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Borrowings - Schedule of Borrowings (Detail) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total borrowings | $ 1,781.5 | $ 1,692.9 |  |
Current borrowings | (193.6) | (188.0) | [1] |
Non-current borrowings | 1,587.9 | 1,504.9 | [1] |
US$70 million revolving senior secured credit facility [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total borrowings | $ 0.0 | 45.0 |  | $ 45.0
Name of borrower | Ghana |  |  |
Commitment fee | 1.00% |  |  |
Maturity date | 6 May 2017 |  |  |
US$70 million revolving senior secured credit facility [member] | Fixed Interest Rate [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Nominal interest rate | LIBOR plus 2.40 |  |  |
US$70 million revolving senior secured credit facility [member] | Floating Interest Rate [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Nominal interest rate | 2.40% |  |  |
US$100 million revolving senior secured credit facility [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total borrowings | $ 45.0 | 0.0 |  | 0.0
Name of borrower | Ghana |  |  |
Commitment fee | 1.20% |  |  |
Maturity date | 21 June 2020 |  |  |
US$100 million revolving senior secured credit facility [member] | Fixed Interest Rate [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Nominal interest rate | LIBOR plus 2.95 |  |  |
US$100 million revolving senior secured credit facility [member] | Floating Interest Rate [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Nominal interest rate | 2.95% |  |  |
US $1 Billion Notes [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total borrowings | $ 847.9 | 846.4 |  | 992.6
Name of borrower | Orogen |  |  |
Commitment fee | 0.00% |  |  |
Maturity date | 7 October 2020 |  |  |
US $1 Billion Notes [member] | Floating Interest Rate [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Nominal interest rate | 4.875% |  |  |
US$150 million revolving senior secured credit facility - old [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total borrowings | $ 0.0 | 82.0 |  |
Name of borrower | La Cima |  |  |
Commitment fee | 0.65% |  |  |
Maturity date | 19 December 2017 |  |  |
US$150 million revolving senior secured credit facility - old [member] | Fixed Interest Rate [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Nominal interest rate | LIBOR plus 1.63 |  |  |
US$150 million revolving senior secured credit facility - old [member] | Floating Interest Rate [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Nominal interest rate | 1.63% |  |  |
US$150 million revolving senior secured credit facility - new [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total borrowings | $ 83.5 | 0.0 |  | 0.0
Name of borrower | La Cima |  |  |
Commitment fee | 0.50% |  |  |
Maturity date | 19 September 2020 |  |  |
US$150 million revolving senior secured credit facility - new [member] | Fixed Interest Rate [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Nominal interest rate | LIBOR plus 1.20 |  |  |
US$150 million revolving senior secured credit facility - new [member] | Floating Interest Rate [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Nominal interest rate | 1.20% |  |  |
A$500 million syndicated revolving credit facility [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total borrowings | $ 231.5 | 0.0 |  |
Name of borrower | Gruyere |  |  |
Commitment fee | 0.94% |  |  |
Maturity date | 24 May 2020 |  |  |
A$500 million syndicated revolving credit facility [member] | Fixed Interest Rate [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Nominal interest rate | BBSY plus 2.35 |  |  |
A$500 million syndicated revolving credit facility [member] | Floating Interest Rate [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Nominal interest rate | 2.35% |  |  |
Facility A (US $75 Million) [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total borrowings | $ 0.0 | 0.0 |  |
Name of borrower | Orogen |  |  |
Commitment fee | 0.00% |  |  |
Maturity date | 28 November 2015 |  |  |
Facility A (US $75 Million) [member] | Fixed Interest Rate [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Nominal interest rate | LIBOR plus 2.45 |  |  |
Facility A (US $75 Million) [member] | Floating Interest Rate [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Nominal interest rate | 2.45% |  |  |
Facility A (US $45 Million) [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total borrowings | $ 0.0 | 0.0 |  |
Name of borrower | Orogen |  |  |
Commitment fee | 0.00% |  |  |
Maturity date | - |  |  |
Facility A (US $45 Million) [member] | Fixed Interest Rate [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Nominal interest rate | LIBOR plus 2.45 |  |  |
Facility A (US $45 Million) [member] | Floating Interest Rate [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Nominal interest rate | 2.45% |  |  |
Facility B (US $720 Million) [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total borrowings | $ 0.0 | 0.0 |  |
Name of borrower | Orogen |  |  |
Commitment fee | 0.90% |  |  |
Maturity date | - |  |  |
Facility B (US $720 Million) [member] | Fixed Interest Rate [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Nominal interest rate | LIBOR plus 2.25 |  |  |
Facility B (US $720 Million) [member] | Floating Interest Rate [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Nominal interest rate | 2.25% |  |  |
Facility C (US $670 Million) [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total borrowings | $ 0.0 | 0.0 |  |
Name of borrower | Orogen |  |  |
Commitment fee | 0.80% |  |  |
Maturity date | - |  |  |
Facility C (US $670 Million) [member] | Fixed Interest Rate [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Nominal interest rate | LIBOR plus 2.00 |  |  |
Facility C (US $670 Million) [member] | Floating Interest Rate [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Nominal interest rate | 2.00% |  |  |
Facility A (US $380 Million) [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total borrowings | $ 380.0 | 380.0 |  |
Name of borrower | Orogen |  |  |
Commitment fee | 0.00% |  |  |
Maturity date | 6 June 2019 |  |  |
Facility A (US $380 Million) [member] | Fixed Interest Rate [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Nominal interest rate | LIBOR plus 2.50 |  |  |
Facility A (US $380 Million) [member] | Floating Interest Rate [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Nominal interest rate | 2.50% |  |  |
Facility B (US $360 Million) [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total borrowings | $ 0.0 | 278.5 |  |
Name of borrower | Orogen |  |  |
Commitment fee | 0.77% |  |  |
Maturity date | 6 June 2020 |  |  |
Facility B (US $360 Million) [member] | Fixed Interest Rate [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Nominal interest rate | LIBOR plus 2.20 |  |  |
Facility B (US $360 Million) [member] | Floating Interest Rate [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Nominal interest rate | 2.20% |  |  |
Facility C (US $550 Million) [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total borrowings | $ 0.0 | 0.0 |  |
Name of borrower | Orogen |  |  |
Commitment fee | 0.86% |  |  |
Maturity date | 6 June 2021 |  |  |
Facility C (US $550 Million) [member] | Fixed Interest Rate [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Nominal interest rate | LIBOR plus 2.45 |  |  |
Facility C (US $550 Million) [member] | Floating Interest Rate [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Nominal interest rate | 2.45% |  |  |
R 1,500 Million Nedbank Revolving Credit Facility [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total borrowings | $ 79.5 | 0.0 |  | 0.0
Name of borrower | GFIJVH/GFO |  |  |
Commitment fee | 0.85% |  |  |
Maturity date | 7 March 2018 |  |  |
R 1,500 Million Nedbank Revolving Credit Facility [member] | Fixed Interest Rate [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Nominal interest rate | JIBAR plus 2.50 |  |  |
R 1,500 Million Nedbank Revolving Credit Facility [member] | Floating Interest Rate [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Nominal interest rate | 2.50% |  |  |
Short-term Rand Uncommitted Credit Facilities [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total borrowings | $ 114.1 | 61.0 |  | $ 16.7
Commitment fee | 0.00% |  |  |
Maturity date | - |  |  |
US$1,510 Million Term Loan and Revolving Credit Facilities [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total borrowings | $ 0.0 | 0.0 |  |
US$1,290 Million Term Loan and Revolving Credit Facilities [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total borrowings | $ 380.0 | $ 658.5 |  |
[1] | As Restated - Refer note 40 for further details.

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