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Mining and Income Taxation - Summary of Components of Mining and Income Tax (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2014 | May 30, 2018
Disclosure of Components of Mining and Income Tax [Line Items] |  |  |  |  |
South African statutory mining tax rate | 34.00% | 34.00% | 34.00% |  |
Deferred tax assets | $ 240.0 | $ 265.5 |  |  |
South African Revenue Service [Member] |  |  |  |  |
Disclosure of Components of Mining and Income Tax [Line Items] |  |  |  |  |
Gross recognised capital allowance disallowed |  |  |  | $ 182.2 |
Additional capital allowance recognised |  |  |  |  | $ 185.1
Capital allowance recognized |  |  |  | $ 925.5 |
Additional tax effect recognised |  |  |  |  | $ 53.7
Deferred tax assets not recognized [member] | Cerro Cerona and Damang [member] |  |  |  |  |
Disclosure of Components of Mining and Income Tax [Line Items] |  |  |  |  |
Deferred tax assets at Cerro Cerona, Damang and Ghanaian | 0.1 | $ 3.3 | $ 14.9 |  |
Deferred tax assets not recognized [member] | Ghanaian [member] |  |  |  |  |
Disclosure of Components of Mining and Income Tax [Line Items] |  |  |  |  |
Deferred tax assets at Cerro Cerona, Damang and Ghanaian | 50.9 |  |  |  |
Deferred tax assets recognized [member] | Salaries Norte [member] |  |  |  |  |
Disclosure of Components of Mining and Income Tax [Line Items] |  |  |  |  |
Deferred tax assets assessed losses recognised | 12.8 |  |  |  |
Deferred tax assets recognized [member] | Ghanaian [member] |  |  |  |  |
Disclosure of Components of Mining and Income Tax [Line Items] |  |  |  |  |
Deferred tax assets | 50.9 |  |  |  |
Deferred tax asset losses on financial instruments | 41.0 |  |  |  |
Deferred tax asset losses are ring fenced for tax purposes | 120.6 |  |  |  |
Deferred tax assets recognized [member] | Damang [member] |  |  |  |  |
Disclosure of Components of Mining and Income Tax [Line Items] |  |  |  |  |
Deferred tax assets at Cerro Cerona, Damang and Ghanaian |  |  | $ 6.5 |  |
Deferred tax assets recognized [member] | Tarkwa [member] |  |  |  |  |
Disclosure of Components of Mining and Income Tax [Line Items] |  |  |  |  |
Deferred tax assets | 9.9 |  |  |  |
Deferred tax assets provision for expected credit loss | $ 29.0 |  |  |  |

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