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Borrowings - Interest Expense on Broker-Dealer Facilities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Line of Credit Facility [Line Items] |  |  |
Interest expense | $ 132,859 | $ 97,802 | $ 99,294
Broker-dealer credit facilities |  |  |
Line of Credit Facility [Line Items] |  |  |
Interest expense | 8,427 | 7,909 | 6,238
Uncommitted facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Interest expense | 4,399 | 3,823 | 5,431
Committed facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Interest expense | 3,357 | 3,614 | 533
Overdraft facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Interest expense | $ 671 | $ 472 | $ 274

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