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LIABILITIES FOR INSURANCE PRODUCTS - RECONCILIATION OF NET LIABILITY FOR FUTURE POLICY BENEFITS (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Sep. 30, 2023
Liability for Future Policy Benefit, Activity [Line Items]    
Reserves excluded from rollforward $ 2,445.4 $ 2,574.0
Deferred profit liability 67.4 60.8
Amount of reserves above (below) policyholder account balances (78.6) (454.7)
Future loss reserves 27.4 34.6
Future policy benefits 12,179.6 10,829.9
Supplemental health    
Liability for Future Policy Benefit, Activity [Line Items]    
Adjusted net liability for future policy benefits 3,383.8 2,966.8
Medicare supplement    
Liability for Future Policy Benefit, Activity [Line Items]    
Adjusted net liability for future policy benefits 222.4 208.9
Long-term care    
Liability for Future Policy Benefit, Activity [Line Items]    
Adjusted net liability for future policy benefits 3,339.5 2,977.2
Traditional life    
Liability for Future Policy Benefit, Activity [Line Items]    
Adjusted net liability for future policy benefits 2,487.3 2,175.1
Other annuities    
Liability for Future Policy Benefit, Activity [Line Items]    
Adjusted net liability for future policy benefits $ 285.0 $ 287.2