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Related Party Transactions - Receivables from and Payables to Related Broker-Dealers (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Related Party Transaction [Line Items] |  |  |
Payables to related parties |  |  | $ 8.3
Related Party | Transactions with Freedom |  |  |
Related Party Transaction [Line Items] |  |  |
Receivables from related parties | $ 1.4 | $ 1.4 |
Related Party | Open Derivative Contracts with Cantor |  |  |
Related Party Transaction [Line Items] |  |  |
Receivables from related parties | 2.7 | 3.1 |
Payables to related parties | 4.9 | 5.8 |
Related Party | Fails and Pending Trades with Cantor |  |  |
Related Party Transaction [Line Items] |  |  |
Payables to related parties | $ 0.8 | $ 0.0 |

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