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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 | Jun. 30, 2025 | Jun. 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) | 319.9 | 345.8
Expected future benefits and expenses (Discounted) | 263.5 | 281.3
Supplemental health |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums (Undiscounted) | 9,069.6 | 8,935.0
Expected future gross premiums (Discounted) | 5,587.9 | 5,441.5
Expected future benefits and expenses (Undiscounted) | 11,061.4 | 10,836.5
Expected future benefits and expenses (Discounted) | 5,954.9 | 5,782.3
Medicare supplement |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums (Undiscounted) | 6,564.7 | 5,808.6
Expected future gross premiums (Discounted) | 4,487.0 | 4,002.7
Expected future benefits and expenses (Undiscounted) | 5,259.4 | 4,652.8
Expected future benefits and expenses (Discounted) | 3,577.4 | 3,177.5
Long-term care |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums (Undiscounted) | 3,359.6 | 3,381.3
Expected future gross premiums (Discounted) | 2,467.6 | 2,342.2
Expected future benefits and expenses (Undiscounted) | 8,002.2 | 7,785.9
Expected future benefits and expenses (Discounted) | 4,300.7 | 4,201.9
Traditional life |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums (Undiscounted) | 5,746.9 | 5,684.5
Expected future gross premiums (Discounted) | 4,149.2 | 4,035.2
Expected future benefits and expenses (Undiscounted) | 7,645.7 | 7,615.0
Expected future benefits and expenses (Discounted) | $ 4,641.9 | $ 4,569.8

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