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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Write-off of exploration and evaluation assets - continuing operations | $ 37.7 | $ 51.5 | $ 41.4
Write-off of exploration and evaluation assets - discontinued operations | 0.0 | 1.5 | 6.1
Borrowing costs capitalised | 17.5 | 22.9 | 15.1
Carrying value at end of the year | 4,259.2 | 4,892.9 |
Cost Price Property Plant And Equipment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Balance at beginning of the year | 10,560.7 | 9,566.2 |
Reclassifications | 0.0 | (20.5) |
Additions for continuing operations | 814.2 | 833.6 |
Additions for discontinued operations | 0.0 | 6.8 |
Finance leases capitalised (refer note 33) | 96.2 | 0.0 |
Reclassification (to)/from assets held for sale | 0.0 | (43.2) |
Borrowing costs capitalised | 17.5 | 22.9 |
Disposals | (528.7) | (215.1) |
Disposal of subsidiary | 0.0 | (79.1) |
Changes in estimates of rehabilitation assets | 24.1 | 8.3 |
Translation adjustment | (707.7) | 480.8 |
Balance at end of the year | 10,276.3 | 10,560.7 | 9,566.2
Accumulated depreciation and impairment [Member] |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Balance at beginning of the year | 5,667.8 | 5,041.6 |
Reclassifications | 0.0 | (20.5) |
Charge for the year continuing operations | 668.4 | 748.1 |
Charge for the year discontinued operations | 0.0 | 3.5 |
Impairment and reversal of impairment, net | 411.7 | (81.3) |
Write-off of exploration and evaluation assets - continuing operations | 37.7 | 51.5 |
Write-off of exploration and evaluation assets - discontinued operations | 0.0 | 1.5 |
Reclassification (to)/from assets held for sale | 0.0 | (3.2) |
Disposals | (398.2) | (213.1) |
Disposal of subsidiary | 0.0 | (75.8) |
Translation adjustment | (370.3) | 215.5 |
Balance at end of the year | 6,017.1 | 5,667.8 | 5,041.6
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 | 3,680.7 | 4,253.3 |
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 | 9,886.4 | 8,929.4 |
Reclassifications | 10.4 | 1.8 |
Additions for continuing operations | 800.2 | 833.3 |
Additions for discontinued operations | 0.0 | 6.8 |
Finance leases capitalised (refer note 33) | 96.2 | 0.0 |
Reclassification (to)/from assets held for sale | 0.0 | (43.2) |
Borrowing costs capitalised | 17.5 | 22.9 |
Disposals | (494.6) | (202.5) |
Disposal of subsidiary | 0.0 | (77.7) |
Changes in estimates of rehabilitation assets | 0.0 | 0.0 |
Translation adjustment | (653.8) | 415.6 |
Balance at end of the year | 9,662.3 | 9,886.4 | 8,929.4
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 | 5,633.1 | 5,014.8 |
Reclassifications | 0.0 | (20.5) |
Charge for the year continuing operations | 658.3 | 732.4 |
Charge for the year discontinued operations | 0.0 | 3.3 |
Impairment and reversal of impairment, net | 411.7 | (78.4) |
Write-off of exploration and evaluation assets - continuing operations | 37.7 | 51.5 |
Write-off of exploration and evaluation assets - discontinued operations | 0.0 | 1.5 |
Reclassification (to)/from assets held for sale | 0.0 | (3.2) |
Disposals | (391.6) | (200.9) |
Disposal of subsidiary | 0.0 | (74.5) |
Translation adjustment | (367.6) | 207.1 |
Balance at end of the year | 5,981.6 | 5,633.1 | 5,014.8
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 | 578.5 | 639.6 |
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 | 674.3 | 636.8 |
Reclassifications | (10.4) | (22.3) |
Additions for continuing operations | 14.0 | 0.3 |
Additions for discontinued operations | 0.0 | 0.0 |
Finance leases capitalised (refer note 33) | 0.0 | 0.0 |
Reclassification (to)/from assets held for sale | 0.0 | 0.0 |
Borrowing costs capitalised | 0.0 | 0.0 |
Disposals | (34.1) | (12.6) |
Disposal of subsidiary | 0.0 | (1.4) |
Changes in estimates of rehabilitation assets | 24.1 | 8.3 |
Translation adjustment | (53.9) | 65.2 |
Balance at end of the year | 614.0 | 674.3 | 636.8
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 | 34.7 | 26.8 |
Reclassifications | 0.0 | 0.0 |
Charge for the year continuing operations | 10.1 | 15.7 |
Charge for the year discontinued operations | 0.0 | 0.2 |
Impairment and reversal of impairment, net | 0.0 | (2.9) |
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 |
Disposals | (6.6) | (12.2) |
Disposal of subsidiary | 0.0 | (1.3) |
Translation adjustment | (2.7) | 8.4 |
Balance at end of the year | $ 35.5 | $ 34.7 | $ 26.8

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