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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, 2025 | Sep. 30, 2024
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | $ 1,841.8 | $ 1,807.8
Interest accretion | 362.4 | 361.2
Other annuities |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | 6.0 | 4.9
Interest accretion | 9.6 | 10.3
Supplemental health |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | 554.0 | 542.3
Interest accretion | 126.9 | 125.7
Medicare supplement |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | 465.4 | 461.6
Interest accretion | 7.6 | 7.8
Long-term care |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | 264.8 | 255.0
Interest accretion | 131.3 | 131.4
Traditional life |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | 551.6 | 544.0
Interest accretion | $ 87.0 | $ 86.0

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