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INVESTMENT BORROWINGS - NARRATIVE (Details) $ in Millions	9 Months Ended
	Sep. 30, 2024 USD ($) subsidiary	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
Number of insurance subsidiaries that are members of the FHLB | subsidiary	3
Investment borrowings	$ 2,188.9		$ 2,189.3
Interest expense on FHLB borrowings	94.6	$ 74.2
Federal Home Loan Bank Advances
Debt Instrument [Line Items]
Federal home loan bank stock	94.6
Investment borrowings	2,188.9
Federal home loan bank advances, collateral pledged	$ 2,800.0

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