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Share-Based Compensation Expenses (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Share-based compensation expenses $ 2.4   $ 5.6 $ 4.3
Stock options and restricted share units        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Share-based compensation expenses 1.7 $ 1.4 3.2 3.0
Deferred share units        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Share-based compensation expenses $ 0.7 $ (1.4) $ 2.4 $ 1.3