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LIABILITIES FOR INSURANCE PRODUCTS - RECONCILIATION OF NET LIABILITY FOR FUTURE POLICY BENEFITS (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Sep. 30, 2022
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Liability for Future Policy Benefit, Activity [Line Items] |  |
Reserves excluded from rollforward | $ 2,574.0 | $ 2,616.1
Deferred profit liability | 60.8 | 50.4
Amount of reserves above (below) policyholder account balances | (454.7) | (569.8)
Future loss reserves | 34.6 | 34.1
Future policy benefits | 10,829.9 | 10,815.5
Supplemental health |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Adjusted net liability for future policy benefits | 2,966.8 | 2,988.5
Medicare supplement |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Adjusted net liability for future policy benefits | 208.9 | 233.2
Long-term care |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Adjusted net liability for future policy benefits | 2,977.2 | 3,031.6
Traditional life |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Adjusted net liability for future policy benefits | 2,175.1 | 2,126.9
Other annuities |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Adjusted net liability for future policy benefits | $ 287.2 | $ 304.5

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