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Property, Plant and Equipment (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Reconciliation of changes in property, plant and equipment [abstract]      
Balance at beginning of the year $ 5,079.1    
General borrowing costs capitalised 37.9 $ 12.5 $ 13.2
Write-off of exploration and evaluation assets 0.0 (21.3) (16.9)
Balance at end of the year 4,815.7 5,079.1  
Carrying value at end of the year 4,815.7 5,079.1  
Exploration expense 81.0 60.6 49.7
Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance at beginning of the year 12,169.0 11,801.6  
Reclassifications 0.0 0.0  
Additions 1,069.3 1,088.7  
Salares Norte project costs capitalised 6.3 7.5  
Right-of-use assets capitalised during the year (refer note 33) 47.9 54.4  
Remeasurements of right-of-use assets capitalised (refer note 33) 11.6 19.1  
General borrowing costs capitalised 37.9 12.5  
Disposals 20.9 13.4  
Scrapping of assets 116.8 449.9  
Changes in estimates of rehabilitation assets (22.1) 66.1  
Translation adjustment 389.4 417.6  
Balance at end of the year 12,792.8 12,169.0 11,801.6
Carrying value at end of the year 12,792.8 12,169.0 11,801.6
Accumulated depreciation and impairment      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance at beginning of the year (7,089.9) (7,030.4)  
Disposals (19.9) (12.2)  
Scrapping of assets (116.8) (449.9)  
Translation adjustment (215.8) (231.5)  
Charge for the year 844.3 713.2  
Salares Norte depreciation capitalised 4.0 7.0  
Impairment 391.4 11.6  
Write-off of exploration and evaluation assets 0.0 21.3  
Balance at end of the year (7,977.1) (7,089.9) (7,030.4)
Carrying value at end of the year (7,977.1) (7,089.9) (7,030.4)
Land, mineral rights and rehabilitation assets      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance at beginning of the year 374.5    
Balance at end of the year 313.6 374.5  
Carrying value at end of the year 313.6 374.5  
Land, mineral rights and rehabilitation assets | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance at beginning of the year 466.9 424.3  
Reclassifications 1.8 7.8  
Additions 10.8 1.9  
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  
General borrowing costs capitalised 0.0 0.0  
Disposals 0.0 0.0  
Scrapping of assets 5.8 0.9  
Changes in estimates of rehabilitation assets (22.1) 66.1  
Translation adjustment 16.0 16.7  
Balance at end of the year 432.0 466.9 424.3
Carrying value at end of the year 432.0 466.9 424.3
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 (92.4) (72.4)  
Disposals 0.0 0.0  
Scrapping of assets (5.8) (0.9)  
Translation adjustment (1.4) 0.3  
Charge for the year 25.6 20.6  
Salares Norte depreciation capitalised 0.0 0.0  
Impairment 7.6 0.0  
Write-off of exploration and evaluation assets 0.0 0.0  
Balance at end of the year (118.4) (92.4) (72.4)
Carrying value at end of the year (118.4) (92.4) (72.4)
Mine development, infrastructure and other assets      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance at beginning of the year 4,292.7    
Balance at end of the year 4,163.8 4,292.7  
Carrying value at end of the year 4,163.8 4,292.7  
Mine development, infrastructure and other assets | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance at beginning of the year 11,144.0 10,850.8  
Reclassifications (1.8) (10.9)  
Additions 1,058.5 1,086.8  
Salares Norte project costs capitalised 6.3 7.5  
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  
General borrowing costs capitalised 37.9 12.5  
Disposals 20.9 13.4  
Scrapping of assets 90.7 427.0  
Changes in estimates of rehabilitation assets 0.0 0.0  
Translation adjustment 354.2 384.1  
Balance at end of the year 11,782.7 11,144.0 10,850.8
Carrying value at end of the year 11,782.7 11,144.0 10,850.8
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 (6,851.3) (6,860.1)  
Disposals (19.9) (12.2)  
Scrapping of assets (90.7) (427.0)  
Translation adjustment (209.5) (227.1)  
Charge for the year 746.1 622.8  
Salares Norte depreciation capitalised 2.3 1.8  
Impairment 339.3 11.6  
Write-off of exploration and evaluation assets 0.0 21.3  
Balance at end of the year (7,618.9) (6,851.3) (6,860.1)
Carrying value at end of the year (7,618.9) (6,851.3) (6,860.1)
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 411.9    
Balance at end of the year 338.3 411.9  
Carrying value at end of the year 338.3 411.9  
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 558.1 526.5  
Reclassifications 0.0 3.1  
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) 47.9 54.4  
Remeasurements of right-of-use assets capitalised (refer note 33) 11.6 19.1  
General borrowing costs capitalised 0.0 0.0  
Disposals 0.0 0.0  
Scrapping of assets 20.3 22.0  
Changes in estimates of rehabilitation assets 0.0 0.0  
Translation adjustment 19.2 16.8  
Balance at end of the year 578.1 558.1 526.5
Carrying value at end of the year 578.1 558.1 526.5
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 (146.2) (97.9)  
Disposals 0.0 0.0  
Scrapping of assets (20.3) (22.0)  
Translation adjustment (4.9) (4.7)  
Charge for the year 72.6 69.8  
Salares Norte depreciation capitalised 1.7 5.2  
Impairment 44.5 0.0  
Write-off of exploration and evaluation assets 0.0 0.0  
Balance at end of the year (239.8) (146.2) (97.9)
Carrying value at end of the year $ (239.8) $ (146.2) $ (97.9)
Salares Norte project      
Reconciliation of changes in property, plant and equipment [abstract]      
Average interest capitalisation rate 6.40% 5.90%