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Earnings Per Share - Details of Earnings Per Share (Detail) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Earnings per share [abstract]      
Basic earnings/(loss) per share from continuing operations $ 0.20 $ (0.42) $ (0.04)
Basic earnings/(loss) per share from discontinued operation 0.00 0.00 0.02
Diluted basic earnings/(loss) per share from continuing operations $ 0.19 $ (0.42) $ (0.04)
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 827,386,603 821,532,707 820,611,806
Share options in issue 11,847,499 10,932,784 6,308,615
Diluted number of ordinary shares 839,234,102 832,465,491 826,920,421
Diluted basic earnings/(loss) per share from discontinued operation $ 0.00 $ 0.00 $ 0.02
Headline earnings/(loss) per share from continuing operations $ 0.20 $ 0.07 $ 0.26
Long-form headline earnings reconciliation      
Profit/(Loss) attributable to owners of the parent from continuing operations $ 161.6 $ (348.2) $ (31.8)
Loss/(profit) on disposal of assets, net (0.8) 37.0 (2.6)
Gross (1.2) 51.6 (4.0)
Taxation effect 0.4 (12.0) 1.2
Non-controlling interest effect 0.0 (2.6) 0.2
Impairment, reversal of impairment and write-off of investments and assets and other, net 1.9 371.8 246.7
Impairment, net of reversal of impairment of investments and assets 9.8 520.3 200.2
Write-off of exploration and evaluation assets 30.0 37.7 [1] 51.5 [1]
Profit on disposal of Maverix (2018: profit on dilution of Gold Fields' interest in Maverix) (33.8) (4.0) 0.0
Gain on acquisition of Asanko 0.0 (51.8) [1] 0.0 [1]
Release of foreign exchange reserve on disposal of subsidiary 4.6 0.0 0.0
Loss on disposal of subsidiary 0.3 0.0 0.0
Taxation effect (9.0) (130.4) (4.3)
Non-controlling interest effect 0.0 0.0 (0.7)
Headline earnings $ 162.7 $ 60.6 $ 212.3
Headline earnings/(loss) per share from discontinued operation $ 0.00 $ 0.00 $ 0.00
Profit attributable to owners of the parent from discontinued operations $ 0.0 $ 0.0 $ 13.1
Impairment and write-off of investments and assets and other, net 0.0 0.0 (15.5)
Gain on sale of discontinued operation 0.0 0.0 (23.5)
Write-off of exploration and evaluation assets 0.0 0.0 1.5
Taxation effect 0.0 0.0 6.5
Headline (loss)/earnings $ 0.0 $ 0.0 $ (2.4)
Diluted headline earnings/(loss) per share from continuing operations $ 0.19 $ 0.07 $ 0.26
Diluted headline (loss)/earnings per share from discontinued operations $ 0.00 $ 0.00 $ 0.00
[1] Refer note 42.