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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 | Mar. 31, 2026 | Mar. 31, 2025
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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) | 305.0 | 324.1
Expected future benefits and expenses (Discounted) | 254.5 | 262.4
Supplemental health |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums (Undiscounted) | 9,162.1 | 9,028.5
Expected future gross premiums (Discounted) | 5,610.5 | 5,543.1
Expected future benefits and expenses (Undiscounted) | 10,865.4 | 11,079.0
Expected future benefits and expenses (Discounted) | 5,921.6 | 5,937.0
Medicare supplement |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums (Undiscounted) | 7,492.9 | 6,484.6
Expected future gross premiums (Discounted) | 5,009.8 | 4,427.0
Expected future benefits and expenses (Undiscounted) | 6,032.0 | 5,187.4
Expected future benefits and expenses (Discounted) | 4,025.7 | 3,522.4
Long-term care |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums (Undiscounted) | 3,729.2 | 3,508.9
Expected future gross premiums (Discounted) | 2,563.3 | 2,437.8
Expected future benefits and expenses (Undiscounted) | 8,207.3 | 7,967.7
Expected future benefits and expenses (Discounted) | 4,333.1 | 4,279.6
Traditional life |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums (Undiscounted) | 5,735.0 | 5,681.9
Expected future gross premiums (Discounted) | 4,199.1 | 4,077.6
Expected future benefits and expenses (Undiscounted) | 7,635.2 | 7,616.2
Expected future benefits and expenses (Discounted) | $ 4,605.7 | $ 4,602.3

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