XML 198 R137.htm IDEA: XBRL DOCUMENT
v3.19.1

Financial and capital management - Capital Management (Details) |  |  | 12 Months Ended
--- | --- | --- | ---
Feb. 06, 2019 $ / shares $ / shares | Feb. 07, 2018 $ / shares | Dec. 31, 2018 $ / shares | Dec. 31, 2017 $ / shares
Disclosure of objectives, policies and processes for managing capital [line items] |  |  |  |
Exceeded limit in internal net debt leverage ratio |  |  | 0.47 |
Summary Of Key Ratios [Abstract] |  |  |  |
Net debt leverage ratio |  |  | 2.72 | 2.67
Adjusted EBITDA to net interest expense ratio |  |  | 9.00 | 9.23
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% |
Approved increase in annual dividend |  | 5.20% |  |
Dividends paid, ordinary shares per share | (per share) |  | $ 3.02 | $ 3.02 | $ 2.87
Dividends declared |  |  |  |
Summary Of Key Ratios [Abstract] |  |  |  |
Approved increase in annual dividend | 5.00% |  |  |
Dividends paid, ordinary shares per share | $ 3.17 |  |  |
Dividends declared per common share (in CAD per share) | $ 0.7925 |  |  |
Bottom of range |  |  |  |
Disclosure of objectives, policies and processes for managing capital [line items] |  |  |  |
Target debt leverage ratio |  |  | 1.75 | 1.75
Target adjusted EBITDA to net interest expense ratio |  |  | 7.5 | 7.5
Top of range |  |  |  |
Disclosure of objectives, policies and processes for managing capital [line items] |  |  |  |
Target debt leverage ratio |  |  | 2.25 | 2.25

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