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Property, Plant and Equipment (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of changes in property, plant and equipment [abstract]      
Balance at beginning of the year $ 4,771.2    
Write-off of exploration and evaluation assets1 (21.3) $ (16.9) $ (30.0)
Borrowing costs capitalised 12.5 13.2 43.4
Balance at end of the year 5,079.1 4,771.2  
Carrying value at end of the year 5,079.1 4,771.2  
Exploration expense 60.6 49.7 84.4
Damang mining fleet and related spare      
Reconciliation of changes in property, plant and equipment [abstract]      
Borrowing costs capitalised 0.0 12.1  
Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance at beginning of the year 11,801.6 10,972.4  
Reclassifications 0.0 0.3  
Additions 1,088.7 583.7  
Salares Norte project costs capitalised 7.5 1.3  
Right-of-use assets capitalised during the year (refer note 33) 54.4 127.2  
Remeasurements of right-of-use assets capitalised (refer note 33) 19.1 12.8  
Borrowing costs capitalised 12.5 13.2  
Disposals 13.4 8.7  
Scrapping of assets 449.9 101.7  
Changes in estimates of rehabilitation assets 66.1 (6.6)  
Translation adjustment 417.6 (208.3)  
Balance at end of the year 12,169.0 11,801.6 10,972.4
Carrying value at end of the year 12,169.0 11,801.6 10,972.4
Accumulated depreciation and impairment      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance at beginning of the year (7,030.4) (6,315.3)  
Reclassifications 0.0 (0.3)  
Charge for the year 713.2 661.3  
Salares Norte depreciation capitalised 7.0 0.6  
Impairment 11.6 11.7  
Write-off of exploration and evaluation assets1 21.3 16.9  
Disposals (12.2) (7.8)  
Scrapping of assets (449.9) (101.7)  
Translation adjustment (231.5) 134.4  
Balance at end of the year (7,089.9) (7,030.4) (6,315.3)
Carrying value at end of the year (7,089.9) (7,030.4) (6,315.3)
Land, mineral rights and rehabilitation assets      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance at beginning of the year 351.9    
Balance at end of the year 374.5 351.9  
Carrying value at end of the year 374.5 351.9  
Land, mineral rights and rehabilitation assets | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance at beginning of the year 424.3 432.3  
Reclassifications 7.8 12.8  
Additions 1.9 0.4  
Salares Norte project costs capitalised 0.0 0.0  
Right-of-use assets capitalised during the year (refer note 33) 0.0 0.0  
Remeasurements of right-of-use assets capitalised (refer note 33) 0.0 0.0  
Borrowing costs capitalised 0.0 0.0  
Disposals 0.0 0.0  
Scrapping of assets 0.9 0.8  
Changes in estimates of rehabilitation assets 66.1 (6.6)  
Translation adjustment 16.7 (11.8)  
Balance at end of the year 466.9 424.3 432.3
Carrying value at end of the year 466.9 424.3 432.3
Land, mineral rights and rehabilitation assets | Accumulated depreciation and impairment      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance at beginning of the year (72.4) (43.6)  
Reclassifications 0.0 (0.2)  
Charge for the year 20.6 20.2  
Salares Norte depreciation capitalised 0.0 0.0  
Impairment 0.0 0.0  
Write-off of exploration and evaluation assets1 0.0 0.0  
Disposals 0.0 0.0  
Scrapping of assets (0.9) (0.8)  
Translation adjustment 0.3 9.6  
Balance at end of the year (92.4) (72.4) (43.6)
Carrying value at end of the year (92.4) (72.4) (43.6)
Mine development, infrastructure and other assets      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance at beginning of the year 3,990.7    
Balance at end of the year 4,292.7 3,990.7  
Carrying value at end of the year 4,292.7 3,990.7  
Mine development, infrastructure and other assets | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance at beginning of the year 10,850.8 10,167.1  
Reclassifications (10.9) (12.6)  
Additions 1,086.8 583.3  
Salares Norte project costs capitalised 7.5 1.3  
Right-of-use assets capitalised during the year (refer note 33) 0.0 0.0  
Remeasurements of right-of-use assets capitalised (refer note 33) 0.0 0.0  
Borrowing costs capitalised 12.5 13.2  
Disposals 13.4 8.7  
Scrapping of assets 427.0 88.1  
Changes in estimates of rehabilitation assets 0.0 0.0  
Translation adjustment 384.1 (170.1)  
Balance at end of the year 11,144.0 10,850.8 10,167.1
Carrying value at end of the year 11,144.0 10,850.8 10,167.1
Mine development, infrastructure and other assets | Accumulated depreciation and impairment      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance at beginning of the year (6,860.1) (6,227.7)  
Reclassifications 0.0 (0.1)  
Charge for the year 622.8 581.9  
Salares Norte depreciation capitalised 1.8 0.0  
Impairment 11.6 11.7  
Write-off of exploration and evaluation assets1 21.3 16.9  
Disposals (12.2) (7.8)  
Scrapping of assets (427.0) (88.1)  
Translation adjustment (227.1) 117.9  
Balance at end of the year (6,851.3) (6,860.1) (6,227.7)
Carrying value at end of the year (6,851.3) (6,860.1) (6,227.7)
Right-of-use assets relating to mine development, infrastructure and other assets      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance at beginning of the year 428.6    
Balance at end of the year 411.9 428.6  
Carrying value at end of the year 411.9 428.6  
Right-of-use assets relating to mine development, infrastructure and other assets | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance at beginning of the year 526.5 373.0  
Reclassifications 3.1 0.1  
Additions 0.0 0.0  
Salares Norte project costs capitalised 0.0 0.0  
Right-of-use assets capitalised during the year (refer note 33) 54.4 127.2  
Remeasurements of right-of-use assets capitalised (refer note 33) 19.1 12.8  
Borrowing costs capitalised 0.0 0.0  
Disposals 0.0 0.0  
Scrapping of assets 22.0 12.8  
Changes in estimates of rehabilitation assets 0.0 0.0  
Translation adjustment 16.8 (26.4)  
Balance at end of the year 558.1 526.5 373.0
Carrying value at end of the year 558.1 526.5 373.0
Right-of-use assets relating to mine development, infrastructure and other assets | Accumulated depreciation and impairment      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance at beginning of the year (97.9) (44.0)  
Reclassifications 0.0 0.0  
Charge for the year 69.8 59.2  
Salares Norte depreciation capitalised 5.2 0.6  
Impairment 0.0 0.0  
Write-off of exploration and evaluation assets1 0.0 0.0  
Disposals 0.0 0.0  
Scrapping of assets (22.0) (12.8)  
Translation adjustment (4.7) 6.9  
Balance at end of the year (146.2) (97.9) (44.0)
Carrying value at end of the year (146.2) (97.9) $ (44.0)
Salares Norte project      
Reconciliation of changes in property, plant and equipment [abstract]      
Borrowing costs capitalised $ 12.5 $ 1.1  
Average interest capitalisation rate 5.90% 4.40%