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Related Party Transactions - Receivables from and Payables to Related Broker-Dealers (Details) - Related Party - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Transactions with Freedom |  |
Related Party Transaction [Line Items] |  |
Receivables from related parties | $ 1.3 | $ 1.4
Open Derivative Contracts with Cantor |  |
Related Party Transaction [Line Items] |  |
Receivables from related parties | 4.8 | 2.7
Payables to related parties | 4.0 | 4.9
Fails and Pending Trades with Cantor |  |
Related Party Transaction [Line Items] |  |
Payables to related parties | $ 0.1 | $ 0.8

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