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FAIR VALUE MEASUREMENT - Fair value hierarchy for assets and liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Assets:    
Digital assets - safeguarded assets $ 22.4  
Total assets 91.8 $ 37.1
Liabilities:    
Contingent consideration liabilities 102.1 70.5
Digital assets - safeguarded liabilities 22.4  
Total liabilities 2,109.2 1,397.8
Level 1    
Assets:    
Digital assets - safeguarded assets 22.4  
Total assets 91.8 37.1
Liabilities:    
Digital assets - safeguarded liabilities 22.4  
Total liabilities 47.9 28.0
Level 2    
Liabilities:    
Total liabilities 1,959.2 1,299.3
Level 3    
Liabilities:    
Contingent consideration liabilities 102.1 70.5
Total liabilities 102.1 70.5
Recurring    
Assets:    
Digital assets - safeguarded assets 22.4  
Total assets 90.9 37.1
Liabilities:    
Contingent consideration liabilities 102.1 70.5
Digital assets - safeguarded liabilities 22.4  
Total liabilities 124.5 70.5
Recurring | U.S. Treasury securities    
Assets:    
Total assets 43.0 9.1
Recurring | Marketable securities | Mutual funds    
Assets:    
Total assets 16.1 18.4
Recurring | Marketable securities | Money market funds    
Assets:    
Total assets 9.4 9.6
Recurring | Level 1    
Assets:    
Digital assets - safeguarded assets 22.4  
Total assets 90.9 37.1
Liabilities:    
Digital assets - safeguarded liabilities 22.4  
Total liabilities 22.4  
Recurring | Level 1 | U.S. Treasury securities    
Assets:    
Total assets 43.0 9.1
Recurring | Level 1 | Marketable securities | Mutual funds    
Assets:    
Total assets 16.1 18.4
Recurring | Level 1 | Marketable securities | Money market funds    
Assets:    
Total assets 9.4 9.6
Recurring | Level 3    
Liabilities:    
Contingent consideration liabilities 102.1 70.5
Total liabilities $ 102.1 $ 70.5