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LIABILITIES FOR INSURANCE PRODUCTS - SUMMARY OF AMOUNT OF REVENUE AND INTEREST, TRADITIONAL AND LIMITED PAYMENT CONTRACTS (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | $ 1,767.1 | $ 1,778.8
Interest accretion | 359.5 | 355.7
Other annuities |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | 5.7 | 6.8
Interest accretion | 11.1 | 11.4
Supplemental health |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | 530.3 | 519.8
Interest accretion | 125.9 | 123.9
Medicare supplement |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | 453.4 | 487.7
Interest accretion | 8.0 | 8.4
Long-term care |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | 243.1 | 245.6
Interest accretion | 130.2 | 129.2
Traditional life |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | 534.6 | 518.9
Interest accretion | $ 84.3 | $ 82.8

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