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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Earnings per share [abstract] |  |  |
Basic earnings/(loss) per share from continuing operations | $ (0.42) | $ (0.04) | $ 0.19
Basic earnings/(loss) per share from discontinued operation | 0.00 | 0.02 | 0.00
Diluted basic earnings/(loss) per share from continuing operations | $ (0.42) | $ (0.04) | $ 0.19
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 | 821,532,707 | 820,611,806 | 809,889,990
Share options in issue | 10,932,784 | 6,308,615 | 192,201
Diluted number of ordinary shares | 832,465,491 | 826,920,421 | 810,082,191
Diluted basic earnings/(loss) per share from discontinued operation | $ 0.00 | $ 0.02 | $ 0.00
Headline earnings/(loss) per share from continuing operations | $ 0.07 | $ 0.26 | $ 0.24
Long-form headline earnings reconciliation |  |  |
(Loss)/profit attributable to owners of the parent from continuing operations | $ (348.2) | $ (31.8) | $ 157.0
Profit on disposal of investments, net | 0.0 | 0.0 | (2.3)
Gross | 0.0 | 0.0 | (2.3)
Taxation effect | 0.0 | 0.0 | 0.0
Loss/(profit) on disposal of assets, net | 37.0 | (2.6) | (41.0)
Gross | 51.6 | (4.0) | (48.0)
Taxation effect | (12.0) | 1.2 | 7.0
Non-controlling interest effect | (2.6) | 0.2 | 0.0
Impairment, reversal of impairment and write-off of investments and assets and other, net | 371.8 | 246.7 | 84.6
Impairment, net of reversal of impairment of investments and assets | 520.3 | 200.2 | 76.5
Write-off of exploration and evaluation assets | 37.7 | 51.5 | 41.4
Profit on dilution of Gold Fields' interest in Maverix | (4.0) | 0.0 | 0.0
Gain on acquisition of Asanko | (51.8) | 0.0 | 0.0
Taxation effect | (130.4) | (4.3) | (32.1)
Non-controlling interest effect | 0.0 | (0.7) | (1.2)
Headline earnings | 60.6 | 212.3 | $ 198.3
Headline earnings/(loss) per share from discontinued operation |  |  | $ 0.01
Profit attributable to owners of the parent from discontinued operations | 0.0 | 13.1 | $ 1.2
Impairment and write-off of investments and assets and other, net |  | (15.5) | 4.3
Gain on sale of discontinued operation |  | (23.5) |
Write-off of exploration and evaluation assets | $ 0.0 | 1.5 | 6.1
Taxation effect |  | 6.5 | (1.8)
Headline (loss)/earnings |  | $ (2.4) | $ 5.5
Diluted headline earnings/(loss) per share from continuing operations | $ 0.07 | $ 0.26 | $ 0.24
Diluted headline (loss)/earnings per share from discontinued operations |  |  | $ 0.01

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