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SHARE-BASED PAYMENTS - Share-based compensation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Share-based payment transaction    
Share-based compensation expense $ 17.2 $ 23.7
Share option    
Share-based payment transaction    
Share-based compensation expense 0.1 0.3
Restricted share plan    
Share-based payment transaction    
Share-based compensation expense 13.2 19.2
DSUs    
Share-based payment transaction    
Share-based compensation expense 1.4 1.4
ESPP    
Share-based payment transaction    
Share-based compensation expense $ 2.5 $ 2.8