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Share-Based Payments - Summary of Fair Value of Equity Instruments Granted (Detail) (Detail) - Performance Shares [Member] - Gold Fields Limited 2012 Share Plan Amended [member] | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Monte Carlo simulation |  |  |
Weighted average historical volatility (based on a statistical analysis of the share price on a weighted moving average basis for the expected term of the option) | 58.40% | 44.70% | 58.60%
Expected term (years) | 3 years | 3 years | 3 years
Dividend yield | n/a | n/a | n/a
Weighted average three-year risk-free interest rate (based on US interest rates) | 0.30% | 1.40% | 2.00%
Weighted average fair value (United States Dollar) | 6.4 | 5.7 | 5.0

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- Definition The percentage of an expected dividends used to calculate the fair value of share options granted. + References No definition available. + Details
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- Definition Expected term in years share options granted. + References No definition available. + 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). + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award fair value of equity instruments methodology. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award fair value of equity instruments weighted average fair value. + 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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- Details
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- Details
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