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Common Shares - Premium Dividend, Dividend Reinvestment, and Optimal Common Share Purchase Plan (Details) - shares shares in Millions |  | 12 Months Ended
--- | --- | ---
Feb. 21, 2012 | Dec. 31, 2017 | Dec. 31, 2016
Common shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of shares issued |  | 0.0 | 3.9
Dividend Reinvestment Plan |  |  |
Disclosure of classes of share capital [line items] |  |  |
Discount on average market price of common shares | 3.00% |  |
Premium cash payment | 102.00% |  |

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- Definition The increase (decrease) in the number of shares outstanding. [Refer: Number of shares outstanding] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 79 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_79_a_iv&doctype=Standard -URIDate 2017-03-09 + Details
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