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Share-Based Compensation Expenses (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Share-Based Compensation Expenses        
Share-based compensation expenses $ 1.8 $ 2.4 $ 4.6 $ 5.6
Stock options and restricted share units        
Share-Based Compensation Expenses        
Share-based compensation expenses 1.5 1.7 2.9 3.2
Deferred share units        
Share-Based Compensation Expenses        
Share-based compensation expenses $ 0.3 $ 0.7 $ 1.7 $ 2.4