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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
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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

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