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Royalties - Summary of Royalties (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of information about royalty arrangements [line items] |  |  |  |  |
Total royalties | $ (62.0) | $ (78.4) | [1] | $ (73.9) | [1]
South Africa [member] |  |  |  |  |
Disclosure of information about royalty arrangements [line items] |  |  |  |  |
Total royalties | $ (1.8) | $ (1.8) |  | $ (1.2) |
Royalty percentage | 0.50% | 0.50% |  | 0.50% |
Foreign [member] |  |  |  |  |
Disclosure of information about royalty arrangements [line items] |  |  |  |  |
Total royalties | $ (60.2) | $ (76.6) |  | $ (72.7) |
Australia [member] |  |  |  |  |
Disclosure of information about royalty arrangements [line items] |  |  |  |  |
Total royalties | $ (27.8) | $ (27.3) |  | $ (25.8) |
Royalty percentage | 2.50% | 2.50% |  | 2.50% |
Ghana [member] |  |  |  |  |
Disclosure of information about royalty arrangements [line items] |  |  |  |  |
Total royalties | $ (27.1) | $ (44.6) |  | $ (43.8) |
Royalty percentage | 3.00% | 5.00% |  | 5.00% |
Peru [member] |  |  |  |  |
Disclosure of information about royalty arrangements [line items] |  |  |  |  |
Royalty percentage | 4.60% | 6.40% |  | 4.00% |
[1] | As Restated - Refer note 40 for further details.

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