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FAIR VALUE MEASUREMENTS - Summary of Changes in Fair Value of Contingent Consideration Obligation (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation    
Beginning balance $ 172.5 $ 178.6
Changes in fair value 17.4 14.7
Ending balance $ 189.9 $ 193.3