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Earnings Per Share - Details of Earnings Per Share (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
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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.

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- Definition Headline Earnings per share [abstract] + References No definition available. + Details
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- Definition The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2017-01-01 -Paragraph 70 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=33&date=2017-03-01&anchor=para_70_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The profit (loss) from continuing operations attributable to ordinary equity holders of the parent equity. [Refer: Continuing operations [member]; Profit (loss) from continuing operations] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2017-01-01 -Paragraph 70 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=33&date=2017-03-01&anchor=para_70_a&doctype=Standard -URIDate 2017-03-09 + Details
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