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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, 2026
Mar. 31, 2025
Liability for Future Policy Benefit, Activity [Line Items]    
Gross premiums $ 640.0 $ 615.0
Interest accretion 121.9 120.8
Other annuities    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross premiums 2.4 2.0
Interest accretion 3.2 3.2
Supplemental health    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross premiums 189.9 184.8
Interest accretion 42.9 42.3
Medicare supplement    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross premiums 171.7 158.1
Interest accretion 2.4 2.5
Long-term care    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross premiums 90.3 86.7
Interest accretion 43.8 43.8
Traditional life    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross premiums 185.7 183.4
Interest accretion $ 29.6 $ 29.0