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Earnings Per Share - Details of Earnings Per Share (Detail) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
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.