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LIABILITIES FOR INSURANCE PRODUCTS - SUMMARY OF AMOUNT OF REVENUE AND INTEREST, TRADITIONAL AND LIMITED PAYMENT CONTRACTS (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | $ 1,204.7 | $ 1,186.9
Interest accretion | 240.8 | 239.4
Other annuities |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | 2.6 | 3.8
Interest accretion | 7.0 | 7.4
Supplemental health |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | 361.1 | 355.0
Interest accretion | 83.8 | 83.8
Medicare supplement |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | 309.0 | 307.2
Interest accretion | 5.2 | 5.4
Long-term care |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | 170.0 | 163.6
Interest accretion | 87.6 | 86.7
Traditional life |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | 362.0 | 357.3
Interest accretion | $ 57.2 | $ 56.1

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