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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).