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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, 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