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Changes in Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2018
Text block [abstract] |
Summary of impact, net of tax, of transition to IFRS 15 on retained earnings on 1 January 2018 |
|  | United States Dollar |
Figures in millions unless otherwise stated |  | Impact of adopting IFRS 15 at 1 January 2018 |
Retained earnings |  |  |  |
Revenue |  |  | (15.0 | )
Cost of sales |  |  | 11.5 |
Impact at 1 January 2018 |  |  | (3.5 | )
Summary of Impact on Consolidated Income Statement and Statement of Other Comprehensive Income and Cash flow Statement |
|  | United States Dollar |
Figures in millions unless otherwise stated |  | As reported |  |  | 2018 Adjustment |  |  | Amounts without adoption of IFRS 15 |
Revenue |  |  | 2,577.8 |  |  |  | (15.0) |  |  |  | 2,562.8 |
Cost of sales |  |  | (2,043.0 | ) |  |  | 11.5 |  |  |  | (2,031.5 | )
Others |  |  | (879.6 | ) |  |  | — |  |  |  | (879.6 | )
(Loss)/profit for the year |  |  | (344.8 | ) |  |  | (3.5) |  |  |  | (348.3 | )
Other comprehensive income, net of tax |  |  | (330.0 | ) |  |  | — |  |  |  | (330.0 | )
Total comprehensive income for the year |  |  | (674.8 | ) |  |  | (3.5) |  |  |  | (678.3 | )
|  | United States Dollar |
Figures in millions unless otherwise stated |  | As reported |  |  | 2018 Adjustment |  |  | Amounts without adoption of IFRS 15 |
Cash flows from operating activities |  |  |  |  |  |  |  |  |  |  |  |
Cash generated by operations |  |  | 998.0 |  |  |  | (3.5 | ) |  |  | 994.5 |
Change in working capital |  |  | (16.3 | ) |  |  | 3.5 |  |  |  | (12.8 | )
Others |  |  | (423.9 | ) |  |  | — |  |  |  | (423.9 | )
|  |  | 557.8 |  |  |  | — |  |  |  | 557.8 |
Summary of Impact of Transition to IFRS 9 on the Classification of Financial Assets |
|  |  |  |  |  |  |  |  |  |  | United States Dollar |
Figures in millions unless otherwise stated |  | Note |  |  | Original classification under IAS 39 |  |  | New classification under IFRS 9 |  |  | Carrying amount under IAS 39 |  |  | Carrying amount under IFRS 9 |
Environmental trust funds |  |  | 37 |  |  |  | FVTPL |  |  |  | FVTPL |  |  |  | 7.3 |  |  |  | 7.3 |
Environmental trust funds |  |  | 37 |  |  |  | Loans and receivables |  |  |  | Amortised cost |  |  |  | 48.2 |  |  |  | 48.2 |
Trade and other receivables |  |  | 37 |  |  |  | Loans and receivables |  |  |  | Amortised cost |  |  |  | 45.3 |  |  |  | 45.3 |
Cash and cash equivalents |  |  | 37 |  |  |  | Loans and receivables |  |  |  | Amortised cost |  |  |  | 479.0 |  |  |  | 479.0 |
Trade receivables from provisional copper and gold concentrate sales |  |  | 37 |  |  |  | FVTPL |  |  |  | FVTPL |  |  |  | 21.2 |  |  |  | 21.2 |
Investments¹ |  |  | 37 |  |  |  | Available for sale |  |  |  | FVOCI |  |  |  | 99.1 |  |  |  | 99.1 |
Warrants |  |  | 37 |  |  |  | Derivative instruments |  |  |  | FVTPL |  |  |  | 5.5 |  |  |  | 5.5 |
Gold and oil derivative contracts |  |  | 37 |  |  |  | Derivative instruments |  |  |  | FVTPL |  |  |  | 25.0 |  |  |  | 25.0 |
Total financial assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 730.6 |  |  |  | 730.6 |
¹   As permitted by IFRS 9, the Group has designated these investments at the date of initial application at FVOCI. Unlike IAS 39, the accumulated fair value reserve related to these investments will never be reclassified to profit or loss.
Summary of Impact of Transition to IFRS 9 on the Classification of Financial Liabilities |
|  |  |  |  |  |  |  |  |  |  | United States Dollar |
Figures in millions unless otherwise stated |  | Note |  |  | Original classification under IAS 39 |  |  | New classification under IFRS 9 |  |  | Carrying amount under IAS 39 |  |  | Carrying amount under IFRS 9 |
Borrowings |  |  | 37 |  |  |  | Other financial liabilities |  |  |  | Other financial liabilities |  |  |  | 1,781.5 |  |  |  | 1,781.5 |
Trade and other payables |  |  | 37 |  |  |  | Other financial liabilities |  |  |  | Other financial liabilities |  |  |  | 451.0 |  |  |  | 451.0 |
Copper derivative contracts |  |  | 37 |  |  |  | FVTPL |  |  |  | FVTPL |  |  |  | 3.3 |  |  |  | 3.3 |
Total financial liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,235.8 |  |  |  | 2,235.8 |

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