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Shareholders' equity - Common Shares (Details) - $ / shares | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Common shares |  |
Shareholders' equity |  |
Shares issued | 186,178,516 |
Shares issued - DRIP | 248,185 | 285,041
Preferred shares |  |
Shareholders' equity |  |
Shares issued | 0 |
Shares, par value (dollars per share) | $ 0 |

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Balance Type: | na
Period Type: | duration

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The number of shares issued by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_106_d&doctype=Standard -URIDate 2017-03-09 + Details
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Period Type: | instant

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- Definition The nominal value per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 79 -Subparagraph a -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_79_a_iii&doctype=Standard -URIDate 2017-03-09 + Details
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- Details
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- Details
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Balance Type: |
Period Type: |