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Related Party Transactions - Purchases of Futures Exchange Group (Details) - Futures Exchange Group - USD ($) $ in Millions | Jul. 30, 2021 | Sep. 30, 2025 | Dec. 31, 2024
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Related Party Transaction [Line Items] |  |  |
Cash | $ 4.9 |  |
Related Party |  |  |
Related Party Transaction [Line Items] |  |  |
Business combination, indemnified expenses (up to) | $ 1.0 |  |
Indemnification assets |  | $ 1.0 | $ 1.0

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