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Earnings Per Share - Details of Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | [1] | Dec. 31, 2015 | [1]
Earnings per share [abstract] |  |  |
Basic earnings/(loss) per share from continuing operations | $ (0.04) | $ 0.19 | $ (0.31)
Basic earnings/(loss) per share from discontinued operation | 0.02 | 0.00 | (0.01)
Diluted basic earnings/(loss) per share from continuing operations | $ (0.04) | $ 0.19 | $ (0.31)
The weighted average number of shares has been adjusted by the following to arrive at the diluted number of ordinary shares: |  |  |
Weighted average number of shares | 820,611,806 | 809,889,990 | 774,763,151
Share options in issue | 6,308,615 | 192,201 |
Diluted number of ordinary shares | 826,920,421 | 810,082,191 | 774,763,151
Diluted basic earnings/(loss) per share from discontinued operation | $ 0.02 | $ 0.00 | $ (0.01)
Headline earnings/(loss) per share from continuing operations | $ 0.26 | $ 0.24 | $ (0.05)
Long-form headline earnings/(loss) reconciliation |  |  |
(Loss)/profit attributable to owners of the parent from continuing operations | $ (31.8) | $ 157.0 | $ (239.1)
Profit on disposal of investments, net | 0.0 | (2.3) | (0.1)
Profit on disposal of investments | 0.0 | (2.3) | (0.1)
Taxation effect | 0.0 | 0.0 | 0.0
(Profit)/loss on disposal of assets, net | (2.6) | (41.0) | 0.5
(Profit)/loss on disposal of assets | (4.0) | (48.0) | 0.1
Taxation effect | 1.2 | 7.0 | 0.2
Non-controlling interest effect | 0.2 | 0.0 | 0.2
Impairment, reversal of impairment and write-off of investments and assets and other, net | 246.7 | 84.6 | 202.3
Impairment, net of reversal of impairment of investments and assets | 200.2 | 76.5 | 198.9
Write-off of exploration and evaluation assets | 51.5 | 41.4 | 29.1
Taxation effect | (4.3) | (32.1) | (23.4)
Non-controlling interest effect | (0.7) | (1.2) | (2.3)
Headline earnings/(loss) from continuing operations | $ 212.3 | $ 198.3 | $ (36.4)
Headline earnings/(loss) per share from discontinued operation | $ 0.00 | $ 0.01 | $ 0.00
Profit/(loss) attributable to owners of the parent from discontinued operations | $ 13.1 | $ 1.2 | $ (8.2)
Impairment and write-off of investments and assets and other, net | (15.5) | 4.3 | 11.2
Impairment of assets | 0.0 | 0.0 | 14.2
Gain on sale of discontinued operation | (23.5) | 0.0 | 0.0
Write-off of exploration and evaluation assets | 1.5 | 6.1 | 1.7
Taxation effect | 6.5 | (1.8) | (4.7)
Headline (loss)/earnings from discontinuing operations | $ (2.4) | $ 5.5 | $ 3.0
Diluted headline earnings/(loss) per share from continuing operations | $ 0.26 | $ 0.24 | $ (0.05)
Diluted headline (loss)/earnings per share from discontinued operations | $ 0.00 | $ 0.01 | $ 0.00
[1] | As Restated - Refer note 40 for further details.

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