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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) - USD ($)
$ in Millions
 12 Months Ended
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