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Borrowings - Interest Expense on Broker-Dealer Facilities (Details) - USD ($) $ in Thousands | 3 Months Ended
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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

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