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FAIR VALUE MEASUREMENT - Fair value hierarchy for assets and liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Assets:    
Total assets $ 48.7 $ 37.1
Liabilities:    
Contingent consideration liabilities 53.3 70.5
Total liabilities 1,674.3 1,397.8
Level 1    
Assets:    
Total assets 48.7 37.1
Liabilities:    
Total liabilities 27.4 28.0
Level 2    
Liabilities:    
Total liabilities 1,593.6 1,299.3
Level 3    
Liabilities:    
Contingent consideration liabilities 53.3 70.5
Total liabilities 53.3 70.5
Recurring    
Assets:    
Total assets 48.7 37.1
Liabilities:    
Contingent consideration liabilities 53.3 70.5
Total liabilities 53.3 70.5
Recurring | U.S. Treasury securities    
Assets:    
Total assets 21.3 9.1
Recurring | Marketable securities | Mutual funds    
Assets:    
Total assets 17.4 18.4
Recurring | Marketable securities | Money market funds    
Assets:    
Total assets 10.0 9.6
Recurring | Level 1    
Assets:    
Total assets 48.7 37.1
Recurring | Level 1 | U.S. Treasury securities    
Assets:    
Total assets 21.3 9.1
Recurring | Level 1 | Marketable securities | Mutual funds    
Assets:    
Total assets 17.4 18.4
Recurring | Level 1 | Marketable securities | Money market funds    
Assets:    
Total assets 10.0 9.6
Recurring | Level 3    
Liabilities:    
Contingent consideration liabilities 53.3 70.5
Total liabilities $ 53.3 $ 70.5