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Borrowings - Schedule of Borrowings (Parenthetical) (Detail) R in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2018 ZAR (R)
Disclosure of detailed information about borrowings [line items] |  |  |  |
Face amount of borrowings | $ 1,290,000,000 |  |  |
Profit on buy back of notes | 0 | $ 0 | $ 17,700,000 |
Carrying value of asset | 4,259,200,000 | 4,892,900,000 |  |
Fleet assets and CIL plant [member] | Ghana [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Carrying value of asset |  | 183,600,000 |  |
US $1 Billion Notes [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Face amount of borrowings | 1,000,000,000 |  |  |
Unamortized transaction costs | 3,000,000 | 4,500,000 |  |
Profit on buy back of notes |  | $ 17,700,000 |  |
Term loan and revolving credit facility | 1,290,000,000 |  |  |
US$150 million revolving senior secured credit facility - old [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Face amount of borrowings | 150,000,000 |  |  |
US$150 million revolving senior secured credit facility - new [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Face amount of borrowings | 150,000,000 |  |  |
US$70 million revolving senior secured credit facility [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Face amount of borrowings | 70,000,000 |  |  |
Amount available under the facility | 70,000,000 |  |  |
US$100 million revolving senior secured credit facility [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Face amount of borrowings | 100,000,000 |  |  |
Amount available under the facility | 100,000,000 |  |  |
A$500 million syndicated revolving credit facility [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Face amount of borrowings | 500,000,000 |  |  |
Facility A (US $380 Million) [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Face amount of borrowings | 380,000,000 |  |  |
Facility B (US $360 Million) [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Face amount of borrowings | 360,000,000 |  |  |
Facility C (US $550 Million) [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Face amount of borrowings | 550,000,000 |  |  |
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
R 1,500 million Nedbank revolving credit facility - new [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Face amount of borrowings | R |  |  |  | 1,500
R 500 million Standard Bank revolving credit facility [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Face amount of borrowings | R |  |  |  | 500
R 500 million Absa Bank revolving credit facility [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Face amount of borrowings | R |  |  |  | R 500
US$1,290 Million Term Loan and Revolving Credit Facilities [Member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Face amount of borrowings | 1,290,000,000 |  |  |
US $147.6 Million Notes [Member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Face amount of borrowings | 1,510,000,000 |  |  |
Purchase of notes, amount | 147,600,000 |  |  |
Purchase price per US$1,000 | $ 880 |  |  |
Borrowing financed, description | The purchase of the notes amounting to US$147.6 million was financed by drawing down under the US$1,510 million term loan and revolving credit facilities (these facilities were cancelled and refinanced through the US$1,290 million term loan and revolving credit facility on 6 June 2017). The Group recognised a profit of US$17.7 million on the buy back of the notes. |  |  |

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