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SHARE-BASED PAYMENTS - Share-based compensation (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
Share option    
Share-based payment transaction    
Share-based compensation expense 0.3 1.0
Restricted share plan    
Share-based payment transaction    
Share-based compensation expense 19.2 29.7
DSUs    
Share-based payment transaction    
Share-based compensation expense 1.4 1.3
ESPP    
Share-based payment transaction    
Share-based compensation expense $ 2.8 $ 2.4