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Dividends - Summary of Dividends (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | [1] | Dec. 31, 2015 | [1]
Disclosure of Dividends [Line Items] |  |  |
Dividends recognised as distribution to owners | $ 62.8 | $ 39.2 | $ 15.1
Dividends per share | $ 0.08 | $ 0.05 | $ 0.02
Final Dividend [Member] |  |  |
Disclosure of Dividends [Line Items] |  |  |
Dividends recognised as distribution to owners | $ 37.5 | $ 10.6 | $ 12.8
Interim Dividend [Member] |  |  |
Disclosure of Dividends [Line Items] |  |  |
Dividends recognised as distribution to owners | $ 25.3 | $ 28.6 | $ 2.3
[1] | As Restated - Refer note 40 for further details.

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