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Related Party Transactions - Receivables from and Payables to Related Broker-Dealers (Details) - Related Party - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Transactions with Freedom |  |
Related Party Transaction [Line Items] |  |
Receivables from related parties | $ 1.4 | $ 1.3
Open Derivative Contracts with Cantor |  |
Related Party Transaction [Line Items] |  |
Receivables from related parties | 0.5 | 4.8
Payables to related parties | 1.0 | 4.0
Fails and Pending Trades with Cantor |  |
Related Party Transaction [Line Items] |  |
Receivables from related parties | $ 9.8 | $ 0.1

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