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FAIR VALUE MEASUREMENTS - Narrative (Details)
$ in Millions
Sep. 30, 2019
USD ($)
Level 2  
Financial instruments  
Notes payable fair value disclosure $ 676.9
Discount Rate | Level 3 | Obligations | Minimum  
Financial instruments  
Contingent consideration liability measurement input 0.019
Discount Rate | Level 3 | Obligations | Maximum  
Financial instruments  
Contingent consideration liability measurement input 0.030
Probability of Milestone Achievement | Level 3 | Obligations | Minimum  
Financial instruments  
Contingent consideration liability measurement input 0.434
Probability of Milestone Achievement | Level 3 | Obligations | Maximum  
Financial instruments  
Contingent consideration liability measurement input 0.984
Volatility of Future Revenue | Level 3 | Obligations  
Financial instruments  
Contingent consideration liability measurement input 0.450