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FAIR VALUE MEASUREMENT - Schedule of fair value hierarchy for assets and liabilities measured at fair value on a recurring basis (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Aug. 04, 2020
Assets:      
Total assets $ 118.7 $ 92.4  
Liabilities:      
Contingent consideration liabilities 26.6 32.7  
Total liabilities 1,350.7 1,376.3  
Hanweck, FT Options, Trade Alert, and MATCHNow      
Liabilities:      
Contingent consideration liabilities     $ 32.7
Level 1      
Assets:      
Total assets 118.7 92.4  
Liabilities:      
Total liabilities 25.6 24.5  
Level 2      
Liabilities:      
Total liabilities 1,298.5 1,319.1  
Level 3      
Liabilities:      
Contingent consideration liabilities 26.6 32.7  
Total liabilities 26.6 32.7  
Recurring      
Assets:      
Total assets 118.7 92.4  
Liabilities:      
Contingent consideration liabilities 26.6 32.7  
Total liabilities 26.6 32.7  
Recurring | U.S. Treasury securities      
Assets:      
Total assets 93.1 67.9  
Recurring | Marketable securities | Mutual funds      
Assets:      
Total assets 16.2 15.9  
Recurring | Marketable securities | Money market funds      
Assets:      
Total assets 9.4 8.6  
Recurring | Level 1      
Assets:      
Total assets 118.7 92.4  
Recurring | Level 1 | U.S. Treasury securities      
Assets:      
Total assets 93.1 67.9  
Recurring | Level 1 | Marketable securities | Mutual funds      
Assets:      
Total assets 16.2 15.9  
Recurring | Level 1 | Marketable securities | Money market funds      
Assets:      
Total assets 9.4 8.6  
Recurring | Level 3      
Liabilities:      
Contingent consideration liabilities 26.6 32.7  
Total liabilities $ 26.6 $ 32.7