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Earnings Per Share - Details of Earnings Per Share (Parenthetical) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Basic earnings per share      
Earnings attributable to owners of the parent from continuing operations $ 161.6 $ (348.2) $ (31.8)
Weighted average number of shares issued continuing operations 827,386,603 821,532,707 820,611,806
Profit from discontinued operations, net of taxation $ 0.0 $ 0.0 $ 13.1
Weighted average number of ordinary shares in issue during period from discontinued operation 827,386,603 821,532,707 820,611,806
Diluted earnings per share      
Profit/(loss) from continuing operations $ 161.6 $ (348.2) $ (31.8)
Diluted weighted average number of shares issued continuing operations 839,234,102 832,465,491 826,920,421
Diluted profit from discontinued operations, net of taxation $ 0.0 $ 0.0 $ 13.1
Diluted weighted average number of ordinary shares in issue during period from discontinued operation 839,234,102 832,465,491 826,920,421
Headline earnings per share      
Headline weighted average number of ordinary shares, continuing operation 827,386,603 821,532,707 820,611,806
Headline weighted average number of ordinary shares, discontinuing operation 827,386,603 821,532,707 820,611,806
Headline earnings $ 162.7 $ 60.6 $ 212.3
Adjusted net earnings attributable to owners of the parent, discontinued operations 0.0 0.0 (2.4)
Diluted headline earnings per share      
Diluted Headline earnings $ 162.7 $ 60.6 $ 212.3
Diluted headline weighted average number of ordinary shares, continuing operation 839,234,102 832,465,491 826,920,421
Diluted headline weighted average number of ordinary shares, discontinuing operation 839,234,102 832,465,491 826,920,421
Adjusted net earnings attributable to owners of the parent, diluted discontinued operations $ 0.0 $ 0.0 $ (2.4)