STOCK-BASED COMPENSATION - Principal assumptions used to determine fair value of stock options (Details) - CAD ($)	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Share-based Payment Arrangements [Abstract]
Weighted average fair value	$ 7.46	$ 5.86
Risk-free interest rate	0.30%	1.70%
Dividend yield	3.40%	3.40%
Volatility of Class B Non-Voting Shares	23.10%	16.10%
Weighted average expected life	5.1	5.5

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-IssueDate 2021-01-01
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- Definition

The option life of share options granted.

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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]]

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

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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 2021-01-01
-Paragraph 47
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_47_a&doctype=Standard
-URIDate 2021-03-24

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- Definition

Share-based Payment Arrangements [Abstract]

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No definition available.

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