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LIABILITIES FOR INSURANCE PRODUCTS - SUMMARY OF AMOUNT OF UNDISCOUNTED AND DISCOUNTED EXPECTED GROSS PREMIUMS AND EXPECTED FUTURE BENEFITS (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Sep. 30, 2022
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Other annuities |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums (Undiscounted) | $ 0.0 | $ 0.0
Expected future gross premiums (Discounted) | 0.0 | 0.0
Future policy benefits | 385.9 | 409.3
Expected future benefits and expenses (Discounted) | 287.2 | 304.5
Supplemental health |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums (Undiscounted) | 9,031.2 | 8,866.2
Expected future gross premiums (Discounted) | 5,287.4 | 5,310.3
Future policy benefits | 10,163.1 | 10,948.7
Expected future benefits and expenses (Discounted) | 5,635.3 | 5,686.2
Medicare supplement |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums (Undiscounted) | 5,589.1 | 5,521.0
Expected future gross premiums (Discounted) | 3,756.3 | 3,857.2
Future policy benefits | 4,387.4 | 4,318.6
Expected future benefits and expenses (Discounted) | 2,933.1 | 2,998.8
Long-term care |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums (Undiscounted) | 2,967.0 | 2,974.1
Expected future gross premiums (Discounted) | 2,054.0 | 2,097.9
Future policy benefits | 7,483.6 | 7,546.5
Expected future benefits and expenses (Discounted) | 3,974.6 | 4,069.4
Traditional life |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums (Undiscounted) | 5,542.6 | 5,448.2
Expected future gross premiums (Discounted) | 3,840.1 | 3,835.7
Future policy benefits | 7,478.6 | 7,250.8
Expected future benefits and expenses (Discounted) | $ 4,320.8 | $ 4,271.7

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