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LIABILITIES FOR INSURANCE PRODUCTS - SUMMARY OF AMOUNT OF REVENUE AND INTEREST, TRADITIONAL AND LIMITED PAYMENT CONTRACTS (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | $ 1,225.6 | $ 1,204.7
Interest accretion | 241.7 | 240.8
Other annuities |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | 3.3 | 2.6
Interest accretion | 6.5 | 7.0
Supplemental health |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | 369.2 | 361.1
Interest accretion | 84.6 | 83.8
Medicare supplement |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | 310.8 | 309.0
Interest accretion | 5.1 | 5.2
Long-term care |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | 175.2 | 170.0
Interest accretion | 87.6 | 87.6
Traditional life |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Gross premiums | 367.1 | 362.0
Interest accretion | $ 57.9 | $ 57.2

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