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SHARE-BASED PAYMENTS - Employee share purchase plans (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Share-based payment transaction    
Share-based compensation expense $ 23.7 $ 34.4
ESPP    
Share-based payment transaction    
Maximum contribution of annual base salary of employees (as a percent) 10.00%  
Employer contributions (as a percent) 50.00%  
Share-based compensation expense $ 2.8 $ 2.4