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Capital Management (Tables) | 12 Months Ended
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Dec. 31, 2017
Text block1 [abstract] |
Summary of Reconciliation of Net Operating Profit |
|  |  |  |  | UNITED STATES DOLLAR |
|  | Notes |  |  | 2017 |  |  | 2016 |
Borrowings |  |  |  |  |  |  | 1,781.5 |  |  |  | 1,692.9 |
Less: Cash and cash equivalents |  |  |  |  |  |  | 479.0 |  |  |  | 526.7 |
Net debt |  |  |  |  |  |  | 1,302.5 |  |  |  | 1,166.2 |
Adjusted EBITDA |  |  |  |  |  |  | 1,263.7 |  |  |  | 1,232.2 |
Net debt to adjusted EBITDA |  |  |  |  |  |  | 1.03 |  |  |  | 0.95 |
Reconciliation of (loss)/profit for the year to adjusted EBITDA: |  |  |  |  |  |  |  |  |  |  |  |
(Loss)/profit for the year (continuing and discontinued operations) |  |  |  |  |  |  | (7.7 | ) |  |  | 169.1 |
Mining and income taxation from continuing operations |  |  |  |  |  |  | 173.2 |  |  |  | 189.5 |
Mining and income taxation from discontinued operations |  |  | 12.1 |  |  |  | (1.4 | ) |  |  | 0.6 |
Royalties from continuing operations |  |  |  |  |  |  | 62.0 |  |  |  | 78.4 |
Royalties from discontinued operations |  |  | 12.1 |  |  |  | 1.1 |  |  |  | 2.0 |
Finance expense from continuing operations |  |  |  |  |  |  | 81.3 |  |  |  | 78.1 |
Investment income from continuing operations |  |  |  |  |  |  | (5.6 | ) |  |  | (8.3 | )
Gain on financial instruments from continuing operations |  |  |  |  |  |  | (34.4 | ) |  |  | (14.4 | )
Foreign exchange loss from continuing operations |  |  |  |  |  |  | 3.5 |  |  |  | 6.4 |
Amortisation and depreciation from continuing operations |  |  | 2 |  |  |  | 748.1 |  |  |  | 671.4 |
Amortisation and depreciation from discontinued operations |  |  | 2 |  |  |  | 3.5 |  |  |  | 14.4 |
Share-based payments from continuing operations |  |  |  |  |  |  | 26.8 |  |  |  | 14.0 |
Long-term incentive plan from continuing operations |  |  |  |  |  |  | 5.0 |  |  |  | 10.5 |
Restructuring costs from continuing operations |  |  |  |  |  |  | 9.2 |  |  |  | 11.7 |
Silicosis settlement costs from continuing operations |  |  |  |  |  |  | 30.2 |  |  |  | — |
Impairment, net of reversal of impairment of investments and assets from continuing operations |  |  |  |  |  |  | 200.2 |  |  |  | 76.5 |
Profit on disposal of investments from continuing operations |  |  |  |  |  |  | — |  |  |  | (2.3 | )
Profit on disposal of assets from continuing operations |  |  |  |  |  |  | (4.0 | ) |  |  | (48.0 | )
Gain on sale of discontinued operation, net of taxation |  |  | 12.1 |  |  |  | (16.4 | ) |  |  | — |
Share of results of equity-accounted investees, net of taxation |  |  |  |  |  |  | 1.3 |  |  |  | 2.3 |
Rehabilitation income from continuing operations |  |  | 7 |  |  |  | (13.5 | ) |  |  | (9.7 | )
Profit on buy-back of notes |  |  | 7 |  |  |  | — |  |  |  | (17.7 | )
Other |  |  |  |  |  |  | 1.3 |  |  |  | 7.7 |
|  |  |  |  |  |  | 1,263.7 |  |  |  | 1,232.2 |

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