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Change in Working Capital - Summary of Change in Working Capital (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure Change In Working Capital [abstract]
Inventories	[1]	$ (56.2)	$ 0.8	$ (55.1)
Trade and other receivables	[1]	(5.6)	(0.5)	(19.6)
Trade and other payables	[1]	37.2	(32.2)	(15.2)
Total change in working capital	[1]	$ (24.6)	$ (31.9)	$ (89.9)
[1] Refer note 42.

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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 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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