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SHARE-BASED PAYMENTS - Share-based compensation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Share-based payment transaction    
Share-based compensation expense $ 30.2 $ 24.5
Share options    
Share-based payment transaction    
Share-based compensation expense 2.4 2.7
Restricted share unit plan    
Share-based payment transaction    
Share-based compensation expense 24.6 18.6
Deferred share unit plan    
Share-based payment transaction    
Share-based compensation expense 1.1 1.1
Employee share purchase plan    
Share-based payment transaction    
Share-based compensation expense $ 2.1 $ 2.1