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FAIR VALUE MEASUREMENT - Fair value hierarchy for assets and liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Aug. 04, 2020
Assets:      
Total assets $ 37.1 $ 92.4  
Liabilities:      
Contingent consideration liabilities 70.5 32.7  
Total liabilities 1,397.8 1,376.3  
Hanweck, FT Options, Trade Alert, and MATCHNow      
Liabilities:      
Contingent consideration liabilities     $ 32.7
Level 1      
Assets:      
Total assets 37.1 92.4  
Liabilities:      
Total liabilities 28.0 24.5  
Level 2      
Liabilities:      
Total liabilities 1,299.3 1,319.1  
Level 3      
Liabilities:      
Contingent consideration liabilities 70.5 32.7  
Total liabilities 70.5 32.7  
Recurring      
Assets:      
Total assets 37.1 92.4  
Liabilities:      
Contingent consideration liabilities 70.5 32.7  
Total liabilities 70.5 32.7  
Recurring | Mutual funds      
Assets:      
Total assets 18.4 15.9  
Recurring | Money market funds      
Assets:      
Total assets 9.6 8.6  
Recurring | U.S. Treasury securities      
Assets:      
Total assets 9.1 67.9  
Recurring | Level 1      
Assets:      
Total assets 37.1 92.4  
Recurring | Level 1 | Mutual funds      
Assets:      
Total assets 18.4 15.9  
Recurring | Level 1 | Money market funds      
Assets:      
Total assets 9.6 8.6  
Recurring | Level 1 | U.S. Treasury securities      
Assets:      
Total assets 9.1 67.9  
Recurring | Level 3      
Liabilities:      
Contingent consideration liabilities 70.5 32.7  
Total liabilities $ 70.5 $ 32.7