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STOCK-BASED COMPENSATION - Principal assumptions used to determine fair value of stock options (Details)	12 Months Ended
	Dec. 31, 2019 CAD ($)	Dec. 31, 2018 CAD ($) step
Share-based Payment Arrangements [Abstract]
Weighted average fair value | $	$ 8.11	$ 8.42
Risk-free interest rate	1.90%	1.70%
Dividend yield	2.80%	3.30%
Volatility of Class B Non-Voting Shares	16.40%	20.10%
Weighted average expected life	5.5	6.2
Weighted average time to vest		2 years 6 months
Weighted average time to expiry		10 years
Employee exit rate		4.90%
Suboptimal exercise factor		1.4
Lattice steps | step		50

X

- Definition

The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2019-01-01
-Paragraph 47
-Subparagraph a
-Clause i
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_47_a_i&doctype=Standard
-URIDate 2019-03-27

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- Definition

The option life of share options granted.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2019-01-01
-Paragraph 47
-Subparagraph a
-Clause i
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_47_a_i&doctype=Standard
-URIDate 2019-03-27

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- Definition

The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). [Refer: Government [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2019-01-01
-Paragraph 47
-Subparagraph a
-Clause i
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_47_a_i&doctype=Standard
-URIDate 2019-03-27

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- Definition

The percentage of an expected dividend used to calculate the fair value of share options granted.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2019-01-01
-Paragraph 47
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-Clause i
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-URIDate 2019-03-27

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- Definition

The weighted average fair value of share options granted during the period at the measurement date. [Refer: Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2019-01-01
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- Definition

Description Of Other Inputs To Options Pricing Model, Lattice Steps, Share Options Granted

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Description Of Suboptimal Exercise Factor, Share Options Granted

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- Definition

Expected Employee Exit Rate, Share Options Granted

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Share-based Payment Arrangements [Abstract]

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Weighted Average Expiration Period, Share Options Granted

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- Definition

Weighted Average Vesting Period, Share Options Granted

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