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LIABILITIES FOR INSURANCE PRODUCTS - SUMMARY OF AMOUNT OF REVENUE AND INTEREST, TRADITIONAL AND LIMITED PAYMENT CONTRACTS (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross premiums | $ 2,417.7 | $ 2,355.8 | $ 2,361.4
Interest accretion | 482.3 | 479.7 | 474.9
Other annuity |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross premiums | 5.9 | 8.1 | 8.7
Interest accretion | 13.6 | 14.8 | 15.2
Supplemental health |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross premiums | 724.8 | 705.4 | 691.7
Interest accretion | 167.9 | 167.6 | 165.5
Medicare supplement |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross premiums | 618.8 | 608.1 | 644.9
Interest accretion | 10.4 | 10.6 | 11.2
Long-term care |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross premiums | 344.1 | 325.5 | 323.6
Interest accretion | 175.3 | 174.0 | 172.4
Traditional life |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |
Gross premiums | 724.2 | 708.7 | 692.5
Interest accretion | $ 115.1 | $ 112.7 | $ 110.6

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