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SHARES-BASED AWARDS - Additional information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Aggregate intrinsic value of options exercised $ 8.3 $ 0.4
Total fair value of share options granted 14.8 13.9
Total fair value of share options vested 3.9 6.9
Unamortized share-based compensation $ 14.9 $ 6.6
weighted average remaining amortization period 3 years 2 years 8 months 12 days