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Financial and capital management - Capital Management (Details)
 12 Months Ended
Feb. 01, 2023
$ / shares
Feb. 03, 2021
$ / shares
Dec. 31, 2022
Feb. 02, 2022
$ / shares
Dec. 31, 2021
Disclosure of objectives, policies and processes for managing capital [line items]          
Net debt leverage ratio     3.30   3.17
Exceeded limit in internal net debt leverage ratio     0.80    
Summary Of Key Ratios [Abstract]          
Net debt leverage ratio     3.30   3.17
Adjusted EBITDA to adjusted net interest expense ratio     8.50   8.77
Approved increase in annual dividend   5.10%      
Dividends paid, ordinary shares per share (in cad per share)   $ 3.50   $ 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%    
Dividend Approval          
Summary Of Key Ratios [Abstract]          
Approved increase in annual dividend 5.20%        
Dividends paid, ordinary shares per share (in cad per share) $ 3.87        
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    
Summary Of Key Ratios [Abstract]          
Net debt leverage ratio     2.0   2.0
Top of range          
Disclosure of objectives, policies and processes for managing capital [line items]          
Net debt leverage ratio     2.5   2.5
Summary Of Key Ratios [Abstract]          
Net debt leverage ratio     2.5   2.5