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LIABILITIES FOR INSURANCE PRODUCTS - SUMMARY OF AMOUNT OF REVENUE AND INTEREST, TRADITIONAL AND LIMITED PAYMENT CONTRACTS (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Liability for Future Policy Benefit, Activity [Line Items]    
Gross premiums $ 615.0 $ 596.9
Interest accretion 120.8 120.5
Other annuities    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross premiums 2.0 1.0
Interest accretion 3.2 3.6
Supplemental health    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross premiums 184.8 175.2
Interest accretion 42.3 41.9
Medicare supplement    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross premiums 158.1 156.8
Interest accretion 2.5 2.7
Long-term care    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross premiums 86.7 85.0
Interest accretion 43.8 43.8
Traditional life    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross premiums 183.4 178.9
Interest accretion $ 29.0 $ 28.5