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Investments - Summary of Investments (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Listed
At fair value through OCI (2017: available for sale financial assets)	$ 93.0	$ 99.0
Unlisted
Asanko redeemable preference shares	132.9	0.0
Other	0.1	0.1
Derivative instruments
Warrants	9.3	5.5
Total investments	235.3	$ 104.6
Fair value at acquisition	129.9
Net change in fair value (recognised in OCI)	3.0
Fair value at end of the year	132.9
Par value of the preference shares	$ 165.0
Market-related interest rate	7.85%
Expected redemption period	5 years

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Expected redemption period.

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- Definition

Investment fair value.

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- Definition

Market related interest rate.

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- Definition

Noncurrent financial assets at cost.

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- Definition

Par value of the preference shares.

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- Definition

Unlisted other financial assets.

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- Definition

Unlisted redeemable preference shares.

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- Definition

Unlisted redeemable preference shares fair value at acquisition.

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Unlisted redeemable preference shares net change in fair value.

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- Definition

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

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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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