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Goodwill - Changes in Goodwill (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Reconciliation of changes in goodwill [abstract]
Balance at beginning of the year	$ 0.0	[1]	$ 76.6
Impairment	0.0		(71.7)		$ (277.8)
Translation adjustment	0.0		(4.9)
Balance at end of the year	$ 0.0		$ 0.0	[1]	$ 76.6
[1] Refer note 42.

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]]

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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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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]

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