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Earnings Per Share - Details of Earnings Per Share (Parenthetical) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
 [1]
Basic Earnings per share      
Earnings attributable to owners of the parent from continuing operations $ (31.8) $ 157.0 [1] $ (239.1)
Weighted average number of ordinary shares, basic 820,611,806 809,889,990 [1] 774,763,151
Earnings attributable to owners of the parent from discontinuing operations $ 13.1 $ 1.2 [1] $ (8.2)
Weighted average number of ordinary shares, basic 820,611,806 809,889,990 [1] 774,763,151
Diluted Basic Earnings per share      
Share options excluded from the dilutive number of ordinary shares [1]   1,804,321  
Headline Earnings per share      
Weighted average number of ordinary shares, basic 820,611,806 809,889,990 [1] 774,763,151
Adjusted net earnings attributable to owners of the parent, diluted $ 212.3 $ 198.3 [1] $ (36.4)
Adjusted net earnings attributable to owners of the parent, diluted discontinued operations $ 2.4 $ 5.5 [1] $ 3.0
Weighted average number of ordinary shares, diluted 826,920,421 810,082,191 [1] 774,763,151
[1] As Restated - Refer note 40 for further details.