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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Liabilities for Insurance Products Related to Fixed Indexed Annuity (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Policyholder Account Balance [Line Items]    
Total fixed indexed annuity insurance liabilities $ 9,497.9 $ 9,153.4
Fixed Indexed Annuity    
Policyholder Account Balance [Line Items]    
Host contract liability 8,284.5 7,856.4
Embedded derivatives at fair value $ 1,213.4 $ 1,297.0