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Provisions - Silicosis Settlement Costs - Additional Information (Detail) R in Millions, $ in Millions | Dec. 31, 2020 USD ($) | Dec. 31, 2020 ZAR (R) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 ZAR (R) | Dec. 31, 2018 USD ($)
--- | --- | --- | --- | --- | ---
Disclosure of Provisions [line items] |  |  |  |  |
Provisions | $ 18.3 |  | $ 21.2 |  | $ 25.1
Silicosis [Member] |  |  |  |  |
Disclosure of Provisions [line items] |  |  |  |  |
Provisions | 18.3 | R 268.6 | $ 21.2 | R 297.1 |
Nominal amount of provision | $ 23.1 | R 339.3 |  |  |
Silicosis [Member] | Government bonds [member] |  |  |  |  |
Disclosure of Provisions [line items] |  |  |  |  |
Discount rate on government bonds | 6.67% | 6.67% | 10.08% | 10.08% |

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