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Revenue - Schedule of Revenue (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure Of Revenues [Abstract] |  |  |  |  |
Revenue from mining operations | $ 2,761.8 | $ 2,666.4 | [1] | $ 2,454.1 | [1]
[1] | As Restated - Refer note 40 for further details.

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