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Investment Income - Schedule of Investment Income (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	[1]	Dec. 31, 2015	[1]
Disclosure of Investment Income [abstract]
Interest received - environmental trust funds	$ 0.5	$ 1.0		$ 0.4
Interest received - cash balances	5.1	7.3		5.9
Total investment income	$ 5.6	$ 8.3		$ 6.3
[1] As Restated - Refer note 40 for further details.

X

- Definition

Disclosure of Investment Income [abstract].

+ References

No definition available.

+ Details

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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.

+ Details

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X

- 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 2017-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard
-URIDate 2017-03-09

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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 2017-01-01
-Paragraph 35
-Subparagraph b
-Clause iii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=26&date=2017-03-01&anchor=para_35_b_iii&doctype=Standard
-URIDate 2017-03-09

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 85
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_85&doctype=Standard
-URIDate 2017-03-09

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