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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
Sep. 30, 2021
Dec. 31, 2020
Aug. 04, 2020
Assets:      
Total assets $ 26.7 $ 92.4  
Liabilities:      
Contingent consideration liabilities 75.2 32.7  
Total liabilities 1,400.3 1,376.3  
Hanweck, FT Options, Trade Alert, and MATCHNow      
Liabilities:      
Contingent consideration liabilities     $ 32.7
Level 1      
Assets:      
Total assets 26.7 92.4  
Liabilities:      
Total liabilities 26.2 24.5  
Level 2      
Liabilities:      
Total liabilities 1,298.9 1,319.1  
Level 3      
Liabilities:      
Contingent consideration liabilities 75.2 32.7  
Total liabilities 75.2 32.7  
Recurring      
Assets:      
Total assets 26.7 92.4  
Liabilities:      
Contingent consideration liabilities 75.2 32.7  
Total liabilities 75.2 32.7  
Recurring | U.S. Treasury securities      
Assets:      
Total assets 0.5 67.9  
Recurring | Marketable securities | Mutual funds      
Assets:      
Total assets 16.7 15.9  
Recurring | Marketable securities | Money market funds      
Assets:      
Total assets 9.5 8.6  
Recurring | Level 1      
Assets:      
Total assets 26.7 92.4  
Recurring | Level 1 | U.S. Treasury securities      
Assets:      
Total assets 0.5 67.9  
Recurring | Level 1 | Marketable securities | Mutual funds      
Assets:      
Total assets 16.7 15.9  
Recurring | Level 1 | Marketable securities | Money market funds      
Assets:      
Total assets 9.5 8.6  
Recurring | Level 3      
Liabilities:      
Contingent consideration liabilities 75.2 32.7  
Total liabilities $ 75.2 $ 32.7