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Equity-Accounted Investees - Summary of Equity-Accounted Investees (Parenthetical) (Detail) - USD ($) $ in Millions |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 29, 2018 | Mar. 31, 2012 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2015
Disclosure of equity-accounted investees [line items] |  |  |  |  |  |  |  |
cash and cash equivalents includes in cash and cash equivalents |  |  | $ 399.7 | $ 479.0 | $ 526.7 |  |  | $ 440.0
Profit on disposal |  |  | (51.6) | 4.0 | 48.0 |  |  |
Rusoro Mining Limited ("Rusoro") |  |  | 225.1 | 171.3 | $ 0.0 |  |  |
Investment in associate |  |  | 0.0 | 0.0 |  |  |  |
Top of range [member] |  |  |  |  |  |  |  |
Disclosure of equity-accounted investees [line items] |  |  |  |  |  |  |  |
Nominal value |  |  | 0.1 |  |  |  |  |
Asanko Gold Ghana Limited [member] |  |  |  |  |  |  |  |
Disclosure of equity-accounted investees [line items] |  |  |  |  |  |  |  |
Interest on joint venture | 45.00% |  |  |  |  |  |  |
Government of Ghana ownership retained | 10.00% |  |  |  |  |  |  |
Shika Group Finance Limited [member] |  |  |  |  |  |  |  |
Disclosure of equity-accounted investees [line items] |  |  |  |  |  |  |  |
Interest on joint venture | 50.00% |  |  |  |  |  |  |
Adansi Gold Company Ghana Limited [member] |  |  |  |  |  |  |  |
Disclosure of equity-accounted investees [line items] |  |  |  |  |  |  |  |
Interest on joint venture | 50.00% |  |  |  |  |  |  |
Far Southeast Gold Resources Incorporated [member] |  |  |  |  |  |  |  |
Disclosure of equity-accounted investees [line items] |  |  |  |  |  |  |  |
Option to acquire |  | 40.00% |  |  |  |  | 60.00% |
Non-refundable down payment |  | $ 110.0 |  |  |  | $ 66.0 | $ 44.0 |
Remaining percentage of ownership not yet exercised |  | 20.00% |  |  |  |  |  |
Unlisted shares at cost |  |  | 230.0 | 230.0 |  |  |  |
Equity contribution |  |  | 92.2 | 79.3 |  |  |  |
Cumulative impairment |  |  | (138.3) | (101.4) |  |  |  |
Share of accumulated losses brought forward |  |  | (79.3) | (77.7) |  |  |  |
Share of loss after taxation |  |  | (12.9) | (1.6) |  |  |  |
Total investment in joint venture3 |  |  | $ 91.7 | $ 128.6 |  |  |  |
Option remains exercisable |  |  | 20.00% |  |  |  |  |
Option to acquire shares |  |  | 20.00% |  |  |  |  |
Interest on joint venture |  |  | 40.00% | 40.00% | 40.00% |  |  |
Asanko Gold [member] |  |  |  |  |  |  |  |
Disclosure of equity-accounted investees [line items] |  |  |  |  |  |  |  |
Share of loss after taxation |  |  | $ 1.1 |  |  |  |  |
Total investment in joint venture3 |  |  | 86.9 |  |  |  |  |
cash and cash equivalents includes in cash and cash equivalents |  |  | $ 21.6 |  |  |  |  |
Asanko Gold [member] | Asanko Gold Ghana Limited [member] |  |  |  |  |  |  |  |
Disclosure of equity-accounted investees [line items] |  |  |  |  |  |  |  |
Interest on joint venture |  |  | 45.00% |  |  |  |  |
Government of Ghana ownership retained |  |  | 10.00% |  |  |  |  |
Asanko Gold [member] | Shika Group Finance Limited [member] |  |  |  |  |  |  |  |
Disclosure of equity-accounted investees [line items] |  |  |  |  |  |  |  |
Interest on joint venture |  |  | 50.00% |  |  |  |  |
Asanko Gold [member] | Adansi Gold Company Ghana Limited [member] |  |  |  |  |  |  |  |
Disclosure of equity-accounted investees [line items] |  |  |  |  |  |  |  |
Interest on joint venture |  |  | 50.00% |  |  |  |  |
Marverix Metals Incorporated [Member] |  |  |  |  |  |  |  |
Disclosure of equity-accounted investees [line items] |  |  |  |  |  |  |  |
Common Shares |  |  |  |  | 42,850,000 |  |  |
Common shares |  |  | 10,000,000 |  | 10,000,000 |  |  |
Percentage of ownership on diluted basis |  |  | 20.50% |  |  |  |  |
Common shares issued |  |  | 60,000,000 |  |  |  |  |
Common shares purchase warrants |  |  | 10,000,000 |  |  |  |  |
Interest on listed entity |  |  | 20.00% | 28.00% |  |  |  |
Profit on disposal |  |  | $ 4.0 |  | $ 48.0 |  |  |
Listed shares at cost |  |  | 42.1 | $ 42.1 |  |  |  |
Profit on dilution of Gold Fields' interest in Maverix |  |  | 4.0 | 0.0 |  |  |  |
Transaction costs capitalised |  |  | 0.3 | 0.3 |  |  |  |
Share of accumulated profits brought forward |  |  | 0.3 | 0.0 |  |  |  |
Share of profit after taxation |  |  | 0.9 | 0.3 |  |  |  |
Rusoro Mining Limited ("Rusoro") |  |  | 47.6 | 42.7 | $ 0.0 |  |  |
Fair value of investment based on quoted market price |  |  | $ 74.7 | $ 57.2 |  |  |  |
Rusoro Mining Limited [member] |  |  |  |  |  |  |  |
Disclosure of equity-accounted investees [line items] |  |  |  |  |  |  |  |
Percentage of remaining shares |  |  | 25.70% | 25.70% |  |  |  |
Rusoro Mining Limited ("Rusoro") |  |  | $ 0.0 | $ 0.0 |  |  |  |
Fair value of investment based on quoted market price |  |  | $ 13.4 | $ 7.7 |  |  |  |
Lepanto Consolidated Mining Company [member] |  |  |  |  |  |  |  |
Disclosure of equity-accounted investees [line items] |  |  |  |  |  |  |  |
Option fees |  |  |  |  |  |  | $ 10.0 |
Percentage of remaining shares |  | 60.00% |  |  |  |  |  |

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