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Borrowings - Schedule of Borrowings (Parenthetical) (Detail) R in Millions, $ in Millions, $ in Millions |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 09, 2019 USD ($) | May 27, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2020 ZAR (R) | Dec. 31, 2020 AUD ($) | Nov. 23, 2020 AUD ($) | Nov. 19, 2020 AUD ($) | Jul. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jul. 25, 2019 USD ($) | Jun. 30, 2019 USD ($) | May 24, 2019 | Dec. 31, 2018 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of borrowings |  |  | $ 1,200.0 |  |  |  |  |  |  |  |  |  |  |
Term loan and revolving credit facility |  |  |  |  |  |  |  |  |  |  | $ 1,290.0 |  |  |
Outstanding Notes |  |  | 1,526.9 |  |  |  |  |  |  | $ 1,845.8 |  |  |  |
Total proceeds from issue of notes and debentures | $ 1,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Average borrowings interest rate | 5.625% |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of borrowings |  |  |  |  |  |  |  |  |  |  | 1,290.0 |  |  |
Term loan and revolving credit facility |  |  |  |  |  |  |  |  |  |  | 1,200.0 |  |  |
Revolving Credit Facility [member] | Gold Fields Ghana Holdings [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facilities |  |  |  |  |  |  |  |  |  |  | 1,200.0 |  |  |
US $1 Billion Notes [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of borrowings |  |  | 1,000.0 |  |  |  |  |  |  | 1,000.0 |  |  |  |
Purchase of notes, amount |  |  | $ 147.6 |  |  |  |  |  |  |  |  |  |  |
Purchase price per US$1,000 |  |  |  |  |  |  |  |  |  | 880.0 |  |  |  |
Borrowing financed, description |  |  | the purchase of an aggregate principal amount of notes equal to US$147.6 million at the purchase price of US$880 per US$1,000 in principal amount of notes. GFA held the notes until their maturity on 7 October 2020. The group recognised a profit of US$17.7 million in 2016 on the buy back of the 2020 notes. |  |  |  |  |  |  |  |  |  |  |
Profit (loss) on buy back of notes |  | $ (5.0) |  | $ 17.7 |  |  |  |  |  |  |  |  |  |
Outstanding Notes |  | $ 250.0 | $ 0.0 |  |  |  |  |  |  | 601.4 |  |  |  |
Percentage At Shares Repurchased |  | 102.00% |  |  |  |  |  |  |  |  |  |  | 101.73% |
Notes Maturity |  |  | 7 October 2020 |  |  |  |  |  |  |  |  |  |  |
US$500 million 5-year notes issue (the 5-year notes) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of borrowings |  |  | $ 500.0 |  |  |  |  |  |  |  |  |  |  |
Unamortized transaction costs |  |  | 3.0 |  |  |  |  |  |  | 3.7 |  |  |  |
Interest Rate On Notes | 5.125% |  |  |  |  |  |  |  |  |  |  |  |  |
US$500 million 10-year notes issue (the 10-year notes) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of borrowings |  |  | 500.0 |  |  |  |  |  |  |  |  |  |  |
Unamortized transaction costs |  |  | 3.6 |  |  |  |  |  |  | 3.9 |  |  |  |
Interest Rate On Notes | 6.125% |  |  |  |  |  |  |  |  |  |  |  |  |
US$150 million revolving senior secured credit facility - New [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of borrowings |  |  | 150.0 |  |  |  |  |  |  |  |  |  |  |
US$100 million revolving credit facility [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of borrowings |  |  | 100.0 |  |  |  |  |  |  |  |  |  |  |
Outstanding Notes |  |  | $ 0.0 |  |  |  |  |  |  | 0.0 |  |  |  |
Notes Maturity |  |  | 30 November 2021 |  |  |  |  |  |  |  |  |  |  |
Facility A (US $380 Million) [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of borrowings |  |  | $ 380.0 |  |  |  |  |  |  |  |  |  |  |
Outstanding Notes |  |  | $ 0.0 |  |  |  |  |  |  | 0.0 |  |  |  |
Notes Maturity |  |  | 6 June 2020 |  |  |  |  |  |  |  |  |  |  |
Facility B (US $360 Million) [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of borrowings |  |  | $ 360.0 |  |  |  |  |  |  |  |  |  |  |
Outstanding Notes |  |  | $ 0.0 |  |  |  |  |  |  | 0.0 |  |  |  |
Notes Maturity |  |  | 6 June 2021 |  |  |  |  |  |  |  |  |  |  |
Facility C (US $550 Million) [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of borrowings |  |  | $ 550.0 |  |  |  |  |  |  |  |  |  |  |
Outstanding Notes |  |  | $ 0.0 |  |  |  |  |  |  | 0.0 |  |  |  |
Notes Maturity |  |  | 6 June 2021 |  |  |  |  |  |  |  |  |  |  |
US$1,200 million revolving credit facilities [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of borrowings |  |  |  |  |  |  |  |  |  | 1,200.0 |  |  |  |
Outstanding Notes |  |  | $ 250.0 |  |  |  |  |  |  | 0.0 |  |  |  |
US$1,200 million revolving credit facilities [member] | Revolving Credit Facility [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of borrowings |  |  |  |  |  |  |  |  | $ 870.0 |  |  |  |  |
Facility A (US$600 million 3-year revolving credit facility) [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of borrowings |  |  | 600.0 |  |  |  |  |  |  |  |  |  |  |
Outstanding Notes |  |  | $ 250.0 |  |  |  |  |  |  | 0.0 |  |  |  |
Notes Maturity |  |  | 25 July 2022 |  |  |  |  |  |  |  |  |  |  |
Facility B (US$600 million 5-year revolving credit facility) [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of borrowings |  |  | $ 600.0 |  |  |  |  |  |  |  |  |  |  |
Outstanding Notes |  |  | $ 0.0 |  |  |  |  |  |  | 0.0 |  |  |  |
Notes Maturity |  |  | 25 July 2024 |  |  |  |  |  |  |  |  |  |  |
R 1,500 Million Nedbank Revolving Credit Facility [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of borrowings | R |  |  |  |  | R 1,500 |  |  |  |  |  |  |  |  |
Outstanding Notes |  |  | $ 0.0 |  |  |  |  |  |  | 0.0 |  |  |  |
Notes Maturity |  |  | 8 May 2023 |  |  |  |  |  |  |  |  |  |  |
R 500 million Absa Bank revolving credit facility [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of borrowings | R |  |  |  |  | 500 |  |  |  |  |  |  |  |  |
Outstanding Notes |  |  | $ 0.0 |  |  |  |  |  |  | 0.0 |  |  |  |
Notes Maturity |  |  | 15 April 2023 |  |  |  |  |  |  |  |  |  |  |
US$1,290 million term loan and revolving credit facilities [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of borrowings | $ 1,290.0 |  |  |  |  |  |  |  |  |  |  | $ 1,290.0 |  |
Outstanding Notes |  |  | $ 0.0 |  |  |  |  |  |  | 0.0 |  |  |  | $ 472.0
3 year revolving credit facility [member] | Gold Fields Ghana Holdings [member] | Tranches One [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility Remaining Borrowings |  |  |  |  |  |  |  |  |  |  | 600.0 |  |  |
5 year revolving credit facilit [member] | Gold Fields Ghana Holdings [member] | Tranches Two [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility Current Borrowings |  |  |  |  |  |  |  |  |  |  | $ 600.0 |  |  |
Facility A: US$435 million revolving credit facility [member] | Bottom of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Maturity |  |  | 26 July 2022 |  |  |  |  |  |  |  |  |  |  |
Facility A: US$435 million revolving credit facility [member] | Top of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Maturity |  |  | 25 July 2023 |  |  |  |  |  |  |  |  |  |  |
Facility B: US$435 million revolving credit facility [member] | Amendment One [Member] | Bottom of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Maturity |  |  | 26 July 2024 |  |  |  |  |  |  |  |  |  |  |
Facility B: US$435 million revolving credit facility [member] | Amendment One [Member] | Top of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Maturity |  |  | 25 July 2025 |  |  |  |  |  |  |  |  |  |  |
Facility A: US$600 million revolving credit facility [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Maturity |  |  | 25 July 2022 |  |  |  |  |  |  |  |  |  |  |
Facility B: US$600 million revolving credit facility [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Maturity |  |  | 25 July 2024 |  |  |  |  |  |  |  |  |  |  |
AU $ 500 Million Syndicated Revolving Credit Facility Old [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of borrowings |  |  |  |  |  | $ 500 |  |  |  |  |  |  |  |
Outstanding Notes |  |  | $ 0.0 |  |  |  |  |  |  | 168.5 |  |  |  |
Notes Maturity |  |  | 24 May 2021 |  |  |  |  |  |  |  |  |  |  |
AU $ 500 Million Syndicated Revolving Credit Facility Old [Member] | Revolving Credit Facility [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of borrowings |  |  |  |  |  |  |  | $ 500 |  |  |  |  |  |
AU $ 500 Million Syndicated Revolving Credit Facility New [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of borrowings |  |  |  |  |  | $ 500 |  |  |  |  |  |  |  |
Outstanding Notes |  |  | $ 200.0 |  |  |  |  |  |  | 0.0 |  |  |  |
Notes Maturity |  |  | 19 November 2023 |  |  |  |  |  |  |  |  |  |  |
AU $ 500 Million Syndicated Revolving Credit Facility New [Member] | Revolving Credit Facility [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of borrowings |  |  |  |  |  |  | $ 500 |  |  |  |  |  |  |
R 500 Million Rand Merchant Bank Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of borrowings | R |  |  |  |  | R 500 |  |  |  |  |  |  |  |  |
Outstanding Notes |  |  | $ 0.0 |  |  |  |  |  |  | $ 0.0 |  |  |  |
Notes Maturity |  |  | 15 April 2023 |  |  |  |  |  |  |  |  |  |  |

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