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Change in Working Capital - Summary of Change in Working Capital (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	[1]	Dec. 31, 2015	[1]
Disclosure Change In Working Capital [Abstract]
Inventories	$ (55.1)	$ (39.2)		$ 47.5
Trade and other receivables	(2.2)	2.8		36.5
Trade and other payables	(12.1)	34.1		(40.7)
Total change in working capital	$ (69.4)	$ (2.3)		$ 43.3
[1] The restatement is as a result of the discontinued operations.

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Disclosure Change In Working Capital Abstract.

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Adjustments for decrease (increase) in inventories to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Inventories; Profit (loss)]

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Adjustments for decrease (increase) in trade and other receivables to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Trade and other receivables; Profit (loss)]

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Adjustments for increase (decrease) in trade and other payables to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Trade and other payables; Profit (loss)]

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The increase (decrease) in working capital.

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