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SHARE-BASED PAYMENTS - Deferred share unit plan (Details) - DSUs $ in Millions | 12 Months Ended |  |
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Dec. 31, 2018 CAD ($) EquityInstruments | Dec. 31, 2017 CAD ($) EquityInstruments | Dec. 31, 2018 USD ($) EquityInstruments | Dec. 31, 2017 USD ($)
Summary of information about DSUs granted and outstanding |  |  |  |
Minimum percentage of compensation for computing number of share units to outside director (as a percent) |  |  | 50.00% |
DSUs granted | EquityInstruments | 312,000 | 297,000 |  |
Weighted average grant-date fair value (CDN$/ unit) | $ | $ 4.39 | $ 5.15 |  |
Number of share units outstanding | EquityInstruments |  |  | 1,701,799 |
Liability recognized in respect of DSUs | $ |  |  | $ 5.5 | $ 7.0

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- Definition The amount of liabilities arising from share-based payment transactions. Share-based payment transactions are transactions in which the entity: (a) receives goods or services from the supplier of those goods or services (including an employee) in a share-based payment arrangement; or (b) incurs an obligation to settle the transaction with the supplier in a share-based payment arrangement when another group entity receives those goods or services. [Refer: Share-based payment arrangements [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 51 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_51_b_i&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_47_b&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The number of other equity instruments (ie other than share options) outstanding in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The percentage on value of compensation for computing the number of share units in share based payment arrangement. + References No definition available. + Details
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- Definition The weighted average fair value of other equity instruments (ie other than share options) granted in a share-based payment arrangement. + References No definition available. + Details
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