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SHARE-BASED PAYMENTS - Employee share purchase plans (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Share-based payment transaction    
Total share-based compensation $ 30.2 $ 24.5
Employee share purchase plan    
Share-based payment transaction    
Maximum contribution of annual base salary of employees (as a percent) 10.00%  
Employer contributions (as a percent) 50.00%  
Total share-based compensation $ 2.1 $ 2.1