Equity - Summary of Weighted Average Assumptions (Detail)	12 Months Ended
Dec. 31, 2020 yr $ / shares	Dec. 31, 2019 yr $ / shares
Equity [abstract]
Weighted average exercise price \| $ / shares	$ 14.42	$ 28.62
Dividend yield	2.13%	1.05%
Risk-free interest rate	1.19%	1.81%
Expected option life \| yr	6.1	5.9
Expected volatility	41.00%	41.00%
Forfeiture rate	1.16%	0.55%

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
-Number 2
-IssueDate 2020-01-01
-Paragraph 47
-Subparagraph a
-Clause i
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-URIDate 2020-01-01

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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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- Definition

The exercise price of share options granted.

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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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- Definition

Forfeiture rate share options granted.

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