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Share-Based Payments - Summary of Options - Narrative (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure of terms and conditions of share-based payment arrangement [line items]
Weighted average share price on the JSE (in USD per share)	$ 9.71	$ 9.25	$ 4.82
Compensation costs related to awards not yet recognised	$ 14.7	$ 19.7	$ 17.5
Share based compensation recognition period	3 years
Ordinary Shares
Disclosure of terms and conditions of share-based payment arrangement [line items]
Unexercised options and shares, percent	0.60%
Top of range | Ordinary Shares
Disclosure of terms and conditions of share-based payment arrangement [line items]
Maximum number of ordinary shares that can be issued (in shares)	44,385,867
Maximum number of shares that can be issued to an individual (in shares)	4,438,587

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- Definition

Compensation costs related to awards not yet recognised.

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- Definition

Maximum number of shares that can be issued to an individual under sharebased payment arrangements

+ References

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- Definition

Maximum number of shares that can be issued under sharebased payment arrangements.

+ References

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- Definition

Percentage of unexercised options and shares.

+ References

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- Definition

Unrecognized Share-based Payments Compensation Cost Recognised Period

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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- Definition

The weighted average share price. [Refer: Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2021-01-01
-Paragraph 45
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_c&doctype=Standard
-URIDate 2021-03-24

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