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SHARE-BASED PAYMENTS - Deferred share unit plan (Details) - Deferred share unit plan $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) EquityInstruments $ / shares	Dec. 31, 2019 USD ($) EquityInstruments $ / shares
Share-based payment transaction
Minimum percentage of compensation for computing number of share units to outside director (as a percent)	50.00%
DSUs granted	203,000	269,000
Weighted average grant-date fair value (CDN$/ unit) | $ / shares	$ 8.66	$ 5.39
Number of share units outstanding	1,422,650
Recognized liability | $	$ 10.4	$ 7.8

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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]]

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The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement.

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The number of other equity instruments (ie other than share options) outstanding in a share-based payment arrangement.

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The weighted average exercise price of other equity instruments (ie other than share options) granted in a share-based payment arrangement. [Refer: Weighted average [member]]

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