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Related Party Transactions - Clearing Capital Agreement with Cantor (Details) - Related Party - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024
Related Party Transaction [Line Items] |  |  |
Cash and collateral posted expense | $ 0.9 | $ 1.0 |
Collateral already posted, aggregate fair value | $ 115.9 |  | $ 124.6

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