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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, 2025 | Mar. 31, 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) | 324.1 | 370.6
Expected future benefits and expenses (Discounted) | 262.4 | 298.9
Supplemental health |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums (Undiscounted) | 9,028.5 | 8,932.2
Expected future gross premiums (Discounted) | 5,543.1 | 5,527.6
Expected future benefits and expenses (Undiscounted) | 11,079.0 | 10,812.6
Expected future benefits and expenses (Discounted) | 5,937.0 | 5,897.0
Medicare supplement |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums (Undiscounted) | 6,484.6 | 5,744.3
Expected future gross premiums (Discounted) | 4,427.0 | 4,024.7
Expected future benefits and expenses (Undiscounted) | 5,187.4 | 4,601.3
Expected future benefits and expenses (Discounted) | 3,522.4 | 3,198.7
Long-term care |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums (Undiscounted) | 3,508.9 | 3,330.8
Expected future gross premiums (Discounted) | 2,437.8 | 2,340.7
Expected future benefits and expenses (Undiscounted) | 7,967.7 | 7,724.0
Expected future benefits and expenses (Discounted) | 4,279.6 | 4,274.7
Traditional life |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums (Undiscounted) | 5,681.9 | 5,642.0
Expected future gross premiums (Discounted) | 4,077.6 | 4,048.0
Expected future benefits and expenses (Undiscounted) | 7,616.2 | 7,574.2
Expected future benefits and expenses (Discounted) | $ 4,602.3 | $ 4,620.1

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