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Shareholders' equity - Share capital - Normal Course Issuer Bid and Automatic Share Purchase Plan (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Nov. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Nov. 30, 2022
Shareholders' equity              
Number of shares may acquire       10,078,488      
Number of shares authorized to be repurchased 10,078,488           2,000,000
Repurchase of common shares under NCIB (in shares)   0 720,440 283,100 911,646    
Repurchase of common shares under NCIB   $ 0.0 $ 10.5 $ 3.6 $ 13.1    
Number of shares authorized to be repurchased per day 26,350            
Percentage of average daily trading volume of the common shares that can be repurchased 25.00%            
Repurchase under ASPP           $ 8.0  
Remaining number of shares authorized to be repurchased   9,623,788   9,623,788