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Equity-Accounted Investees - Summary of Equity-Accounted Investees (Parenthetical) (Detail) - USD ($) shares in Thousands, $ in Millions |  |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 23, 2016 | Mar. 31, 2012 | Dec. 31, 2010 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | [1] | Dec. 31, 2011 | Dec. 31, 2010
Disclosure of equity-accounted investees [Line Items] |  |  |  |  |  |  |  |  |
Interest on unlisted entity |  |  |  | 50.00% |  |  |  |  |
Profit on disposal |  |  |  | $ 4.0 | $ 48.0 | [1] | $ (0.1) |  |
Investment in associates - Other |  |  |  | $ 42.7 | $ 42.1 |  |  |  |
Far Southeast Gold Resources Incorporated [Member] |  |  |  |  |  |  |  |  |
Disclosure of equity-accounted investees [Line Items] |  |  |  |  |  |  |  |  |
Interest on unlisted entity |  |  |  | 40.00% | 40.00% |  |  |  |
Option to acquire |  | 40.00% | 60.00% |  |  |  |  |  |
Non-refundable down payment |  | $ 110.0 | $ 44.0 |  |  |  |  | $ 66.0 |
Percentage of ownership |  | 20.00% |  |  |  |  |  |  |
Unlisted shares at cost |  |  |  | $ 230.0 | $ 230.0 |  |  |  |
Equity contribution |  |  |  | 79.3 | 77.7 |  |  |  |
Cumulative impairment |  |  |  | (101.4) | (101.4) |  |  |  |
Share of accumulated losses brought forward |  |  |  | (77.7) | (75.4) |  |  |  |
Share of loss after taxation |  |  |  | (1.6) | (2.3) |  |  |  |
Total investment in joint venture |  |  |  | $ 128.6 | $ 128.6 |  |  |  |
Option remains exercisable |  |  |  | 20.00% |  |  |  |  |
Option to acquire shares |  |  |  | 20.00% |  |  |  |  |
Marverix Metals Incorporated [Member] |  |  |  |  |  |  |  |  |
Disclosure of equity-accounted investees [Line Items] |  |  |  |  |  |  |  |  |
Interest on listed entity |  |  |  | 28.00% | 32.00% |  |  |  |
Common Shares | 42,850 |  |  |  |  |  |  |  |
Common shares | $ 10.0 |  |  |  |  |  |  |  |
Profit on disposal | $ 48.0 |  |  |  |  |  |  |  |
Listed shares at cost |  |  |  | $ 42.1 | $ 42.1 |  |  |  |
Transaction costs capitalised |  |  |  | 0.3 | 0.0 |  |  |  |
Share of profit after taxation |  |  |  | 0.3 | 0.0 |  |  |  |
Investment in associates - Other |  |  |  | 42.7 | 42.1 |  |  |  |
Fair value of investment |  |  |  | 57.2 | 42.1 |  |  |  |
Other [Member] |  |  |  |  |  |  |  |  |
Disclosure of equity-accounted investees [Line Items] |  |  |  |  |  |  |  |  |
Investment in associates - Other |  |  |  | 0.0 | 0.0 |  |  |  |
Bezant Resources PLC [Member] |  |  |  |  |  |  |  |  |
Disclosure of equity-accounted investees [Line Items] |  |  |  |  |  |  |  |  |
Investment in associates - Other |  |  |  | $ 0.0 | $ 0.0 |  |  |  |
Bezant Resources PLC [Member] | Top of range [member] |  |  |  |  |  |  |  |  |
Disclosure of equity-accounted investees [Line Items] |  |  |  |  |  |  |  |  |
Holdings diluted percentage |  |  |  |  | 21.60% |  |  |  |
Bezant Resources PLC [Member] | Bottom of range [member] |  |  |  |  |  |  |  |  |
Disclosure of equity-accounted investees [Line Items] |  |  |  |  |  |  |  |  |
Holdings diluted percentage |  |  |  |  | 8.80% |  |  |  |
Rusoro Mining Limited [Member] |  |  |  |  |  |  |  |  |
Disclosure of equity-accounted investees [Line Items] |  |  |  |  |  |  |  |  |
Interest on listed entity |  |  |  | 25.70% |  |  |  |  |
Investment in associates - Other |  |  |  | $ 0.0 | $ 0.0 |  |  |  |
Lepanto Consolidated Mining Company [Member] |  |  |  |  |  |  |  |  |
Disclosure of equity-accounted investees [Line Items] |  |  |  |  |  |  |  |  |
Option fees |  |  |  |  |  |  |  |  | $ 10.0
Percentage of remaining shares |  | 60.00% |  |  |  |  |  |  |
[1] | As Restated - Refer note 40 for further details.

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