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Goodwill - Changes in Goodwill (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Reconciliation of changes in goodwill [abstract]
Balance at beginning of the year	$ 317.8	[1]	$ 295.3
Impairment	(277.8)		0.0		$ 0.0
Translation adjustment	36.6		22.5
Balance at end of the year	$ 76.6		$ 317.8	[1]	$ 295.3
[1] As Restated - Refer note 40 for further details.

X

- Definition

The amount of assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Business combinations [member]]

+ References

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X

- Definition

The amount of impairment loss recognised in profit or loss for goodwill. [Refer: Impairment loss recognised in profit or loss; Goodwill]

+ References

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- Definition

The increase (decrease) in goodwill resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Goodwill]

+ References

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