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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, 2026
Jun. 30, 2025
Liability for Future Policy Benefit, Activity [Line Items]    
Gross premiums $ 1,272.9 $ 1,225.6
Interest accretion 243.9 241.7
Other annuities    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross premiums 4.3 3.3
Interest accretion 6.3 6.5
Supplemental health    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross premiums 379.1 369.2
Interest accretion 85.9 84.6
Medicare supplement    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross premiums 338.0 310.8
Interest accretion 4.9 5.1
Long-term care    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross premiums 182.0 175.2
Interest accretion 87.5 87.6
Traditional life    
Liability for Future Policy Benefit, Activity [Line Items]    
Gross premiums 369.5 367.1
Interest accretion $ 59.3 $ 57.9