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Borrowings - Schedule of Borrowings (Detail) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of detailed information about borrowings [line items] |  |  |
Total borrowings | $ 2,011.6 | $ 1,781.5 |
Current borrowings | (86.3) | (193.6) |
Non-current borrowings | 1,925.3 | 1,587.9 |
US $1 Billion Notes [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total borrowings | $ 849.4 | 847.9 | $ 846.4
Name of borrower | Orogen |  |
Commitment fee | 0.00% |  |
Maturity date | 7 October 2020 |  |
US$150 million revolving senior secured credit facility - old [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total borrowings | $ 0.0 | 0.0 |
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 - new [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total borrowings | $ 83.5 | 83.5 | 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$70 million revolving senior secured credit facility [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total borrowings | $ 0.0 | 0.0 | 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$100 million revolving senior secured credit facility [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total borrowings | $ 45.0 | 45.0 | 0.0
Name of borrower | Ghana |  |
Commitment fee | 1.40% |  |
Maturity date | 30 November 2021 |  |
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 3.50 |  |
A$500 million syndicated revolving credit facility [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total borrowings | $ 316.5 | 231.5 |
Name of borrower | Gruyere |  |
Commitment fee | 0.94% |  |
Maturity date | 24 May 2021 |  |
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 |  |
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 2020 |  |
Facility A (US $380 Million) [member] | Fixed Interest Rate [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Nominal interest rate | LIBOR plus 2.25 |  |
Facility B (US $360 Million) [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total borrowings | $ 203.0 | 0.0 |
Name of borrower | Orogen |  |
Commitment fee | 0.77% |  |
Maturity date | 6 June 2021 |  |
Facility B (US $360 Million) [member] | Fixed Interest Rate [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Nominal interest rate | LIBOR plus 1.95 |  |
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 2.20 |  |
R 1,500 Million Nedbank Revolving Credit Facility [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total borrowings | $ 0.0 | 79.5 | 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 - new [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total borrowings | $ 0.0 | 0.0 |
Name of borrower | GFIJVH/GFO |  |
Commitment fee | 0.90% |  |
Maturity date | 8 May 2023 |  |
R 1,500 million Nedbank revolving credit facility - new [member] | Fixed Interest Rate [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Nominal interest rate | JIBAR plus 2.80 |  |
R 500 million Standard Bank revolving credit facility [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total borrowings | $ 13.7 | 0.0 |
Name of borrower | GFIJVH/GFO |  |
Commitment fee | 1.05% |  |
Maturity date | 31 March 2020 |  |
R 500 million Standard Bank revolving credit facility [member] | Fixed Interest Rate [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Nominal interest rate | JIBAR plus 2.75 |  |
R 500 million Absa Bank revolving credit facility [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total borrowings | $ 34.2 | 0.0 |
Name of borrower | GFIJVH/GFO |  |
Commitment fee | 0.893% |  |
Maturity date | 31 March 2020 |  |
R 500 million Absa Bank revolving credit facility [member] | Fixed Interest Rate [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Nominal interest rate | JIBAR plus 2.55 |  |
Short-term Rand Uncommitted Credit Facilities [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total borrowings | $ 86.3 | 114.1 | 61.0
Commitment fee | 0.00% |  |
US$1,290 Million Term Loan and Revolving Credit Facilities [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total borrowings | $ 583.0 | $ 380.0 | $ 658.5

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