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FAIR VALUE MEASUREMENT - Schedule of fair value hierarchy for assets measured at fair value on a recurring basis (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Assets:    
Total assets $ 95.5 $ 92.4
Liabilities:    
Contingent consideration liabilities 32.1 32.7
Total liabilities 1,243.9 1,376.3
Level 1    
Assets:    
Total assets 95.5 92.4
Liabilities:    
Total liabilities 24.0 24.5
Level 2    
Liabilities:    
Total liabilities 1,187.8 1,319.1
Level 3    
Liabilities:    
Contingent consideration liabilities 32.1 32.7
Total liabilities 32.1 32.7
Recurring    
Assets:    
Total assets 95.5 92.4
Liabilities:    
Contingent consideration liabilities 32.1 32.7
Total liabilities 32.1 32.7
Recurring | U.S. Treasury securities    
Assets:    
Total assets 71.5 67.9
Recurring | Marketable securities | Mutual funds    
Assets:    
Total assets 14.6 15.9
Recurring | Marketable securities | Money market funds    
Assets:    
Total assets 9.4 8.6
Recurring | Level 1    
Assets:    
Total assets 95.5 92.4
Recurring | Level 1 | U.S. Treasury securities    
Assets:    
Total assets 71.5 67.9
Recurring | Level 1 | Marketable securities | Mutual funds    
Assets:    
Total assets 14.6 15.9
Recurring | Level 1 | Marketable securities | Money market funds    
Assets:    
Total assets 9.4 8.6
Recurring | Level 3    
Liabilities:    
Contingent consideration liabilities 32.1 32.7
Total liabilities $ 32.1 $ 32.7