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Financial and capital management - Capital Management (Details)
 12 Months Ended
Feb. 07, 2024
$ / shares
Feb. 01, 2023
$ / shares
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2024
Jan. 31, 2023
$ / shares
Disclosure of objectives, policies and processes for managing capital [line items]            
Net debt leverage ratio     3.48 3.30    
Exceeded limit in internal net debt leverage ratio     0.98      
Exceeded limit in target adjusted EBITDA to net interest expense ratio     0.56      
Adjusted EBITDA to adjusted net interest expense ratio     6.94 8.50    
Approved increase in annual dividend   5.20%        
Dividends paid, ordinary shares per share (in cad per share)   $ 3.87       $ 3.68
Percentage of preferred shares included in debt leverage calculation     50.00%      
Percentage of preferred shares included in adjusted EBITDA to net interest ratio     50.00%      
Forecast            
Disclosure of objectives, policies and processes for managing capital [line items]            
Net debt leverage ratio         3.0  
Dividend Approval            
Disclosure of objectives, policies and processes for managing capital [line items]            
Approved increase in annual dividend 3.10%          
Dividends paid, ordinary shares per share (in cad per share) $ 3.99          
Bottom of range            
Disclosure of objectives, policies and processes for managing capital [line items]            
Net debt leverage ratio     2.0 2.0    
Target adjusted EBITDA to net interest expense ratio     7.5 7.5    
Top of range            
Disclosure of objectives, policies and processes for managing capital [line items]            
Net debt leverage ratio     2.5 2.5