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Share-based payments - Fair Value Assumptions (Details)	12 Months Ended
	Dec. 31, 2020 CAD ($) year $ / shares	Dec. 31, 2019 CAD ($) year $ / shares
Share-based Payment Arrangements [Abstract]
Weighted average fair value per option granted (CAD per share)	$ 1.55	$ 2.34
Weighted average share price (CAD per share) | $ / shares	$ 63	$ 58
Weighted average exercise price	$ 65	$ 58
Expected dividend growth	5.00%	5.00%
Expected volatility	12.00%	14.00%
Risk-free interest rate	1.00%	2.00%
Expected life (years) | year	4	4

X

- Definition

Exercise Price Share Options Granted

+ References

No definition available.

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- Definition

Share-based Payment Arrangements [Abstract]

+ References

No definition available.

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- 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 2020-01-01
-Paragraph 47
-Subparagraph a
-Clause i
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_47_a_i&doctype=Standard
-URIDate 2020-01-01

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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 2020-01-01
-Paragraph 47
-Subparagraph a
-Clause i
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_47_a_i&doctype=Standard
-URIDate 2020-01-01

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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 2020-01-01
-Paragraph 47
-Subparagraph a
-Clause i
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_47_a_i&doctype=Standard
-URIDate 2020-01-01

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- Definition

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

+ References

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-Name IFRS
-Number 2
-IssueDate 2020-01-01
-Paragraph 47
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-Clause i
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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 2020-01-01
-Paragraph 47
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- Definition

The weighted average share price used as input to the option pricing model to calculate the fair value of share options granted. [Refer: Option pricing model [member]; Weighted average [member]]

+ References

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