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Related Party Transactions - Clearing Capital Agreement with Cantor (Details) - Related Party - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Related Party Transaction [Line Items] |  |  |
Cash and collateral posted expense | $ 4.4 | $ 2.2 | $ 0.8
Collateral already posted, aggregate fair value | $ 124.6 |  |

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