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Financial and capital management - Capital Management (Details)
 12 Months Ended
Feb. 02, 2022
$ / shares
Feb. 03, 2021
$ / shares
Dec. 31, 2021
Apr. 15, 2022
$ / shares
Dec. 31, 2020
Feb. 05, 2020
$ / shares
Disclosure of objectives, policies and processes for managing capital [line items]            
Net debt leverage ratio     3.18   2.93  
Exceeded limit in internal net debt leverage ratio     0.68      
Summary Of Key Ratios [Abstract]            
Net debt leverage ratio     3.18   2.93  
Adjusted EBITDA to adjusted net interest expense ratio     8.77   8.32  
Approved increase in annual dividend   5.10%        
Dividends paid, ordinary shares per share   $ 3.50       $ 3.33
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%      
Major ordinary share transactions [member]            
Summary Of Key Ratios [Abstract]            
Approved increase in annual dividend 5.10%          
Dividends paid, ordinary shares per share $ 3.68 $ 3.50        
Major ordinary share transactions [member] | Forecast            
Summary Of Key Ratios [Abstract]            
Dividends paid, ordinary shares per share       $ 0.92    
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