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LIABILITIES FOR INSURANCE PRODUCTS - RECONCILIATION OF NET LIABILITY FOR FUTURE POLICY BENEFITS (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Jun. 30, 2023
Liability for Future Policy Benefit, Activity [Line Items]    
Reserves excluded from rollforward $ 2,465.9 $ 2,601.7
Deferred profit liability 66.8 59.9
Amount of reserves above (below) policyholder account balances (215.7) (448.7)
Future loss reserves 31.1 34.7
Future policy benefits 11,479.4 11,479.6
Supplemental health    
Liability for Future Policy Benefit, Activity [Line Items]    
Adjusted net liability for future policy benefits 3,161.7 3,202.9
Medicare supplement    
Liability for Future Policy Benefit, Activity [Line Items]    
Adjusted net liability for future policy benefits 211.6 223.0
Long-term care    
Liability for Future Policy Benefit, Activity [Line Items]    
Adjusted net liability for future policy benefits 3,147.0 3,191.5
Traditional life    
Liability for Future Policy Benefit, Activity [Line Items]    
Adjusted net liability for future policy benefits 2,329.7 2,305.6
Other annuities    
Liability for Future Policy Benefit, Activity [Line Items]    
Adjusted net liability for future policy benefits $ 281.3 $ 309.0