Related Party Transactions - Clearing Capital Agreement with Cantor (Details) - Related Party - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Related Party Transaction [Line Items]
Cash and collateral posted expense	$ 1.0	$ 1.3	$ 2.0	$ 2.2
Collateral already posted, aggregate fair value	$ 37.8		$ 37.8		$ 67.6

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details