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Investment Income - Schedule of Investment Income (Detail) - USD ($) $ in Millions | 12 Months Ended
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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.

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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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- 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 + Details
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