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Related Party Transactions - Receivables from and Payables to Related Broker-Dealers (Details) - Related Party - USD ($) | Mar. 31, 2024 | Dec. 31, 2023
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Transactions with Freedom |  |
Related Party Transaction [Line Items] |  |
Receivables from related parties | $ 1,400,000 | $ 1,400,000
Open Derivative Contracts with Cantor |  |
Related Party Transaction [Line Items] |  |
Receivables from related parties | 4,100,000 | 2,700,000
Payables to related parties | 2,200,000 | 4,900,000
Fails and Pending Trades with Cantor |  |
Related Party Transaction [Line Items] |  |
Payables to related parties | $ 900,000 | $ 800,000

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