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