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Earnings Per Share - Details of Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Earnings per share [line items] |  |  |
Basic earnings/(loss) per share | $ 0.82 | $ 0.20 | $ (0.42)
Diluted basic earnings/(loss) per share | $ 0.81 | $ 0.19 | $ (0.42)
Net profit/(loss) attributable to owners of the parent has been adjusted by the following to arrive at the diluted profit/(loss) attributable to owners of the parent: |  |  |
Profit/(loss) attributable to owners of the parent | $ 723.0 | $ 161.6 | $ (348.2)
South Deep minority interest at 10% | (3.7) | 0.0 | 0.0
Diluted profit/(loss) attributable to owners of the parent | $ 719.3 | $ 161.6 | $ (348.2)
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 ordinary shares | 878,661,474 | 827,386,603 | 821,532,707
Share options in issue | 11,180,243 | 11,847,499 | 10,932,784
Diluted weighted average number of ordinary shares | 889,841,717 | 839,234,102 | 832,465,491
Headline earnings/(loss) per share | $ 0.83 | $ 0.20 | $ 0.07
Long-form headline earnings reconciliation |  |  |
Profit/(Loss) attributable to owners of the parent from continuing operations | $ 723.0 | $ 161.6 | $ (348.2)
Loss/(profit) on disposal of assets, net | 0.1 | (0.8) | 37.0
Gross | 0.2 | (1.2) | 51.6
Taxation effect | (0.1) | 0.4 | (12.0)
Non-controlling interest effect | 0.0 | 0.0 | (2.6)
Impairment, reversal of impairment and write-off of investments and assets and other, net | 6.2 | 1.9 | 371.8
Impairment, net of reversal of impairment of investments and assets | (50.6) | 9.8 | 520.3
Write-off of exploration and evaluation assets | 16.9 | 30.0 | 37.7
Gold Fields' share of Asanko Gold mine impairment | 49.5 | 0.0 | 0.0
Profit on disposal of Maverix (2018: profit on dilution of Gold Fields' interest in Maverix) | 0.0 | (33.8) | (4.0)
Gain on acquisition of Asanko | 0.0 | 0.0 | (51.8)
Release of foreign exchange reserve on disposal of subsidiary | 0.0 | 4.6 | 0.0
Loss on disposal of subsidiary | 0.0 | 0.3 | 0.0
Taxation effect | (8.9) | (9.0) | (130.4)
Non-controlling interest effect | (0.7) | 0.0 | 0.0
Headline earnings | $ 729.3 | $ 162.7 | $ 60.6
Diluted headline earnings/(loss) per share | $ 0.82 | $ 0.19 | $ 0.07
Headline earnings has been adjusted by the following to arrive at dilutive headline earnings: |  |  |
Headline earnings | $ 729.3 | $ 162.7 | $ 60.6
South Deep non-controlling interest at 10% | (3.7) | 0.0 | 0.0
Diluted headline earnings | $ 725.6 | $ 162.7 | $ 60.6

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