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Share-based payments - Outstanding DSUs Activity (Details) - Deferred Stock Units (DSU) | 12 Months Ended
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Dec. 31, 2017 CAD ($) shares | Dec. 31, 2016 shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Beginning balance, outstanding (in shares) | 4,131,229 | 3,796,051
Issued (in shares) | 69,742 | 87,665
Settlement of RSUs/PSUs (in shares) | 101,066 | 323,428
Dividends credited (in shares) | 203,442 | 183,852
Settled (in shares) | (195,951) | (259,767)
Ending balance, outstanding (in shares) | 4,309,528 | 4,131,229
Weighted average fair value at measurement date, other equity instruments granted | $ | $ 59 |

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- Definition The number of other equity instruments (ie other than share options) exercised or vested in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45&doctype=Standard -URIDate 2017-03-09 + Details
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