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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 |

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