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Financial and capital management - Capital Management (Details)
 12 Months Ended
Feb. 06, 2025
$ / shares
Feb. 07, 2024
$ / shares
Dec. 31, 2024
Dec. 31, 2023
Feb. 06, 2024
$ / shares
Disclosure of objectives, policies and processes for managing capital [line items]          
Net debt leverage ratio     3.81 3.48  
Target adjusted EBITDA to net debt leverage ratio     3.0    
Exceeded limit in internal net debt leverage ratio     0.81 0.98  
Dividends paid, ordinary shares per share (in cad per share)         $ 3.87
Percentage of preferred shares included in debt leverage calculation     50.00%    
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      
Major ordinary share transactions | Quarterly          
Disclosure of objectives, policies and processes for managing capital [line items]          
Dividends proposed or declared before financial statements authorised for issue but not recognised as distribution to owners per share $ 0.9975        
Bottom of range          
Disclosure of objectives, policies and processes for managing capital [line items]          
Target adjusted EBITDA to net debt leverage ratio       2.0  
Top of range          
Disclosure of objectives, policies and processes for managing capital [line items]          
Target adjusted EBITDA to net debt leverage ratio       2.5