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Investment Income-Schedule of Investment Income (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Analysis of income and expense [abstract]
Dividends received	$ 0.1	$ 0.4	$ 0.0
Interest received – environmental trust funds	0.8	0.7	0.7
Interest received – cash balances	7.4	7.6	6.6
Total investment income	$ 8.3	$ 8.7	$ 7.3

X

- Definition

The amount of interest earned on funds intended to fund environmental rehabilitation obligations of the entity.

+ References

No definition available.

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- References

No definition available.

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- Definition

The amount of interest income on cash and cash equivalents. [Refer: Interest income; Cash and cash equivalents]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2021-01-01
-Paragraph 112
-Subparagraph c
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- Definition

The amount of investment income, such as interest and dividends.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 26
-IssueDate 2021-01-01
-Paragraph 35
-Subparagraph b
-Clause iii
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2021-01-01
-Paragraph 85
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_85&doctype=Standard
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- Definition

The amount of dividends recognised as income. Dividends are distributions of profits to holders of equity investments in proportion to their holdings of a particular class of capital.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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-IssueDate 2021-01-01
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