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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, 2025 | Mar. 31, 2024
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | $ 615.0 | $ 596.9
Interest accretion | 120.8 | 120.5
Other annuities |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | 2.0 | 1.0
Interest accretion | 3.2 | 3.6
Supplemental health |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | 184.8 | 175.2
Interest accretion | 42.3 | 41.9
Medicare supplement |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | 158.1 | 156.8
Interest accretion | 2.5 | 2.7
Long-term care |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | 86.7 | 85.0
Interest accretion | 43.8 | 43.8
Traditional life |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | 183.4 | 178.9
Interest accretion | $ 29.0 | $ 28.5

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