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INVESTMENT BORROWINGS - NARRATIVE (Details) $ in Millions	6 Months Ended
	Jun. 30, 2025 USD ($) subsidiary	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Debt Instrument [Line Items]
Number of insurance subsidiaries that are members of the FHLB | subsidiary	3
Investment borrowings	$ 2,441.7		$ 2,188.8
Interest expense on FHLB borrowings	53.7	$ 62.8
Federal Home Loan Bank Advances
Debt Instrument [Line Items]
Federal home loan bank stock	106.7
Investment borrowings	2,441.7
Federal home loan bank advances, collateral pledged	$ 3,300.0

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