, beginning of period, before effect of changes in the instrument-specific credit risk 61.4 121.9  
Issuances 3.4 3.2  
Interest accrual 2.0 3.6  
Effect of changes in interest rates 0.9 (13.6)  
Effect of changes in equity markets (0.3) (0.4)  
Effect of changes in equity index volatility 2.2 2.4  
Actual policyholder behavior different from expected behavior (0.6) (0.9)  
Effect of changes in future expected policyholder behavior - other (13.3) (36.3)  
Effect of changes in future expected policyholder behavior - risk margin 0.1 0.2  
Effect of changes in assumptions (2.4) (3.9)  
Net liability (asset), end of period, before effect of changes in the instrument-specific credit risk 53.4 76.2  
Effect of changes in the instrument-specific credit risk, end of period (0.8) (2.1)  
Net liability (asset), end of period 52.6 74.1  
Net liability (asset), end of period, net of reinsurance 52.6 74.1  
Balance reported as an asset 0.0 0.0  
Balance reported as a liability 52.6 74.1 $ 60.0
Net liability (asset) 52.6 74.1 $ 60.0
Net amount at risk $ 22.1 $ 27.6  
Weighted average attained age of contract holders 70 years 69 years