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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, 2024
Sep. 30, 2023
Liability for Future Policy Benefit, Activity [Line Items]    
Gross premiums $ 1,807.8 $ 1,767.1
Interest accretion 361.2 359.5
Other annuities    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross premiums 4.9 5.7
Interest accretion 10.3 11.1
Supplemental health    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross premiums 542.3 530.3
Interest accretion 125.7 125.9
Medicare supplement    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross premiums 461.6 453.4
Interest accretion 7.8 8.0
Long-term care    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross premiums 255.0 243.1
Interest accretion 131.4 130.2
Traditional life    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross premiums 544.0 534.6
Interest accretion $ 86.0 $ 84.3