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Dividends - Summary of Dividends (Detail) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) $ / shares | Dec. 31, 2018 R / shares | Dec. 31, 2017 USD ($) $ / shares | Dec. 31, 2017 R / shares | Dec. 31, 2016 USD ($) $ / shares | Dec. 31, 2016 R / shares | Dec. 31, 2015 R / shares
Disclosure of Dividends [line items] |  |  |  |  |  |  |
Total dividends | $ 45.5 |  | $ 62.8 |  | $ 39.2 |  |
Dividends per share - cents | $ / shares | $ 0.06 |  | $ 0.08 |  | $ 0.05 |  |
Final Dividend [Member] |  |  |  |  |  |  |
Disclosure of Dividends [line items] |  |  |  |  |  |  |
Dividends recognised as distribution to owners | $ 34.7 |  | $ 37.5 |  | $ 10.6 |  |
Dividends per share - cents | R / shares |  |  |  | R 0.50 |  | R 0.60 | R 0.21
Interim Dividend [Member] |  |  |  |  |  |  |
Disclosure of Dividends [line items] |  |  |  |  |  |  |
Dividends recognised as distribution to owners | $ 10.8 |  | $ 25.3 |  | $ 28.6 |  |
Dividends per share - cents | R / shares |  | R 0.20 |  | R 0.40 |  | R 0.50 |

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- Definition The amount of dividends relating to the current year, recognised as distributions to owners of the parent. [Refer: Parent [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_106_d&doctype=Standard -URIDate 2018-03-16 + Details
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