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Risk Management Activities - Schedule Of Effect Of A Change In Loss On Financial Instruments To Value The Gold Derivative Contracts (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Value Of Reasonably Possible Decrease In Forward Prices (US$150) [Member] |  |
Disclosure of Financial Risk Management [line items] |  |
(Increase)/decrease in loss on financial instruments | $ 35.4 | $ 120.8
Value Of Reasonably Possible Decrease in Forward Prices (US$100) [Member] |  |
Disclosure of Financial Risk Management [line items] |  |
(Increase)/decrease in loss on financial instruments | 20.1 | 85.7
Value Of Reasonably Possible Decrease In Forward Prices (US$50) [Member] |  |
Disclosure of Financial Risk Management [line items] |  |
(Increase)/decrease in loss on financial instruments | 8.6 | 45.4
Value Of Reasonably Possible Increase in Forward Prices US$50 [Member] |  |
Disclosure of Financial Risk Management [line items] |  |
(Increase)/decrease in loss on financial instruments | (6.5) | (48.7)
Value Of Reasonably Possible Increase in Forward Prices US$100 [Member] |  |
Disclosure of Financial Risk Management [line items] |  |
(Increase)/decrease in loss on financial instruments | (11.4) | (99.4)
Value Of Reasonably Possible Increase In Forward Prices US$150 [Member] |  |
Disclosure of Financial Risk Management [line items] |  |
(Increase)/decrease in loss on financial instruments | (15.0) | (151.1)
Percentage Of Reasonably Possible Decrease In Interest Rates (1.5%) [Member] |  |
Disclosure of Financial Risk Management [line items] |  |
(Increase)/decrease in loss on financial instruments | (5.2) | 5.9
Percentage Of Reasonably Possible Decrease In Interest Rates (1.0%) [Member] |  |
Disclosure of Financial Risk Management [line items] |  |
(Increase)/decrease in loss on financial instruments | (2.9) | 4.0
Percentage Of Reasonably Possible Decrease In Interest Rates (0.5%) [Member] |  |
Disclosure of Financial Risk Management [line items] |  |
(Increase)/decrease in loss on financial instruments | (0.8) | 2.0
Percentage Of Reasonably Possible Increase in Interest Rates 0.5% [Member] |  |
Disclosure of Financial Risk Management [line items] |  |
(Increase)/decrease in loss on financial instruments | 3.0 | (2.1)
Percentage Of Reasonably Possible Increase In Interest Rates 1.0% [Member] |  |
Disclosure of Financial Risk Management [line items] |  |
(Increase)/decrease in loss on financial instruments | 4.8 | (4.2)
Percentage Of Reasonably Possible Increase In Interest Rates 1.5% [Member] |  |
Disclosure of Financial Risk Management [line items] |  |
(Increase)/decrease in loss on financial instruments | $ 6.4 | $ (6.3)

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- Definition The amount of increase (decrease) in the fair value measurement of liabilities, recognised in profit or loss after tax, due to a reasonably possible increase in an unobservable input. [Refer: Tax income (expense)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 13 -IssueDate 2020-01-01 -Paragraph 93 -Subparagraph h -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_h_ii&doctype=Standard -URIDate 2020-01-01 + Details
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