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Provisions - Schedule of Provisions (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of Provisions [line items] |  |  |
Silicosis settlement costs | $ 18.3 | $ 21.2 |
Other | 3.1 | 4.2 |
Total provisions | 402.9 | 395.7 |
Environmental rehabilitation costs balance at beginning of the year | 370.3 | 289.6 |
Changes in estimates | (5.1) | 79.5 |
Interest expense | 10.7 | 11.7 | $ 11.7
Payments | (12.9) | (10.7) |
Translation adjustment | 18.5 | 0.2 |
Environmental rehabilitation costs balance at end of the year | 381.5 | 370.3 | $ 289.6
Total gross closure cost estimates | 466.6 | 436.3 |
Current portion of provisions | (23.6) | (4.6) |
Non-current portion of provisions | 379.3 | 391.1 |
Current portion of environmental rehabilitation costs | (19.6) | 0.0 |
Non-current portion of environmental rehabilitation costs | 361.9 | 370.3 |
South Africa [member] |  |  |
Disclosure of Provisions [line items] |  |  |
Total gross closure cost estimates | 43.9 | 45.9 |
Ghana [member] |  |  |
Disclosure of Provisions [line items] |  |  |
Total gross closure cost estimates | 104.4 | 105.6 |
Australia [member] |  |  |
Disclosure of Provisions [line items] |  |  |
Total gross closure cost estimates | 218.8 | 198.2 |
Peru [member] |  |  |
Disclosure of Provisions [line items] |  |  |
Total gross closure cost estimates | 97.4 | 86.2 |
CHILE |  |  |
Disclosure of Provisions [line items] |  |  |
Total gross closure cost estimates | $ 2.1 | $ 0.4 |

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