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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
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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

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