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Mining and Income Taxation - Summary of Components of Mining and Income Tax (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | [1] | Dec. 31, 2015 | [1]
Disclosure of Components of Mining and Income Tax [Line Items] |  |  |
Total mining and income taxation | $ (173.2) | $ (189.5) | $ (248.5)
Major items causing the Group's income taxation to differ from the maximum South African statutory mining tax rate of 34.0% (2016: 34.0% and 2015: 34.0%) were: |  |  |
Taxation on profit before taxation at maximum South African statutory mining tax rate | (51.8) | (121.5) | (3.0)
Rate adjustment to reflect the actual realised company tax rates in South Africa and offshore | 19.2 | 22.4 | 21.5
Non-deductible share-based payments | (9.1) | (4.8) | (3.6)
Non-deductible exploration expense | (19.7) | (15.2) | (7.7)
Deferred tax assets not recognised on impairment and reversal of impairment of investments | 13.3 | 0.0 | (53.2)
Impairment of South Deep goodwill | (94.5) | 0.0 | 0.0
Non-deductible interest paid | (24.2) | (24.2) | (26.9)
Non-taxable profit on disposal of investments | 0.0 | 0.8 | 0.0
Non-taxable profit on buy-back of notes | 0.0 | 6.0 | 0.0
Share of results of equity-accounted investees, net of taxation | (0.4) | (0.8) | (1.9)
Net non-deductible expenditure and non-taxable income | (5.3) | (9.7) | (8.5)
Deferred tax raised on unremitted earnings at Tarkwa | (9.5) | 0.0 | 0.0
Deferred taxation movement on Peruvian Nuevo Sol devaluation against US Dollar | 5.2 | (1.1) | (41.0)
Various Peruvian non-deductible expenses | (5.3) | (8.3) | (7.8)
Deferred tax assets not recognised at Cerro Corona and Damang | (12.9) | (34.9) | (112.5)
Utilisation of tax losses not previously recognised at Damang | 7.1 | 0.0 | 0.0
Deferred tax assets recognised at Cerro Corona and Damang | 19.8 | 0.0 | 0.0
Deferred tax release on change of tax rate (2016: Peruvian and Ghanaian operations and 2015: Peruvian operations) | 0.0 | 8.6 | 4.5
Prior year adjustments | (2.6) | (6.0) | (4.4)
Other | (2.5) | (0.8) | (4.0)
Total mining and income taxation | (173.2) | (189.5) | (248.5)
South African - Components of Mining and Income Tax [Member] |  |  |
Disclosure of Components of Mining and Income Tax [Line Items] |  |  |
- non-mining tax | (1.2) | (1.0) | 0.0
- company and capital gains taxation | (1.1) | (3.9) | (3.5)
- prior year adjustment - current taxation | 0.2 | 0.3 | 0.5
- deferred taxation | 12.1 | (9.5) | 17.1
Foreign Taxation - Components of Mining and Income Tax [Member] |  |  |
Disclosure of Components of Mining and Income Tax [Line Items] |  |  |
- prior year adjustment - current taxation | 2.8 | 6.3 |
- deferred taxation | 19.4 | 24.2 | (118.7)
- current taxation | (199.8) | (193.3) | (138.7)
- prior year adjustment - deferred taxation | $ 0.0 | $ 0.0 | $ (5.2)
[1] | As Restated - Refer note 40 for further details.

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