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Risk Management Activities - Schedule of Contractually Due Undiscounted Cash Flows Resulting from Maturities of All Financial Liabilities, Including Interest Payments (Detail) $ in Millions, $ in Millions | Dec. 31, 2020 USD ($) | Dec. 31, 2020 AUD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 AUD ($) | Dec. 31, 2018 USD ($)
--- | --- | --- | --- | --- | ---
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items] |  |  |  |  |
Trade and other payables | $ 452.0 |  | $ 385.3 |  |
Oil and copper derivative contracts | 29.1 |  |  |  |
Gold and foreign exchange derivative contracts |  |  | 127.6 |  |
Environmental rehabilitation costs5 | 466.6 |  | 436.3 |  |
Finance lease liabilities | 429.0 |  | 332.9 |  | $ 88.6
South Deep dividend | 6.8 |  | 8.5 |  |
Total | 3,433.4 |  | 3,691.3 |  |
US dollar borrowings [member] |  |  |  |  |
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items] |  |  |  |  |
Capital | 1,333.5 |  | 1,685.9 |  |
Interest | 354.0 |  | 424.1 |  |
Australian Dollar borrowings [member] |  |  |  |  |
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items] |  |  |  |  |
Capital |  | $ 200.0 |  | $ 168.5 |
Interest |  | 13.1 |  | 7.7 |
Within one year [member] |  |  |  |  |
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items] |  |  |  |  |
Trade and other payables | 452.0 |  | 385.3 |  |
Oil and copper derivative contracts | 21.8 |  |  |  |
Gold and foreign exchange derivative contracts |  |  | 127.6 |  |
Environmental rehabilitation costs5 | 19.6 |  | 11.9 |  |
Finance lease liabilities | 88.4 |  | 63.9 |  |
South Deep dividend | 0.9 |  | 1.4 |  |
Total | 732.7 |  | 1,362.5 |  |
Within one year [member] | US dollar borrowings [member] |  |  |  |  |
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items] |  |  |  |  |
Capital | 83.5 |  | 685.9 |  |
Interest | 62.0 |  | 81.0 |  |
Within one year [member] | Australian Dollar borrowings [member] |  |  |  |  |
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items] |  |  |  |  |
Interest |  | 4.5 |  | 5.5 |
Later than one and not later than five years [member] |  |  |  |  |
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items] |  |  |  |  |
Oil and copper derivative contracts | 7.3 |  |  |  |
Environmental rehabilitation costs5 | 34.3 |  | 28.4 |  |
Finance lease liabilities | 228.7 |  | 178.2 |  |
South Deep dividend | 3.6 |  | 3.8 |  |
Total | 1,421.1 |  | 1,090.2 |  |
Later than one and not later than five years [member] | US dollar borrowings [member] |  |  |  |  |
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items] |  |  |  |  |
Capital | 750.0 |  | 500.0 |  |
Interest | 188.6 |  | 209.1 |  |
Later than one and not later than five years [member] | Australian Dollar borrowings [member] |  |  |  |  |
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items] |  |  |  |  |
Capital |  | 200.0 |  | 168.5 |
Interest |  | $ 8.6 |  | $ 2.2 |
Later than five years [member] |  |  |  |  |
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items] |  |  |  |  |
Environmental rehabilitation costs5 | 412.7 |  | 396.0 |  |
Finance lease liabilities | 261.2 |  | 205.3 |  |
South Deep dividend | 2.3 |  | 3.3 |  |
Total | 1,279.6 |  | 1,238.6 |  |
Later than five years [member] | US dollar borrowings [member] |  |  |  |  |
Disclosure of maturity analysis for derivative non-derivative financial liabilities [line items] |  |  |  |  |
Capital | 500.0 |  | 500.0 |  |
Interest | $ 103.4 |  | $ 134.0 |  |

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