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SHARE-BASED PAYMENTS - Deferred share unit plan (Details) - DSUs $ in Millions	12 Months Ended
	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

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
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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
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-IssueDate 2018-01-01
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

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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