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INVESTMENT BORROWINGS - NARRATIVE (Details) $ in Millions	9 Months Ended
	Sep. 30, 2025 USD ($) subsidiary	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Debt Instrument [Line Items]
Number of insurance subsidiaries that are members of the FHLB | subsidiary	3
Federal home loan bank stock	$ 109.3
Investment borrowings	2,441.7		$ 2,188.8
Interest expense on FHLB borrowings	83.4	$ 94.6
Federal Home Loan Bank Advances
Debt Instrument [Line Items]
Investment borrowings	2,441.7
Federal home loan bank advances, collateral pledged	$ 3,400.0

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