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FAIR VALUE MEASUREMENT - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Segment Reporting Information        
Contingent consideration liabilities $ 26.6 $ 26.6   $ 32.7
Payment of contingent consideration liabilities   6.5 $ 2.2  
Recurring        
Segment Reporting Information        
Contingent consideration liabilities 26.6 $ 26.6   $ 32.7
Payment of contingent consideration liabilities $ 5.7