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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 | Dec. 31, 2024 | Dec. 31, 2023
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Other annuity |  |
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) | 328.4 | 376.7
Expected future benefits and expenses (Discounted) | 264.5 | 308.9
Supplemental health |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums (Undiscounted) | 8,994.0 | 8,909.8
Expected future gross premiums (Discounted) | 5,479.1 | 5,625.9
Expected future benefits and expenses (Undiscounted) | 10,942.1 | 10,783.5
Expected future benefits and expenses (Discounted) | 5,828.2 | 6,023.3
Medicare supplement |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums (Undiscounted) | 6,248.7 | 5,698.1
Expected future gross premiums (Discounted) | 4,248.6 | 4,090.4
Expected future benefits and expenses (Undiscounted) | 4,993.9 | 4,544.1
Expected future benefits and expenses (Discounted) | 3,375.6 | 3,236.6
Long-term care |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums (Undiscounted) | 3,508.4 | 3,280.4
Expected future gross premiums (Discounted) | 2,419.8 | 2,353.4
Expected future benefits and expenses (Undiscounted) | 7,930.4 | 7,680.6
Expected future benefits and expenses (Discounted) | 4,240.1 | 4,364.6
Traditional life |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Expected future gross premiums (Undiscounted) | 5,639.0 | 5,580.4
Expected future gross premiums (Discounted) | 4,006.3 | 4,069.6
Expected future benefits and expenses (Undiscounted) | 7,632.9 | 7,538.5
Expected future benefits and expenses (Discounted) | $ 4,570.6 | $ 4,694.7

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