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Contingent Liabilities - Additional Information (Detail) R in Millions, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2017 ZAR (R) | Dec. 31, 2016 USD ($) | Dec. 31, 2017 ZAR (R) | Jun. 30, 2017 USD ($) | Dec. 31, 2015 USD ($)
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |
Provisions | $ 321.3 |  | $ 291.7 | [1] |  |  |
Percentage of ownership interest in joint venture | 50.00% | 50.00% |  |  |  |  |
Amount of consolidated deferred tax asset | $ 72.0 |  | $ 48.7 | [1] |  |  | $ 54.1
South Deep Tax Dispute [Member] |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |
Tax rate for capital allowance | 12.00% | 12.00% |  |  |  |  |
Allowable percentage on actual capital expenditure on developing mine | 12.00% | 12.00% |  |  |  |  |
Alleged thefts [Member] | Randgold and Exploration Summons [Member] |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |
Amount of summons claims computed pursuant to allegedly received | R |  |  |  |  | R 43,700.0 |  |
GFI Joint Venture Holdings (Proprietary) Limited [Member] | South African Revenue Service [Member] | Additional capital allowances [Member] |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |
Amount of unredeemed capital expenditure included in the deferred tax asset balance | $ 0.0 |  |  |  | 0.0 |  |
Tax effect of unredeemed capital expenditure included in the deferred tax asset balance | 54.7 | R 687.6 |  |  |  |  |
Additional capital allowance balance restated by SARS recognised | 182.2 |  |  |  | 2,292.0 |  |
South Deep Tax Dispute [Member] |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |
Percentage of ownership interest in joint venture |  |  | 50.00% |  |  |  |
South Deep Tax Dispute [Member] | Temporary Differences [Member] |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |
Amount of unredeemed capital expenditure included in the deferred tax asset balance | 1,834.4 |  |  |  | 23,076.4 |  |
Amount of consolidated deferred tax asset | 550.4 |  |  |  | 6,923.0 |  |
South Deep Tax Dispute [Member] | GFIJVH [Member] | Unredeemed Capital Expenditure [Member] |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |
Amount of unredeemed capital expenditure included in the deferred tax asset balance | 743.3 |  |  |  | 9,350.3 |  |
Tax effect of unredeemed capital expenditure included in the deferred tax asset balance | 223.0 | 2,805.1 |  |  |  |  |
South Deep Tax Dispute [Member] | GFIJVH [Member] | Capital Allowance Balance [Member] |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |
Amount of unredeemed capital expenditure included in the deferred tax asset balance | 182.2 |  |  |  | 2,292.0 |  |
Tax effect of unredeemed capital expenditure included in the deferred tax asset balance | 54.7 | 687.6 |  |  |  |  |
South Deep Tax Dispute [Member] | Gold Fields Operations [member] | Additional capital allowances [Member] |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |
Amount of unredeemed capital expenditure included in the deferred tax asset balance | 716.4 |  |  |  | 9,011.9 |  |
Tax effect of unredeemed capital expenditure included in the deferred tax asset balance | 214.9 | 2,703.6 |  |  |  |  |
South Deep Tax Dispute [Member] | GFO [Member] | Assessed Losses [Member] |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |
Gross deductible temporary differences, assessed loss balance | 192.5 | 2,422.2 |  |  |  |  |
Gross deductible temporary differences, tax effect on assessed loss balance | 57.8 | R 726.7 |  |  |  |  |
Silicosis [Member] |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |
Provisions | 31.9 |  |  |  |  | $ 30.2 |
Nominal amount of provision | $ 40.5 |  |  |  | 509.0 | $ 40.5 |
South Deep Mine [member] | GFI Joint Venture Holdings (Proprietary) Limited [Member] |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |
Percentage of ownership interest in joint venture |  |  | 50.00% |  |  |  |
Based On Value Of Shares [Member] | Alleged thefts [Member] | Randgold and Exploration Summons [Member] |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |
Amount of summons claims computed pursuant to allegedly received | R |  |  |  |  | R 26,900.0 |  |
[1] | As Restated - Refer note 40 for further details.

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