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Related Party Transactions - Clearing Capital Agreement with Cantor (Details) - Related Party - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Related Party Transaction [Line Items]        
Cash and collateral posted expense $ 1.4 $ 0.7 $ 3.3 $ 1.5
Collateral already posted, aggregate fair value $ 148.6   $ 148.6