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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Write-off of exploration and evaluation assets - continuing operations | $ 51.5 | $ 41.4 | [1] | $ 29.1 | [1]
Write-off of exploration and evaluation assets - discontinued operations | 1.5 | 6.1 | [1] | 1.7 | [1]
Borrowing costs capitalised | 22.9 | 15.1 | [1] | 16.6 | [1]
Carrying value at end of the year | 4,892.9 | 4,524.6 | [1] | 4,295.6 | [1]
Previously Stated [member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Carrying value at end of the year |  | 4,547.8 |  | 4,312.4 |
Cost Price Property Plant And Equipment [Member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Balance at beginning of the year | 9,566.2 | 8,648.8 |  |  |
Reclassifications | (20.5) | 1.0 |  |  |
Additions for continuing operations | 833.6 | 628.5 |  |  |
Additions for discontinued operations | 6.8 | 21.4 |  |  |
Gruyere Gold project asset acquisition | 0.0 | 275.9 |  |  |
Reclassification (to)/from assets held for sale | (43.2) | 43.2 |  |  |
Reclassification to assets held for sale | 0.0 | (79.1) |  |  |
Borrowing costs capitalised | 22.9 | 15.1 |  |  |
Disposals | (215.1) | (160.4) |  |  |
Disposal of subsidiary | (79.1) | 0.0 |  |  |
Changes in estimates of rehabilitation assets | 8.3 | 14.9 |  |  |
Other | 0.0 | 3.0 |  |  |
Translation adjustment | 480.8 | 153.9 |  |  |
Balance at end of the year | 10,560.7 | 9,566.2 |  | 8,648.8 |
Cost Price Property Plant And Equipment [Member] | Previously Stated [member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Balance at beginning of the year | 9,566.2 | 8,648.8 |  |  |
Balance at end of the year |  | 9,566.2 |  | 8,648.8 |
Cost Price Property Plant And Equipment [Member] | Increase (Decrease) Due to Corrections of Prior Period Errors [Member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Balance at beginning of the year | 0.0 | 0.0 |  |  |
Balance at end of the year |  | 0.0 |  | 0.0 |
Accumulated depreciation and impairment [Member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Balance at beginning of the year | 5,041.6 | 4,353.2 |  |  |
Reclassifications | (20.5) | 1.0 |  |  |
Charge for the year continuing operations | 748.1 | 671.4 |  |  |
Charge for the year discontinued operations | 3.5 | 14.4 |  |  |
Impairment and reversal of impairment, net | (81.3) | 76.4 |  |  |
Write-off of exploration and evaluation assets - continuing operations | 51.5 | 41.4 |  |  |
Write-off of exploration and evaluation assets - discontinued operations | 1.5 | 6.1 |  |  |
Reclassification (to)/from assets held for sale | (3.2) | 42.2 |  |  |
Reclassification to assets held for sale | 0.0 | (60.5) |  |  |
Disposals | (213.1) | (158.1) |  |  |
Disposal of subsidiary | (75.8) | 0.0 |  |  |
Translation adjustment | 215.5 | 54.1 |  |  |
Balance at end of the year | 5,667.8 | 5,041.6 |  | 4,353.2 |
Accumulated depreciation and impairment [Member] | Previously Stated [member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Balance at beginning of the year | 5,041.6 | 4,336.4 |  |  |
Balance at end of the year |  | 5,041.6 |  | 4,336.4 |
Accumulated depreciation and impairment [Member] | Increase (Decrease) Due to Corrections of Prior Period Errors [Member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Balance at beginning of the year | 0.0 | 16.8 |  |  |
Balance at end of the year |  | 0.0 |  | 16.8 |
Land mineral rights and rehabilitation assets [Member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Carrying value at end of the year | 639.6 | 610.0 |  |  |
Land mineral rights and rehabilitation assets [Member] | Cost Price Property Plant And Equipment [Member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Balance at beginning of the year | 636.8 | 351.3 |  |  |
Reclassifications | (22.3) | (10.6) |  |  |
Additions for continuing operations | 0.3 | 1.3 |  |  |
Additions for discontinued operations | 0.0 | 0.0 |  |  |
Gruyere Gold project asset acquisition | 0.0 | 275.9 |  |  |
Reclassification (to)/from assets held for sale | 0.0 | 0.0 |  |  |
Reclassification to assets held for sale | 0.0 | 0.0 |  |  |
Borrowing costs capitalised | 0.0 | 0.0 |  |  |
Disposals | (12.6) | (3.1) |  |  |
Disposal of subsidiary | (1.4) | 0.0 |  |  |
Changes in estimates of rehabilitation assets | 8.3 | 14.9 |  |  |
Other | 0.0 | 0.0 |  |  |
Translation adjustment | 65.2 | 7.1 |  |  |
Balance at end of the year | 674.3 | 636.8 |  | 351.3 |
Land mineral rights and rehabilitation assets [Member] | Cost Price Property Plant And Equipment [Member] | Previously Stated [member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Balance at beginning of the year | 636.8 | 735.6 |  |  |
Balance at end of the year |  | 636.8 |  | 735.6 |
Land mineral rights and rehabilitation assets [Member] | Cost Price Property Plant And Equipment [Member] | Increase (Decrease) Due to Corrections of Prior Period Errors [Member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Balance at beginning of the year | 0.0 | (384.3) |  |  |
Balance at end of the year |  | 0.0 |  | (384.3) |
Land mineral rights and rehabilitation assets [Member] | Accumulated depreciation and impairment [Member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Balance at beginning of the year | 26.8 | 19.4 |  |  |
Reclassifications | 0.0 | 0.0 |  |  |
Charge for the year continuing operations | 15.7 | 8.0 |  |  |
Charge for the year discontinued operations | 0.2 | 0.0 |  |  |
Impairment and reversal of impairment, net | (2.9) | 3.3 |  |  |
Write-off of exploration and evaluation assets - continuing operations | 0.0 | 0.0 |  |  |
Write-off of exploration and evaluation assets - discontinued operations | 0.0 | 0.0 |  |  |
Reclassification (to)/from assets held for sale | 0.0 | 0.0 |  |  |
Reclassification to assets held for sale | 0.0 | 0.0 |  |  |
Disposals | (12.2) | (3.1) |  |  |
Disposal of subsidiary | (1.3) | 0.0 |  |  |
Translation adjustment | 8.4 | (0.8) |  |  |
Balance at end of the year | 34.7 | 26.8 |  | 19.4 |
Land mineral rights and rehabilitation assets [Member] | Accumulated depreciation and impairment [Member] | Previously Stated [member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Balance at beginning of the year | 26.8 | 301.3 |  |  |
Balance at end of the year |  | 26.8 |  | 301.3 |
Land mineral rights and rehabilitation assets [Member] | Accumulated depreciation and impairment [Member] | Increase (Decrease) Due to Corrections of Prior Period Errors [Member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Balance at beginning of the year | 0.0 | (281.9) |  |  |
Balance at end of the year |  | 0.0 |  | (281.9) |
Mine development infrastructure and other assets [Member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Carrying value at end of the year | 4,253.3 | 3,914.6 |  |  |
Mine development infrastructure and other assets [Member] | Cost Price Property Plant And Equipment [Member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Balance at beginning of the year | 8,929.4 | 8,297.5 |  |  |
Reclassifications | 1.8 | 11.6 |  |  |
Additions for continuing operations | 833.3 | 627.2 |  |  |
Additions for discontinued operations | 6.8 | 21.4 |  |  |
Gruyere Gold project asset acquisition | 0.0 | 0.0 |  |  |
Reclassification (to)/from assets held for sale | (43.2) | 43.2 |  |  |
Reclassification to assets held for sale | 0.0 | (79.1) |  |  |
Borrowing costs capitalised | 22.9 | 15.1 |  |  |
Disposals | (202.5) | (157.3) |  |  |
Disposal of subsidiary | (77.7) | 0.0 |  |  |
Changes in estimates of rehabilitation assets | 0.0 | 0.0 |  |  |
Other | 0.0 | 3.0 |  |  |
Translation adjustment | 415.6 | 146.8 |  |  |
Balance at end of the year | 9,886.4 | 8,929.4 |  | 8,297.5 |
Mine development infrastructure and other assets [Member] | Cost Price Property Plant And Equipment [Member] | Previously Stated [member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Balance at beginning of the year | 8,929.4 | 7,913.2 |  |  |
Balance at end of the year |  | 8,929.4 |  | 7,913.2 |
Mine development infrastructure and other assets [Member] | Cost Price Property Plant And Equipment [Member] | Increase (Decrease) Due to Corrections of Prior Period Errors [Member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Balance at beginning of the year | 0.0 | 384.3 |  |  |
Balance at end of the year |  | 0.0 |  | 384.3 |
Mine development infrastructure and other assets [Member] | Accumulated depreciation and impairment [Member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Balance at beginning of the year | 5,014.8 | 4,333.8 |  |  |
Reclassifications | (20.5) | 1.0 |  |  |
Charge for the year continuing operations | 732.4 | 663.4 |  |  |
Charge for the year discontinued operations | 3.3 | 14.4 |  |  |
Impairment and reversal of impairment, net | (78.4) | 73.1 |  |  |
Write-off of exploration and evaluation assets - continuing operations | 51.5 | 41.4 |  |  |
Write-off of exploration and evaluation assets - discontinued operations | 1.5 | 6.1 |  |  |
Reclassification (to)/from assets held for sale | (3.2) | 42.2 |  |  |
Reclassification to assets held for sale | 0.0 | (60.5) |  |  |
Disposals | (200.9) | (155.0) |  |  |
Disposal of subsidiary | (74.5) | 0.0 |  |  |
Translation adjustment | 207.1 | 54.9 |  |  |
Balance at end of the year | 5,633.1 | 5,014.8 |  | 4,333.8 |
Mine development infrastructure and other assets [Member] | Accumulated depreciation and impairment [Member] | Previously Stated [member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Balance at beginning of the year | 5,014.8 | 4,035.1 |  |  |
Balance at end of the year |  | 5,014.8 |  | 4,035.1 |
Mine development infrastructure and other assets [Member] | Accumulated depreciation and impairment [Member] | Increase (Decrease) Due to Corrections of Prior Period Errors [Member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Balance at beginning of the year | $ 0.0 | 298.7 |  |  |
Balance at end of the year |  | $ 0.0 |  | $ 298.7 |
[1] | As Restated - Refer note 40 for further details.

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