XML 209 R128.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Financial and capital management - Capital management (Details) |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 07, 2018 $ / shares | Feb. 01, 2017 $ / shares | Dec. 31, 2017 | Feb. 06, 2018 $ / shares | Jan. 31, 2017 $ / shares | Dec. 31, 2016
Disclosure of objectives, policies and processes for managing capital [line items] |  |  |  |  |  |
Exceeded limit in internal net debt leverage ratio |  |  | 0.45 |  |  |
Summary Of Key Ratios [Abstract] |  |  |  |  |  |
Net debt leverage ratio |  |  | 2.70 |  |  | 2.57
Adjusted EBITDA to net interest expense ratio |  |  | 9.12 |  |  | 9.31
Approved Increase In Annual Dividend | 0.052 | 0.051 |  |  |  |
Dividends paid, ordinary shares per share | $ 3.02 | $ 2.87 |  | $ 2.87 | $ 2.73 |
Percentage of preferred shares included in debt leverage calculation |  |  | 50.00% |  |  |
Bottom of range |  |  |  |  |  |
Disclosure of objectives, policies and processes for managing capital [line items] |  |  |  |  |  |
Target debt leverage ratio |  |  | 1.75 |  |  |
Target adjusted EBITDA to net interest expense ratio |  |  | 7.5 |  |  |
Top of range |  |  |  |  |  |
Disclosure of objectives, policies and processes for managing capital [line items] |  |  |  |  |  |
Target debt leverage ratio |  |  | 2.25 |  |  |
Dividends declared |  |  |  |  |  |
Summary Of Key Ratios [Abstract] |  |  |  |  |  |
Dividends declared per common share (in CAD per share) | $ 0.7550 |  |  |  |  |

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