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LIABILITIES FOR INSURANCE PRODUCTS - SUMMARY OF AMOUNT OF REVENUE AND INTEREST, TRADITIONAL AND LIMITED PAYMENT CONTRACTS (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2026 | Mar. 31, 2025
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | $ 640.0 | $ 615.0
Interest accretion | 121.9 | 120.8
Other annuities |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | 2.4 | 2.0
Interest accretion | 3.2 | 3.2
Supplemental health |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | 189.9 | 184.8
Interest accretion | 42.9 | 42.3
Medicare supplement |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | 171.7 | 158.1
Interest accretion | 2.4 | 2.5
Long-term care |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | 90.3 | 86.7
Interest accretion | 43.8 | 43.8
Traditional life |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | 185.7 | 183.4
Interest accretion | $ 29.6 | $ 29.0

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