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FAIR VALUE MEASUREMENT - Fair value hierarchy of financial instruments held (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Assets:    
U.S. Treasury securities $ 43.0 $ 9.1
Deferred compensation plan assets 25.5 28.0
Digital assets - safeguarded assets 22.4  
Digital assets held 0.9  
Total assets 91.8 37.1
Liabilities:    
Contingent consideration liabilities 102.1 70.5
Deferred compensation plan liabilities 25.5 28.0
Digital assets - safeguarded liabilities 22.4  
Debt 1,959.2 1,299.3
Total liabilities 2,109.2 1,397.8
Level 1    
Assets:    
U.S. Treasury securities 43.0 9.1
Deferred compensation plan assets 25.5 28.0
Digital assets - safeguarded assets 22.4  
Digital assets held 0.9  
Total assets 91.8 37.1
Liabilities:    
Deferred compensation plan liabilities 25.5 28.0
Digital assets - safeguarded liabilities 22.4  
Total liabilities 47.9 28.0
Level 2    
Liabilities:    
Debt 1,959.2 1,299.3
Total liabilities 1,959.2 1,299.3
Level 3    
Liabilities:    
Contingent consideration liabilities 102.1 70.5
Total liabilities $ 102.1 $ 70.5