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LIABILITIES FOR INSURANCE PRODUCTS - Fixed Indexed Annuity Insurance Liability (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Policyholder Account Balance [Line Items]      
Policyholder account balances $ 17,240.5 $ 15,667.8 $ 15,481.8
Total fixed indexed annuity insurance liabilities 10,491.6 9,863.7  
Fixed Indexed Annuity      
Policyholder Account Balance [Line Items]      
Policyholder account balances 10,594.8 10,138.6  
Future policy benefits $ (103.2) $ (274.9)