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Royalties - Summary of Royalties (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of information about royalty arrangements [line items] |  |  |
Total royalties | $ (105.0) | $ (73.7) | $ (62.5)
Group excluding Asanko [member] |  |  |
Disclosure of information about royalty arrangements [line items] |  |  |
Total royalties | $ (105.0) | $ (73.7) | $ (62.5)
South Africa [member] |  |  |
Disclosure of information about royalty arrangements [line items] |  |  |
Royalty percentage | 0.50% | 0.50% | 0.50%
South Africa [member] | South deep [member] |  |  |
Disclosure of information about royalty arrangements [line items] |  |  |
Total royalties | $ (2.0) | $ (1.6) | $ (1.0)
Foreign [member] |  |  |
Disclosure of information about royalty arrangements [line items] |  |  |
Total royalties | (103.0) | (72.1) | (61.5)
Australia [member] |  |  |
Disclosure of information about royalty arrangements [line items] |  |  |
Total royalties | $ (44.3) | $ (30.5) | $ (27.9)
Royalty percentage | 2.50% | 2.50% | 2.50%
Ghana [member] |  |  |
Disclosure of information about royalty arrangements [line items] |  |  |
Total royalties | $ (62.5) | $ (43.8) | $ (31.3)
Royalty percentage | 4.10% | 3.50% | 3.00%
Peru [member] |  |  |
Disclosure of information about royalty arrangements [line items] |  |  |
Royalty percentage | 3.90% | 3.60% | 4.00%

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