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SHARE-BASED PAYMENTS - Deferred share unit plan (Details) - DSUs Option in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2017 CAD ($) Option	Dec. 31, 2016 CAD ($) Option	Dec. 31, 2017 USD ($) Option	Dec. 31, 2016 USD ($)
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
DSUs granted | Option	297	308
Weighted average grant-date fair value (CDN$/ unit) | $	$ 5.15	$ 4.97
Number of share units outstanding | Option			1,618,348
Liability recognized in respect of DSUs | $			$ 7.0	$ 4.1

X

- 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
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-IssueDate 2017-01-01
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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
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-IssueDate 2017-01-01
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2017-01-01
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The number of other equity instruments (ie other than share options) outstanding in a share-based payment arrangement.

+ References

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The percentage on value of compensation for computing the number of share units in share based payment arrangement.

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The weighted average fair value of other equity instruments (ie other than share options) granted in a share-based payment arrangement.

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