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Share-based Payments - Summary of Black-Scholes Option-Pricing Models (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Share Based Payments [Line Items] |  |  |
Weighted-average share price (US$) | $ 162.82 | $ 136.09 | $ 142.20
Bottom of Range |  |  |
Disclosure Of Share Based Payments [Line Items] |  |  |
Expected volatility (%) | 30.00% | 30.10% | 32.00%
Risk-free interest rate (%) | 0.10% | 1.40% | 2.40%
Expected life of stock options (years) | 2 years 7 months 6 days | 2 years 6 months | 2 years 4 months 24 days
Top of Range |  |  |
Disclosure Of Share Based Payments [Line Items] |  |  |
Expected volatility (%) | 42.80% | 35.20% | 34.70%
Risk-free interest rate (%) | 1.70% | 2.60% | 2.90%
Expected life of stock options (years) | 4 years 9 months 18 days | 4 years 9 months 18 days | 4 years 4 months 24 days

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- Definition Disclosure of share based payments. + References No definition available. + Details
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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 + 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]] + 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 + Details
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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 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 + Details
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