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Mining and Income Taxation - Summary of Estimated Available for Set-off Against Future Income Pre Tax (Detail) R in Millions, $ in Millions | Dec. 31, 2020 USD ($) | Dec. 31, 2020 ZAR (R) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 ZAR (R)
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South African - Components of Mining and Income Tax [Member] |  |  |  |
Disclosure of Estimated Amount Available for Set Off Against Future Income Pretax [Line Items] |  |  |  |
Gross unredeemed capital expenditure | $ 1,645.9 | R 24,178.8 | $ 1,743.8 | R 24,413.8
Gross tax losses | 204.3 | 3,001.6 | 218.9 | 3,065.0
Gross tax losses not recognised | 1.3 | 19.8 | 1.0 | 14.0
International operations [member] |  |  |  |
Disclosure of Estimated Amount Available for Set Off Against Future Income Pretax [Line Items] |  |  |  |
Gross unredeemed capital expenditure | 0.0 |  | 0.0 |
Gross tax losses | 566.5 |  | 514.4 |
Gross tax losses not recognised | 557.6 |  | 337.7 |
Gold Fields Operations Limited [Member] | South African - Components of Mining and Income Tax [Member] |  |  |  |
Disclosure of Estimated Amount Available for Set Off Against Future Income Pretax [Line Items] |  |  |  |
Gross unredeemed capital expenditure | 675.8 | 9,927.8 | 681.2 | 9,536.8
Gross tax losses | 150.7 | 2,213.8 | 196.2 | 2,747.0
Gross tax losses not recognised | 0.0 | 0.0 | 0.0 | 0.0
GFI Joint Venture Holdings (Proprietary) Limited [Member] | South African - Components of Mining and Income Tax [Member] |  |  |  |
Disclosure of Estimated Amount Available for Set Off Against Future Income Pretax [Line Items] |  |  |  |
Gross unredeemed capital expenditure | 970.1 | 14,251.0 | 1,062.6 | 14,877.0
Gross tax losses | 52.3 | 768.0 | 21.7 | 304.0
Gross tax losses not recognised | 0.0 | 0.0 | 0.0 | 0.0
Gold Fields Holdings Company Limited [member] | South African - Components of Mining and Income Tax [Member] |  |  |  |
Disclosure of Estimated Amount Available for Set Off Against Future Income Pretax [Line Items] |  |  |  |
Gross unredeemed capital expenditure | 0.0 | 0.0 | 0.0 | 0.0
Gross tax losses | 1.3 | 19.8 | 1.0 | 14.0
Gross tax losses not recognised | 1.3 | R 19.8 | 1.0 | R 14.0
Exploration Entities [member] | International operations [member] |  |  |  |
Disclosure of Estimated Amount Available for Set Off Against Future Income Pretax [Line Items] |  |  |  |
Gross unredeemed capital expenditure | 0.0 |  | 0.0 |
Gross tax losses | 231.2 |  | 125.7 |
Gross tax losses not recognised | 231.2 |  | 125.7 |
Minera Gold Fields Salares Norte [member] | International operations [member] |  |  |  |
Disclosure of Estimated Amount Available for Set Off Against Future Income Pretax [Line Items] |  |  |  |
Gross tax losses | 205.8 |  | 212.0 |
Gross tax losses not recognised | 205.8 |  | 212.0 |
Abosso Goldfields Limited [member] | International operations [member] |  |  |  |
Disclosure of Estimated Amount Available for Set Off Against Future Income Pretax [Line Items] |  |  |  |
Gross unredeemed capital expenditure | 0.0 |  | 0.0 |
Gross tax losses | 44.5 |  | 176.7 |
Gross tax losses not recognised | 35.6 |  | 0.0 |
Gold Fields Ghana Limited [member] | International operations [member] |  |  |  |
Disclosure of Estimated Amount Available for Set Off Against Future Income Pretax [Line Items] |  |  |  |
Gross unredeemed capital expenditure | 0.0 |  | 0.0 |
Gross tax losses | 85.0 |  | 0.0 |
Gross tax losses not recognised | $ 85.0 |  | $ 0.0 |

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