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Estimated Capital Allowances (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014
Operating Loss Carryforwards [Line Items] |  |  |
Calculated tax losses |  | $ 652.3 | $ 739.1
Abosso Goldfields Limited |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Maximum number of years losses can be carried forward |  | 5 years |
Calculated tax losses | [1] | $ 65.7 | 46.5
Exploration Entities |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Calculated tax losses | [2] | 345.2 | 387.9
Tax losses without expiration |  | 188.2 | 224.6
Expire Between One and Two Years | Exploration Entities |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax losses with expiration |  | 3.8 | 12.1
Expire Between Two and Five Years | Exploration Entities |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax losses with expiration |  | 62.9 | 67.1
Expire Between Five and Ten Years | Exploration Entities |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax losses with expiration |  | 49.6 | 62.5
Expire After 10 Years | Exploration Entities |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax losses with expiration |  | $ 40.7 | $ 21.6
[1] | Tax losses may be carried forward for five years. These losses expire on a first-in-first-out basis.
[2] | The tax losses of $345.2 million (2014: $387.9 million) comprise $3.8 million (2014: $12.1 million) of tax losses that expire between one and two years, $62.9 million (2014: $67.1 million) of tax losses that expire between two and five years, $49.6 million (2014: $62.5 million) of tax losses that expire between five and ten years, $40.7 million (2014: $21.6 million) of tax losses that expire after 10 years and $188.2 million (2014: $224.6 million) of tax losses that have no expiry date.

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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