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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

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