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Investment Income - Schedule of Investment Income (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018		Dec. 31, 2017
Disclosure of Investment Income [abstract]
Dividends received	$ 0.0	$ 0.4		$ 0.0
Interest received - environmental trust funds	0.7	0.6	[1]	0.5	[1]
Interest received - cash balances	6.6	6.8		5.1
Total investment income	$ 7.3	$ 7.8		$ 5.6
[1] Refer note 42.

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- Definition

Disclosure of Investment Income [abstract].

+ References

No definition available.

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- 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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- 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 2019-01-01
-Paragraph 112
-Subparagraph c
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- Definition

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

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 26
-IssueDate 2019-01-01
-Paragraph 35
-Subparagraph b
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2019-01-01
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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.

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-Name IAS
-Number 1
-IssueDate 2019-01-01
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