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FAIR VALUE MEASUREMENTS - Summary of Changes in Fair Value of Contingent Consideration Obligation (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation    
Beginning balance $ 186.1 $ 172.5
Changes in fair value (4.5) (2.2)
Ending balance $ 181.6 $ 170.3