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Risk Management Activities - Summary of the Exposure to Credit Risk for Trade Receivables by Geographic Region (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure Of Credit Risk Exposure For Trade Receivables [line items] |  |
Total trade receivables | $ 40.7 | $ 23.6
Credit risk [member] |  |
Disclosure Of Credit Risk Exposure For Trade Receivables [line items] |  |
Total trade receivables | 40.7 | 23.6
Credit risk [member] | South Africa [member] |  |
Disclosure Of Credit Risk Exposure For Trade Receivables [line items] |  |
Total trade receivables | 0.0 | 0.0
Credit risk [member] | Ghana [member] |  |
Disclosure Of Credit Risk Exposure For Trade Receivables [line items] |  |
Total trade receivables | 14.3 | 0.8
Credit risk [member] | Australia [member] |  |
Disclosure Of Credit Risk Exposure For Trade Receivables [line items] |  |
Total trade receivables | 2.7 | 0.0
Credit risk [member] | Peru [member] |  |
Disclosure Of Credit Risk Exposure For Trade Receivables [line items] |  |
Total trade receivables | $ 23.7 | $ 22.8

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- Definition The amount due from customers for goods and services sold. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 78 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_78_b&doctype=Standard -URIDate 2020-01-01 + Details
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