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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
Jun. 30, 2024
Jun. 30, 2023
Liability for Future Policy Benefit, Activity [Line Items]    
Gross premiums $ 1,204.7 $ 1,186.9
Interest accretion 240.8 239.4
Other annuities    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross premiums 2.6 3.8
Interest accretion 7.0 7.4
Supplemental health    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross premiums 361.1 355.0
Interest accretion 83.8 83.8
Medicare supplement    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross premiums 309.0 307.2
Interest accretion 5.2 5.4
Long-term care    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross premiums 170.0 163.6
Interest accretion 87.6 86.7
Traditional life    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross premiums 362.0 357.3
Interest accretion $ 57.2 $ 56.1