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FAIR VALUE MEASUREMENT - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information      
Contingent consideration liabilities $ 70.5 $ 32.7  
Payment of contingent consideration liabilities 9.1 2.2 $ 4.3
Hanweck, FT Options, Trade Alert And Chi-X Asia Pacific      
Segment Reporting Information      
Payment of contingent consideration liabilities 9.1    
Recurring      
Segment Reporting Information      
Contingent consideration liabilities $ 70.5 $ 32.7