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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fixed Indexed Annuity Insurance Liability (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Jan. 01, 2021
Policyholder Account Balance [Line Items]        
Policyholder account balances $ 15,481.8 $ 15,234.2 $ 15,079.7 $ 12,367.7
Total fixed indexed annuity insurance liabilities 9,497.9 9,153.4    
Fixed Indexed Annuity        
Policyholder Account Balance [Line Items]        
Policyholder account balances 9,960.6 9,644.8    
Future policy benefits $ (462.7) $ (491.4)