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Cash Generated by Operations - Summary of Cash Generated by Operations (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash flows from (used in) operating activities [abstract] |  |  |  |
(Loss)/profit from continuing operations |  | $ (344.8) | $ (20.8) | $ 167.9
Mining and income taxation |  | (65.9) | 173.2 | 189.5
Royalties |  | 62.5 | 62.0 | 78.4
Interest expense |  | 91.8 | 91.2 | 82.5
Interest received |  | (6.8) | (5.1) | (7.3)
Amortisation and depreciation |  | 668.4 | 748.1 | 671.4
Interest expense - environmental rehabilitation |  | 11.7 | 12.1 | 10.7
Non-cash rehabilitation income |  | (0.9) | (13.5) | (9.7)
Interest received - environmental trust funds |  | (0.6) | (0.5) | (1.0)
Impairment, net of reversal of impairment of investments and assets |  | 520.3 | 200.2 | 76.5
Write-off of exploration and evaluation assets |  | 37.7 | 51.5 | 41.4
Loss/(profit) on disposal of assets |  | 51.6 | (4.0) | (48.0)
Profit on disposal of investments |  | 0.0 | 0.0 | (2.3)
Gain on acquisition of Asanko |  | (51.8) | 0.0 | 0.0
Unrealised loss/(gain) on derivative contracts2 |  | 36.6 | (20.7) | (14.4)
Fair value (gain)/loss on Maverix warrants2 |  | (3.8) | 0.4 | 0.0
Profit on dilution of Gold Fields' interest in Maverix |  | (4.0) | 0.0 | 0.0
Silicosis settlement costs2 |  | (4.5) | 30.2 | 0.0
Share-based payments |  | 37.5 | 26.8 | 14.0
Long-term incentive plan expense |  | 1.1 | 5.0 | 10.5
Payment of long-term incentive plan |  | (17.8) | (11.5) | 0.0
Borrowing costs capitalised |  | (17.5) | (22.9) | (15.1)
Share of results of equity accounted investees, net of taxation |  | 0.2 | (0.3) | 0.0
Other | [1] | (3.0) | (14.9) | 0.4
Total cash generated by operations |  | $ 998.0 | $ 1,286.5 | $ 1,245.4
[1] | The item "Other" in 2017 and 2016 has been disaggregated into unrealised gain on derivative contracts, fair value loss on Maverix warrants and silicosis settlement costs.

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