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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
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