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Acquisitions (Detail)
$ in Millions
12 Months Ended
Jul. 30, 2021
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
acquisition
Business Acquisition [Line Items]      
Total consideration transferred   $ 71.0  
Goodwill recorded   $ 18.4  
Business acquired | acquisition     0
Futures Exchange Group      
Business Acquisition [Line Items]      
Payments to acquire businesses $ 4.9