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Capital Disclosure of investment grade credit rating (Details) - CAD / shares | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Investment [Line Items] |  |  |
Comparable funds from operations to adjusted interest coverage, actual | 4.3 | 3.9 |
Adjusted comparable funds from operations to adjusted net debt, actual | 20.40% | 16.30% |
Adjusted net debt to comparable earnings before interest, taxes, depreciation, and amortization, actual | 3.6 | 3.8 |
Percentage of dividends added to Comparable FFO before Interest to Adjusted Interest Coverage | 50.00% |  |
Percentage of preferred dividends deducted from Adjusted Comparable FFO to Adjusted Net Debt | 50.00% |  |
Percentage of preferred shares added to net debt in Adjusted Comparable FFO to Adjusted Net Debt | 50.00% |  |
Annual dividend per share |  | CAD 0.16 | CAD 0.72
Minimum |  |  |
Investment [Line Items] |  |  |
Comparable funds from operations to adjusted interest coverage, Target | 4 |  |
Adjusted comparable funds from operations to adjusted net debt, Target | 20 |  |
Adjusted net debt to comparable earnings before interest, taxes, depreciation, and amortization, Target | 3.0 |  |
Maximum |  |  |
Investment [Line Items] |  |  |
Comparable funds from operations to adjusted interest coverage, Target | 5 |  |
Adjusted comparable funds from operations to adjusted net debt, Target | 25 |  |
Adjusted net debt to comparable earnings before interest, taxes, depreciation, and amortization, Target | 3.5 |  |

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- Definition Line items represent reporting concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 12 -Sentence Column A + Details
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