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Financial and capital management - Capital Management (Details)
 12 Months Ended
Feb. 03, 2021
$ / shares
Feb. 05, 2020
$ / shares
Dec. 31, 2020
Mar. 15, 2021
$ / shares
Dec. 31, 2019
Feb. 06, 2019
$ / shares
Disclosure of objectives, policies and processes for managing capital [line items]            
Net debt leverage ratio     2.93   2.81  
Exceeded limit in internal net debt leverage ratio     0.43      
Summary Of Key Ratios [Abstract]            
Net debt leverage ratio     2.93   2.81  
Adjusted EBITDA to net interest expense ratio     8.32   8.50  
Approved increase in annual dividend 5.10% 5.00%        
Dividends paid, ordinary shares per share $ 3.50 $ 3.33   $ 0.875   $ 3.17
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%      
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     2.50   2.50  
Summary Of Key Ratios [Abstract]            
Net debt leverage ratio     2.50   2.50