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Provisions - Schedule of Provisions (Detail) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of Provisions [Line Items] |  |  |  |  |  |  |  |
Environmental rehabilitation costs | $ 283.1 | $ 275.4 |  | $ 275.4 |  | $ 281.5 | $ 283.1 |
South Deep dividend |  |  |  |  |  | 6.4 | 6.4 |
Silicosis settlement costs | 31.9 | 0.0 |  |  |  |  |  |
Other |  |  |  |  |  | 1.5 | 2.2 |
Total provisions |  |  |  |  |  | $ 321.3 | $ 291.7 | [1]
Environmental rehabilitation costs Balance at beginning of the year | 283.1 | 275.4 |  |  |  |  |  |
Changes in estimates - Continuing operations | (5.4) | 4.9 |  |  |  |  |  |
Changes in estimates - discontinued operations | 0.0 | 0.1 |  |  |  |  |  |
Interest expense - Continuing operations | 12.1 | 10.7 | [1] | 11.7 | [1] |  |  |
Interest expense - discontinued operations | 0.2 | 0.2 |  |  |  |  |  |
Payments | (8.1) | (7.4) |  |  |  |  |  |
Disposal of subsidiary | (12.9) | 0.0 |  |  |  |  |  |
Translation adjustment | 12.5 | (0.8) |  |  |  |  |  |
Environmental rehabilitation costs balance at end of the year | 281.5 | 283.1 |  | $ 275.4 |  |  |  |
Total gross closure cost estimates | 381.0 | 380.8 |  |  |  |  |  |
South Africa [member] |  |  |  |  |  |  |  |
Disclosure of Provisions [Line Items] |  |  |  |  |  |  |  |
Total gross closure cost estimates | 41.8 | 37.1 |  |  |  |  |  |
Ghana [member] |  |  |  |  |  |  |  |
Disclosure of Provisions [Line Items] |  |  |  |  |  |  |  |
Total gross closure cost estimates | 98.1 | 105.3 |  |  |  |  |  |
Australia [member] |  |  |  |  |  |  |  |
Disclosure of Provisions [Line Items] |  |  |  |  |  |  |  |
Total gross closure cost estimates | 179.2 | 181.8 |  |  |  |  |  |
Peru [member] |  |  |  |  |  |  |  |
Disclosure of Provisions [Line Items] |  |  |  |  |  |  |  |
Total gross closure cost estimates | $ 61.9 | $ 56.6 |  |  |  |  |  |
[1] | As Restated - Refer note 40 for further details.

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