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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, 2023
Sep. 30, 2022
Liability for Future Policy Benefit, Activity [Line Items]    
Gross premiums $ 1,767.1 $ 1,778.8
Interest accretion 359.5 355.7
Other annuities    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross premiums 5.7 6.8
Interest accretion 11.1 11.4
Supplemental health    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross premiums 530.3 519.8
Interest accretion 125.9 123.9
Medicare supplement    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross premiums 453.4 487.7
Interest accretion 8.0 8.4
Long-term care    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross premiums 243.1 245.6
Interest accretion 130.2 129.2
Traditional life    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross premiums 534.6 518.9
Interest accretion $ 84.3 $ 82.8