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Share-based compensation expense (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Share-based compensation expense   $ 5.0 $ 4.3 $ 7.0
Stock options and restricted share units        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Share-based compensation expense $ 1.4 1.6 3.0 3.0
Deferred Share Units        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Share-based compensation expense $ (1.4) $ 3.4 $ 1.3 $ 4.0