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Borrowings - Interest Expense on Broker-Dealer Facilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Line of Credit Facility [Line Items]
Interest expense	$ 23,232	$ 24,288
Broker-dealer credit facilities
Line of Credit Facility [Line Items]
Interest expense	1,591	1,653
Uncommitted facility
Line of Credit Facility [Line Items]
Interest expense	601	1,561
Committed facility
Line of Credit Facility [Line Items]
Interest expense	877	0
Overdraft facility
Line of Credit Facility [Line Items]
Interest expense	$ 113	$ 92

X

- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

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