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Correction of Methodology - Summary of Consolidated Income Statement (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Revenue |  | $ 2,761.8 | $ 2,666.4 | [1] | $ 2,454.1 | [1]
Cost of sales |  | (2,105.1) | (2,001.2) | [1] | (1,988.5) | [1]
Others | [1] |  | (307.8) |  | (456.7) |
Profit before taxation |  | 152.4 | 357.4 | [1] | 8.9 | [1]
Mining and income taxation |  | (173.2) | (189.5) | [1] | (248.5) | [1]
Profit/(loss) from continuing operations |  | (20.8) | 167.9 | [1] | (239.6) | [1]
Profit/(loss) from discontinued operations, net of taxation |  | 13.1 | 1.2 | [1] | (8.2) | [1]
Profit/(loss) for the year |  | (7.7) | 169.1 | [1] | (247.8) | [1]
Profit/(loss) attributable to: |  |  |  |  |  |
Owners of the parent |  | (18.7) | 158.2 | [1] | (247.3) | [1]
Non controlling interest holders |  | 11.0 | 10.9 | [1] | (0.5) | [1]
Profit/(loss) |  | $ (7.7) | $ 169.1 | [1] | $ (247.8) | [1]
Earnings/loss per share attributable to owners of the parent: |  |  |  |  |  |
Basic earnings/(loss) per share from continuing operations - cents |  | $ (0.04) | $ 0.19 | [1] | $ (0.31) | [1]
Diluted earnings/(loss) per share from continuing operations - cents |  | $ (0.04) | $ 0.19 | [1] | $ (0.31) | [1]
Previously Stated [member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Revenue |  |  | $ 2,749.5 |  | $ 2,545.4 |
Cost of sales |  |  | (2,066.7) |  | (2,066.1) |
Others |  |  | (317.0) |  | (474.8) |
Profit before taxation |  |  | 365.8 |  | 4.5 |
Mining and income taxation |  |  | (192.1) |  | (247.1) |
Profit/(loss) from continuing operations |  |  | 173.7 |  | (242.6) |
Profit/(loss) from discontinued operations, net of taxation |  |  | 0.0 |  | 0.0 |
Profit/(loss) for the year |  |  | 173.7 |  | (242.6) |
Profit/(loss) attributable to: |  |  |  |  |  |
Owners of the parent |  |  | 162.8 |  | (242.1) |
Non controlling interest holders |  |  | 10.9 |  | (0.5) |
Profit/(loss) |  |  | $ 173.7 |  | $ (242.6) |
Earnings/loss per share attributable to owners of the parent: |  |  |  |  |  |
Basic earnings/(loss) per share from continuing operations - cents |  |  | $ 0.20 |  | $ (0.31) |
Diluted earnings/(loss) per share from continuing operations - cents |  |  | $ 0.20 |  | $ (0.31) |
Adjustments [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Revenue |  |  | $ 0.0 |  | $ 0.0 |
Cost of sales |  |  | (6.6) |  | (7.4) |
Others |  |  | 0.0 |  |  |
Profit before taxation |  |  | (6.6) |  | (7.4) |
Mining and income taxation |  |  | 2.0 |  | 2.2 |
Profit/(loss) from continuing operations |  |  | (4.6) |  | (5.2) |
Profit/(loss) from discontinued operations, net of taxation |  |  | 0.0 |  | 0.0 |
Profit/(loss) for the year |  |  | (4.6) |  | (5.2) |
Profit/(loss) attributable to: |  |  |  |  |  |
Owners of the parent |  |  | (4.6) |  | (5.2) |
Non controlling interest holders |  |  | 0.0 |  | 0.0 |
Profit/(loss) |  |  | $ (4.6) |  | $ (5.2) |
Earnings/loss per share attributable to owners of the parent: |  |  |  |  |  |
Basic earnings/(loss) per share from continuing operations - cents |  |  | $ (0.01) |  | $ (0.01) |
Diluted earnings/(loss) per share from continuing operations - cents |  |  | $ (0.01) |  | $ (0.01) |
As Restated Before Reclassification of Discontinued Operation [member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Revenue |  |  | $ 2,749.5 |  | $ 2,545.4 |
Cost of sales |  |  | (2,073.3) |  | (2,073.5) |
Others |  |  | (317.0) |  | (474.8) |
Profit before taxation |  |  | 359.2 |  | (2.9) |
Mining and income taxation |  |  | (190.1) |  | (244.9) |
Profit/(loss) from continuing operations |  |  | 169.1 |  | (247.8) |
Profit/(loss) from discontinued operations, net of taxation |  |  | 0.0 |  | 0.0 |
Profit/(loss) for the year |  |  | 169.1 |  | (247.8) |
Profit/(loss) attributable to: |  |  |  |  |  |
Owners of the parent |  |  | 158.2 |  | (247.3) |
Non controlling interest holders |  |  | 10.9 |  | (0.5) |
Profit/(loss) |  |  | $ 169.1 |  | $ (247.8) |
Earnings/loss per share attributable to owners of the parent: |  |  |  |  |  |
Basic earnings/(loss) per share from continuing operations - cents |  |  | $ 0.19 |  | $ (0.32) |
Diluted earnings/(loss) per share from continuing operations - cents |  |  | $ 0.19 |  | $ (0.32) |
Discontinued operation reclassification [member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Revenue |  |  | $ (83.1) |  | $ (91.3) |
Cost of sales |  |  | 72.1 |  | 85.0 |
Others |  |  | 9.2 |  | 18.1 |
Profit before taxation |  |  | (1.8) |  | 11.8 |
Mining and income taxation |  |  | 0.6 |  | (3.6) |
Profit/(loss) from continuing operations |  |  | (1.2) |  | 8.2 |
Profit/(loss) from discontinued operations, net of taxation |  |  | 1.2 |  | (8.2) |
Profit/(loss) for the year |  |  | 0.0 |  | 0.0 |
Profit/(loss) attributable to: |  |  |  |  |  |
Owners of the parent |  |  | 0.0 |  | 0.0 |
Non controlling interest holders |  |  | 0.0 |  | 0.0 |
Profit/(loss) |  |  | $ 0.0 |  | $ 0.0 |
Earnings/loss per share attributable to owners of the parent: |  |  |  |  |  |
Basic earnings/(loss) per share from continuing operations - cents |  |  | $ 0.00 |  | $ 0.01 |
Diluted earnings/(loss) per share from continuing operations - cents |  |  | $ 0.00 |  | $ 0.01 |
[1] | As Restated - Refer note 40 for further details.

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