Share-based compensation - Fair value inputs (Details) - $ / shares	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Share-Based Payment Arrangements [Abstract]
Weighted average stock price valuation (in cad per share)	$ 54.26	$ 51.01
Weighted average exercise price (in cad per share)	$ 54.26	$ 51.01
Risk free interest rate (as a percent)	2.03%	1.13%
Expected life in years	6.25	6.25
Expected dividend yield (as a percent)	0.00%	0.00%
Volatility (as a percent)	61.00%	60.00%
Weighted average fair value of options issued (in cad per share)	$ 31.67	$ 28.63

Share-Based Payment Arrangements [Abstract]

No definition available.

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- Definition

Weighted Average Fair Value Price At Measurement Date, Share Options Granted

+ 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 2021-01-01
-Paragraph 47
-Subparagraph a
-Clause i
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_47_a_i&doctype=Standard
-URIDate 2021-03-24

+ Details

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- Definition

The option life of share options granted.

+ References

+ Details

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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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+ Details

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- Definition

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

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+ Details

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- Definition

The weighted average exercise price of share options granted in a share-based payment arrangement. [Refer: Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2021-01-01
-Paragraph 45
-Subparagraph b
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b_ii&doctype=Standard
-URIDate 2021-03-24

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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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