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Royalties - Summary of Royalties (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of information about royalty arrangements [line items] |  |  |
Total royalties | $ (62.5) | $ (62.0) | $ (78.4)
South Africa [member] |  |  |
Disclosure of information about royalty arrangements [line items] |  |  |
Total royalties | $ (1.0) | $ (1.8) | $ (1.8)
Royalty percentage | 0.50% | 0.50% | 0.50%
Foreign [member] |  |  |
Disclosure of information about royalty arrangements [line items] |  |  |
Total royalties | $ (61.5) | $ (60.2) | $ (76.6)
Australia [member] |  |  |
Disclosure of information about royalty arrangements [line items] |  |  |
Total royalties | $ (27.9) | $ (27.8) | $ (27.3)
Royalty percentage | 2.50% | 2.50% | 2.50%
Ghana [member] |  |  |
Disclosure of information about royalty arrangements [line items] |  |  |
Total royalties | $ (31.3) | $ (27.1) | $ (44.6)
Royalty percentage | 3.00% | 3.00% | 5.00%
Peru [member] |  |  |
Disclosure of information about royalty arrangements [line items] |  |  |
Royalty percentage | 4.00% | 4.60% | 6.40%

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- Definition The amount of expense arising from royalties. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_85&doctype=Standard -URIDate 2018-03-16 + Details
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- Details
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- Details
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- Details
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