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Equity-Accounted Investees - Summary of Equity-Accounted Investees (Parenthetical) (Detail) - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Mar. 29, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2016 | Dec. 31, 2017
Disclosure of equity-accounted investees [line items] |  |  |  |  |  |
Total investment in joint venture |  | $ 233.3 | $ 172.0 |  |  |
cash and cash equivalents includes in cash and cash equivalents |  | 886.8 | 515.0 | $ 219.7 |  | $ 393.8
Profit on disposal |  | (0.2) | 1.2 | $ (51.6) |  |
Rusoro Mining Limited ("Rusoro") |  | 233.3 | 172.0 |  |  |
Investment in associate |  | 0.0 | 0.0 |  |  |
Property, plant and equipment |  | 4,771.2 | 4,657.1 |  |  |
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% |  |  |  |  |
cash and cash equivalents includes in cash and cash equivalents |  | $ 64.3 | 43.7 |  |  |
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% |  |  |  |  |
FSE [member] |  |  |  |  |  |
Disclosure of equity-accounted investees [line items] |  |  |  |  |  |
Remaining percentage of ownership not yet exercised |  | 20.00% |  |  |  |
Unlisted shares at cost |  | $ 230.0 | 230.0 |  |  |
Equity contribution |  | 95.2 | 93.6 |  |  |
Cumulative impairment |  | (85.6) | (147.9) |  |  |
Share of accumulated losses brought forward |  | (93.6) | (92.2) |  |  |
Share of loss after taxation |  | (1.6) | (1.4) |  |  |
Total investment in joint venture |  | $ 144.4 | $ 82.1 |  |  |
Interest on joint venture |  | 40.00% | 40.00% | 40.00% |  |
Asanko Gold [member] |  |  |  |  |  |
Disclosure of equity-accounted investees [line items] |  |  |  |  |  |
Share of accumulated losses brought forward |  | $ 3.0 | $ (1.1) |  |  |
Total investment in joint venture |  | 88.9 | $ 89.9 |  |  |
Property, plant and equipment |  | 39.6 |  |  |  |
Asanko Gold [member] | Impairment Trigger During 2020 [member] |  |  |  |  |  |
Disclosure of equity-accounted investees [line items] |  |  |  |  |  |
Impairment loss recognised in Join venture |  | $ 49.5 |  |  |  |
Marverix Metals Incorporated [member] |  |  |  |  |  |
Disclosure of equity-accounted investees [line items] |  |  |  |  |  |
Common Shares |  |  |  |  | 42,850,000 |
Common shares |  | 4,125,000 | 4,125,000 |  | 10,000,000 |
Common shares issued |  |  |  | 60,000,000 |  |
Common shares purchase warrants |  |  |  | 10,000,000 |  |
Interest on listed entity |  | 0.00% | 0.00% |  |  |
Profit on disposal |  |  | $ 14.6 | $ 4.0 | $ 48.0 |
Listed shares at cost |  | $ 0.0 | 42.1 |  |  |
Profit on dilution of Gold Fields' interest in Maverix |  | 0.0 | 4.0 |  |  |
Transaction costs capitalised |  | 0.0 | 0.3 |  |  |
Share of accumulated profits brought forward |  | 0.0 | 1.2 |  |  |
Share of profit after taxation |  | 0.0 | 0.4 |  |  |
Derecognition of associate |  | 0.0 | (48.0) |  |  |
Investment in associate |  | $ 0.0 | $ 0.0 |  |  |
Marverix Metals Incorporated [member] | Top of range [member] |  |  |  |  |  |
Disclosure of equity-accounted investees [line items] |  |  |  |  |  |
Interest on listed entity |  |  |  | 28.00% |  |
Marverix Metals Incorporated [member] | Bottom of range [member] |  |  |  |  |  |
Disclosure of equity-accounted investees [line items] |  |  |  |  |  |
Interest on listed entity |  |  |  | 20.00% |  |
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 |  |  |

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