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INVESTMENT BORROWINGS - NARRATIVE (Details)
$ in Millions
9 Months Ended
Sep. 30, 2023
USD ($)
subsidiary
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Debt Instrument [Line Items]      
Number of insurance subsidiaries that are members of the FHLB | subsidiary 3    
Investment borrowings $ 2,089.4   $ 1,639.5
Interest expense on FHLB borrowings 74.2 $ 17.4  
Federal Home Loan Bank Advances      
Debt Instrument [Line Items]      
Federal home loan bank stock 90.1    
Investment borrowings 2,089.4    
Federal home loan bank advances, collateral pledged $ 2,500.0