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Provisions - Schedule of Provisions (Detail) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of Provisions [line items] |  |  |  |  |
Environmental rehabilitation costs | $ 281.5 | $ 283.1 | $ 283.1 | $ 289.6 | $ 281.5
Silicosis settlement costs |  |  |  | 25.1 | 31.9
Other |  |  |  | 4.8 | 7.9
Total provisions |  |  |  | $ 319.5 | $ 321.3
Environmental rehabilitation costs Balance at beginning of the year | 281.5 | 283.1 |  |  |
Changes in estimates - continuing operations | 23.2 | (5.4) |  |  |
Changes in estimates - discontinued operations | 0.0 | 0.0 |  |  |
Interest expense - continuing operations | 11.7 | 12.1 | 10.7 |  |
Interest expense - discontinued operations | 0.0 | 0.2 |  |  |
Payments | (9.6) | (8.1) |  |  |
Disposal of subsidiary | 0.0 | (12.9) |  |  |
Translation adjustment | (17.2) | 12.5 |  |  |
Environmental rehabilitation costs balance at end of the year | 289.6 | 281.5 | $ 283.1 |  |
Total gross closure cost estimates | 399.9 | 381.0 |  |  |
South Africa [member] |  |  |  |  |
Disclosure of Provisions [line items] |  |  |  |  |
Total gross closure cost estimates | 41.8 | 41.8 |  |  |
Ghana [member] |  |  |  |  |
Disclosure of Provisions [line items] |  |  |  |  |
Total gross closure cost estimates | 100.4 | 98.1 |  |  |
Australia [member] |  |  |  |  |
Disclosure of Provisions [line items] |  |  |  |  |
Total gross closure cost estimates | 178.2 | 179.2 |  |  |
Peru [member] |  |  |  |  |
Disclosure of Provisions [line items] |  |  |  |  |
Total gross closure cost estimates | 79.1 | 61.9 |  |  |
CHILE |  |  |  |  |
Disclosure of Provisions [line items] |  |  |  |  |
Total gross closure cost estimates | $ 0.4 | $ 0.0 |  |  |

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