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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, 2024 | Sep. 30, 2023
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | $ 1,807.8 | $ 1,767.1
Interest accretion | 361.2 | 359.5
Other annuities |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | 4.9 | 5.7
Interest accretion | 10.3 | 11.1
Supplemental health |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | 542.3 | 530.3
Interest accretion | 125.7 | 125.9
Medicare supplement |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | 461.6 | 453.4
Interest accretion | 7.8 | 8.0
Long-term care |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | 255.0 | 243.1
Interest accretion | 131.4 | 130.2
Traditional life |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | 544.0 | 534.6
Interest accretion | $ 86.0 | $ 84.3

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