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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, 2017 | Dec. 31, 2016
--- | --- | ---
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Trade and other payables | $ 451.0 | $ 459.3
Environmental rehabilitation costs | 381.0 | 380.8
Total | 2,817.3 | 2,766.6
Copper derivatives [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Copper derivative contracts | 3.3 |
South deep [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
South Deep dividend | 12.7 | 12.8
US dollar borrowings [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Capital | 1,360.9 | 1,637.9
Interest | 149.1 | 209.7
Australian Dollar borrowings [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Capital | 231.5 |
Interest | 23.4 |
Rand borrowing [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Capital | 193.6 | 61.0
Interest | 10.8 | 5.1
Within one year [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Trade and other payables | 451.0 | 459.3
Environmental rehabilitation costs | 6.5 | 3.6
Total | 737.6 | 722.0
Within one year [member] | Copper derivatives [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Copper derivative contracts | 3.3 |
Within one year [member] | South deep [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
South Deep dividend | 1.6 | 1.4
Within one year [member] | US dollar borrowings [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Capital | 0.0 | 127.0
Interest | 61.3 | 64.6
Within one year [member] | Australian Dollar borrowings [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Capital | 0.0 |
Interest | 9.5 |
Within one year [member] | Rand borrowing [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Capital | 193.6 | 61.0
Interest | 10.8 | 5.1
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
Environmental rehabilitation costs | 24.8 | 29.8
Total | 1,724.2 | 1,691.0
Later than one and not later than five years [member] | Copper derivatives [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Copper derivative contracts | 0.0 |
Later than one and not later than five years [member] | South deep [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
South Deep dividend | 5.3 | 5.2
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 | 1,360.9 | 1,510.9
Interest | 87.8 | 145.1
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 | 231.5 |
Interest | 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 | 0.0 | 0.0
Interest | 0.0 | 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
Environmental rehabilitation costs | 349.7 | 347.4
Total | 355.5 | 353.6
Later than five years [member] | Copper derivatives [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
Copper derivative contracts | 0.0 |
Later than five years [member] | South deep [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [line items] |  |
South Deep dividend | 5.8 | 6.2
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 |
Interest | 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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