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 |