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INVESTMENT BORROWINGS - NARRATIVE (Details)
$ in Millions
6 Months Ended
Jun. 30, 2021
USD ($)
subsidiary
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]      
Number of insurance subsidiaries that are members of the FHLB | subsidiary 3    
Investment borrowings $ 1,641.5   $ 1,642.5
Federal Home Loan Bank Advances      
Debt Instrument [Line Items]      
Federal home loan bank stock 71.0    
Investment borrowings 1,641.5    
Federal home loan bank, advances, collateral pledged 2,100.0    
Aggregate fee to prepay all fixed rate FHLB borrowings 3.8    
Interest expense on FHLB borrowings $ 5.2 $ 14.9