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LIABILITIES FOR INSURANCE PRODUCTS - SUMMARY OF AMOUNT OF REVENUE AND INTEREST, TRADITIONAL AND LIMITED PAYMENT CONTRACTS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Liability for Future Policy Benefit, Activity [Line Items]      
Gross premiums $ 2,417.7 $ 2,355.8 $ 2,361.4
Interest accretion 482.3 479.7 474.9
Other annuity      
Liability for Future Policy Benefit, Activity [Line Items]      
Gross premiums 5.9 8.1 8.7
Interest accretion 13.6 14.8 15.2
Supplemental health      
Liability for Future Policy Benefit, Activity [Line Items]      
Gross premiums 724.8 705.4 691.7
Interest accretion 167.9 167.6 165.5
Medicare supplement      
Liability for Future Policy Benefit, Activity [Line Items]      
Gross premiums 618.8 608.1 644.9
Interest accretion 10.4 10.6 11.2
Long-term care      
Liability for Future Policy Benefit, Activity [Line Items]      
Gross premiums 344.1 325.5 323.6
Interest accretion 175.3 174.0 172.4
Traditional life      
Liability for Future Policy Benefit, Activity [Line Items]      
Gross premiums 724.2 708.7 692.5
Interest accretion $ 115.1 $ 112.7 $ 110.6