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Correction of Methodology - Summary of Consolidated Statement of Comprehensive Income (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Profit/(loss) for the year |  | $ (7.7) | $ 169.1 | [1] | $ (247.8) | [1]
Others comprehensive income, net of tax | [2],[3] | 279.2 | 121.4 | [1] | (635.5) | [1]
Foreign currency translation adjustments |  | 279.9 | 129.7 | [1] | (635.9) | [1]
Others |  | (0.7) | (8.3) | [1] | 0.4 | [1]
Total comprehensive income for the year |  | 271.5 | 290.5 | [1] | (883.3) | [1]
Attributable to: |  |  |  |  |  |
Owners of the parent |  | 260.5 | 279.6 | [1] | (882.8) | [1]
Non controlling interest holders |  | 11.0 | 10.9 | [1] | (0.5) | [1]
Total comprehensive income for the year |  | $ 271.5 | 290.5 | [1] | (883.3) | [1]
Previously Stated [member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Profit/(loss) for the year |  |  | 173.7 |  | (242.6) |
Others comprehensive income, net of tax |  |  | 121.4 |  | (636.6) |
Foreign currency translation adjustments |  |  | 129.7 |  | (637.0) |
Others |  |  | (8.3) |  | 0.4 |
Total comprehensive income for the year |  |  | 295.1 |  | (879.2) |
Attributable to: |  |  |  |  |  |
Owners of the parent |  |  | 284.2 |  | (878.7) |
Non controlling interest holders |  |  | 10.9 |  | (0.5) |
Total comprehensive income for the year |  |  | 295.1 |  | (879.2) |
Adjustments [Member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Profit/(loss) for the year |  |  | (4.6) |  | (5.2) |
Others comprehensive income, net of tax |  |  | 0.0 |  | 1.1 |
Foreign currency translation adjustments |  |  | 0.0 |  | 1.1 |
Others |  |  | 0.0 |  | 0.0 |
Total comprehensive income for the year |  |  | (4.6) |  | (4.1) |
Attributable to: |  |  |  |  |  |
Owners of the parent |  |  | (4.6) |  | (4.1) |
Non controlling interest holders |  |  | 0.0 |  | 0.0 |
Total comprehensive income for the year |  |  | (4.6) |  | (4.1) |
As Restated Before Reclassification of Discontinued Operation [member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Profit/(loss) for the year |  |  | 169.1 |  | (247.8) |
Others comprehensive income, net of tax |  |  | 121.4 |  | (635.5) |
Foreign currency translation adjustments |  |  | 129.7 |  | (635.9) |
Others |  |  | (8.3) |  | 0.4 |
Total comprehensive income for the year |  |  | 290.5 |  | (883.3) |
Attributable to: |  |  |  |  |  |
Owners of the parent |  |  | 279.6 |  | (882.8) |
Non controlling interest holders |  |  | 10.9 |  | (0.5) |
Total comprehensive income for the year |  |  | 290.5 |  | (883.3) |
Discontinued operation reclassification [member] |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |
Profit/(loss) for the year |  |  | 0.0 |  | 0.0 |
Others comprehensive income, net of tax |  |  | 0.0 |  | 0.0 |
Foreign currency translation adjustments |  |  | 0.0 |  | 0.0 |
Others |  |  | 0.0 |  | 0.0 |
Total comprehensive income for the year |  |  | 0.0 |  | 0.0 |
Attributable to: |  |  |  |  |  |
Owners of the parent |  |  | 0.0 |  | 0.0 |
Non controlling interest holders |  |  | 0.0 |  | 0.0 |
Total comprehensive income for the year |  |  | $ 0.0 |  | $ 0.0 |
[1] | As Restated - Refer note 40 for further details.
[2] | All items can be subsequently reclassified to the income statement.
[3] | Includes deferred tax of US$nil (2016: US$nil and 2015: US$nil).

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