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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, 2025 | Sep. 30, 2024
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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
Expected future benefits and expenses (Undiscounted) | 312.8 | 337.6
Expected future benefits and expenses (Discounted) | 263.9 | 285.0
Supplemental health |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums (Undiscounted) | 9,098.7 | 8,980.6
Expected future gross premiums (Discounted) | 5,687.4 | 5,726.1
Expected future benefits and expenses (Undiscounted) | 10,781.4 | 10,901.9
Expected future benefits and expenses (Discounted) | 6,012.0 | 6,149.3
Medicare supplement |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums (Undiscounted) | 6,930.0 | 5,968.3
Expected future gross premiums (Discounted) | 4,753.6 | 4,244.2
Expected future benefits and expenses (Undiscounted) | 5,565.5 | 4,758.4
Expected future benefits and expenses (Discounted) | 3,808.0 | 3,365.9
Long-term care |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums (Undiscounted) | 3,648.8 | 3,462.8
Expected future gross premiums (Discounted) | 2,564.4 | 2,486.9
Expected future benefits and expenses (Undiscounted) | 8,100.0 | 7,881.2
Expected future benefits and expenses (Discounted) | 4,431.5 | 4,470.0
Traditional life |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums (Undiscounted) | 5,804.4 | 5,654.8
Expected future gross premiums (Discounted) | 4,231.0 | 4,162.6
Expected future benefits and expenses (Undiscounted) | 7,680.7 | 7,631.0
Expected future benefits and expenses (Discounted) | $ 4,725.6 | $ 4,786.2

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