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Investments - Summary of Investments (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2020
Listed
At fair value through OCI	$ 47.9	$ 42.4
Unlisted
Asanko redeemable preference shares	95.5	92.6
Derivative instruments
Warrants	11.7	12.9
Total investments	155.1	147.9
Fair value at beginning of the year	132.9	95.5
Purchase of preference shares	20.0
Redemption of preference shares	(10.0)	(37.5)
Net change in fair value (recognised in OCI)	(47.4)	34.6
Fair value at end of the year	$ 95.5	$ 92.6

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- Definition

Derivative instruments abstract

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- Definition

Investment fair value.

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- Definition

Noncurrent financial assets at cost.

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- Definition

Redemption of Preferrence Shares

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- Definition

Unlisted redeemable preference shares.

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No definition available.

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- Definition

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- Definition

Unlisted redeemable preference shares fair value at acquisition.

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- Definition

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]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard
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- Definition

The increase in the fair value measurement of the entity's own equity instruments resulting from purchases of those equity instruments. [Refer: At fair value [member]; Entity's own equity instruments [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2020-01-01
-Paragraph 93
-Subparagraph e
-Clause iii
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