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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
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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Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.

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