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Investments - Summary of Investments (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Listed
Cost	$ 143.0	$ 62.9
Less: Accumulated impairments	(45.5)	(45.0)
Net unrealised loss on revaluation	(8.1)	(7.4)
Translation adjustment	9.6	0.0
Carrying value	99.0	10.5
Market value	99.0	10.5
Unlisted
Carrying value at cost	0.1	3.3
Derivative instruments
Total investments	104.6	19.7
Warrant [Member]
Derivative instruments
Warrants	$ 5.5	$ 5.9

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Carrying value noncurrent financial assets at cost.

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The amount of aggregate adjustments to the carrying amounts reported under previous GAAP of investments in subsidiaries, joint ventures or associates in the entity's first IFRS financial statements. [Refer: Associates [member]; Carrying amount [member]; Joint ventures [member]; Previous GAAP [member]; Subsidiaries [member]; Investments in subsidiaries, joint ventures and associates; IFRSs [member]]

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The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

+ References

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The gains (losses) recognised in other comprehensive income on the fair value measurement of assets. [Refer: At fair value [member]; Other comprehensive income]

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The amount of impairment loss recognised in other comprehensive income. Impairment loss on a revalued asset is recognised in other comprehensive income to the extent that the impairment loss does not exceed the amount in the revaluation surplus for that same asset. [Refer: Impairment loss; Revaluation surplus; Other comprehensive income]

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The amount of investments other than investments accounted for using the equity method. [Refer: Investments accounted for using equity method]

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The amount of non-current financial assets available-for-sale. [Refer: Financial assets available-for-sale; Non-current financial assets]

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