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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) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Trade and other payables | $ 393.1 | $ 451.0 |
Gold, copper and foreign exchange derivative contracts | 22.6 | 3.3 | $ 0.0
Environmental rehabilitation costs5 | 399.9 | 381.0 |
Finance lease liabilities | 111.5 |  |
South Deep dividend | 9.6 | 12.7 |
Total | 3,131.9 | 2,817.3 |
US dollar borrowings [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Capital | 1,563.9 | 1,360.9 |
Interest | 134.6 | 149.1 |
Australian Dollar borrowings [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Capital | 316.5 | 231.5 |
Interest | 33.2 | 23.4 |
Rand borrowing [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Capital | 134.2 | 193.6 |
Interest | 12.8 | 10.8 |
Within one year [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Trade and other payables | 393.1 | 451.0 |
Gold, copper and foreign exchange derivative contracts | 22.6 | 3.3 |
Environmental rehabilitation costs5 | 13.0 | 6.5 |
Finance lease liabilities | 11.6 |  |
South Deep dividend | 1.4 | 1.6 |
Total | 627.6 | 737.6 |
Within one year [member] | US dollar borrowings [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Capital | 0.0 | 0.0 |
Interest | 74.2 | 61.3 |
Within one year [member] | Australian Dollar borrowings [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Capital | 0.0 | 0.0 |
Interest | 13.8 | 9.5 |
Within one year [member] | Rand borrowing [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Capital | 86.3 | 193.6 |
Interest | 11.6 | 10.8 |
Later than one and not later than five years [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Trade and other payables | 0.0 | 0.0 |
Gold, copper and foreign exchange derivative contracts | 0.0 | 0.0 |
Environmental rehabilitation costs5 | 33.7 | 24.8 |
Finance lease liabilities | 41.5 |  |
South Deep dividend | 4.1 | 5.3 |
Total | 2,088.6 | 1,724.2 |
Later than one and not later than five years [member] | US dollar borrowings [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Capital | 1,563.9 | 1,360.9 |
Interest | 60.4 | 87.8 |
Later than one and not later than five years [member] | Australian Dollar borrowings [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Capital | 316.5 | 231.5 |
Interest | 19.4 | 13.9 |
Later than one and not later than five years [member] | Rand borrowing [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Capital | 47.9 | 0.0 |
Interest | 1.2 | 0.0 |
Later than five years [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Trade and other payables | 0.0 | 0.0 |
Gold, copper and foreign exchange derivative contracts | 0.0 | 0.0 |
Environmental rehabilitation costs5 | 353.2 | 349.7 |
Finance lease liabilities | 58.4 |  |
South Deep dividend | 4.1 | 5.8 |
Total | 415.7 | 355.5 |
Later than five years [member] | US dollar borrowings [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Capital | 0.0 | 0.0 |
Interest | 0.0 | 0.0 |
Later than five years [member] | Australian Dollar borrowings [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Capital | 0.0 | 0.0 |
Interest | 0.0 | 0.0 |
Later than five years [member] | Rand borrowing [member] |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |  |
Capital | 0.0 | 0.0 |
Interest | $ 0.0 | $ 0.0 |

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