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FAIR VALUE MEASUREMENTS - Summary of Changes in Fair Value of Contingent Consideration Obligation (Details)
$ in Millions
9 Months Ended
Sep. 30, 2019
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation  
Beginning balance $ 178.6
Changes in fair value 12.4
Ending balance $ 191.0