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Deferred Taxation - Schedule of Detailed Components of Net Deferred Taxation Liability (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | [1] | Dec. 31, 2015
Liabilities |  |  |  |
Liabilities | $ 1,051.3 | $ 986.3 |  |
Assets |  |  |  |
Assets | (669.4) | (576.4) |  |
Net deferred taxation liabilities | 381.9 | 409.9 |  |
Included in the statement of financial position as follows: |  |  |  |
Deferred taxation assets | (72.0) | (48.7) | $ (54.1) |
Deferred taxation liabilities | 453.9 | 458.6 | $ 482.2 | [1]
Balance at end of the year | 381.9 | 409.9 |  |
Balance at beginning of the year | 409.9 | 428.1 |  |
Recognised in profit or loss - continuing operations | (31.5) | (14.7) |  |
Recognised in profit or loss - discontinued operations | 3.4 | 0.1 |  |
Translation adjustment | 0.1 | (3.6) |  |
Balance at end of the year | 381.9 | 409.9 |  |
Mining Assets [member] |  |  |  |
Liabilities |  |  |  |
Liabilities | 1,014.1 | 966.3 |  |
Environmental Trust Funds [member] |  |  |  |
Liabilities |  |  |  |
Liabilities | 3.4 | 2.8 |  |
Inventories [member] |  |  |  |
Liabilities |  |  |  |
Liabilities | 12.1 | 13.7 |  |
Unremitted earnings [member] |  |  |  |
Liabilities |  |  |  |
Liabilities | 9.1 | 0.0 |  |
Other [member] |  |  |  |
Liabilities |  |  |  |
Liabilities | 12.6 | 3.5 |  |
Provisions [member] |  |  |  |
Assets |  |  |  |
Assets | (108.4) | (100.8) |  |
Tax Losses [member] |  |  |  |
Assets |  |  |  |
Assets | (69.1) | (54.7) |  |
Unredeemed Capital Expenditure [member] |  |  |  |
Assets |  |  |  |
Assets | $ (491.9) | $ (420.9) |  |
[1] | As Restated - Refer note 40 for further details.

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