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FAIR VALUE MEASUREMENTS - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Financial instruments        
Change in fair value of contingent consideration liabilities $ 102.6 $ (19.6) $ 107.1 $ (17.4)
Previous Acquisitions        
Financial instruments        
Change in fair value of contingent consideration liabilities 105.2      
Level 2        
Financial instruments        
Notes payable fair value disclosure $ 696.0   $ 696.0  
Discount Rate | Level 3 | Minimum        
Financial instruments        
Contingent consideration liability measurement input 0.001   0.001  
Discount Rate | Level 3 | Maximum        
Financial instruments        
Contingent consideration liability measurement input 0.090   0.090  
Discount Rate | Level 3 | Weighted Average        
Financial instruments        
Contingent consideration liability measurement input 0.046   0.046  
Probability of Milestone Achievement | Level 3 | Minimum        
Financial instruments        
Contingent consideration liability measurement input 0   0  
Probability of Milestone Achievement | Level 3 | Maximum        
Financial instruments        
Contingent consideration liability measurement input 0.982   0.982  
Probability of Milestone Achievement | Level 3 | Weighted Average        
Financial instruments        
Contingent consideration liability measurement input 0.646   0.646  
Volatility of Future Revenue | Level 3 | Minimum        
Financial instruments        
Contingent consideration liability measurement input 0.370   0.370  
Volatility of Future Revenue | Level 3 | Maximum        
Financial instruments        
Contingent consideration liability measurement input 0.400   0.400  
Volatility of Future Revenue | Level 3 | Weighted Average        
Financial instruments        
Contingent consideration liability measurement input 0.381   0.381