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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, 2018 | Dec. 31, 2017
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Disclosure Of Credit Risk Exposure For Trade Receivables [line items] |  |
Total trade receivables | $ 23.4 | $ 46.6
Credit risk [member] |  |
Disclosure Of Credit Risk Exposure For Trade Receivables [line items] |  |
Total trade receivables | 23.4 | 46.6
Credit risk [member] | South Africa [member] |  |
Disclosure Of Credit Risk Exposure For Trade Receivables [line items] |  |
Total trade receivables | 0.0 | 12.8
Credit risk [member] | Ghana [member] |  |
Disclosure Of Credit Risk Exposure For Trade Receivables [line items] |  |
Total trade receivables | 8.1 | 10.4
Credit risk [member] | Australia [member] |  |
Disclosure Of Credit Risk Exposure For Trade Receivables [line items] |  |
Total trade receivables | 0.0 | 2.2
Credit risk [member] | Peru [member] |  |
Disclosure Of Credit Risk Exposure For Trade Receivables [line items] |  |
Total trade receivables | $ 15.3 | $ 21.2

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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 2018-01-01 -Paragraph 78 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_78_b&doctype=Standard -URIDate 2018-03-16 + Details
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