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Property, Plant and Equipment (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of changes in property, plant and equipment [abstract]      
Balance at beginning of the year $ 4,815.7    
General borrowing costs capitalised 64.9 $ 37.9 $ 12.5
Balance at end of the year 5,074.4 4,815.7  
Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance at beginning of the year 12,792.8 12,169.0  
Reclassifications 9.8 0.0  
Additions 1,054.7 1,069.3  
Other Salares Norte non-cash costs capitalised 13.2 6.3  
Right-of-use assets capitalised during the year (refer note 36) 98.0 47.9  
Remeasurements of right-of-use assets capitalised (refer note 33) 16.3 11.6  
General borrowing costs capitalised 64.9 37.9  
Disposals 8.0 20.9  
Scrapping of assets 141.3 116.8  
Changes in estimates of rehabilitation assets (refer note 28.1) 53.9 (22.1)  
Translation adjustment 164.8 389.4  
Balance at end of the year 13,769.9 12,792.8 12,169.0
Accumulated depreciation and impairment      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance at beginning of the year (7,977.1) (7,089.9)  
Disposals (6.5) (19.9)  
Scrapping of assets (141.3) (116.8)  
Translation adjustment (82.6) (215.8)  
Reclassifications (9.8) 0.0  
Charge for the year 795.3 844.3  
Salares Norte depreciation capitalised 6.9 4.0  
Impairment 156.4 391.4  
Balance at end of the year (8,695.5) (7,977.1) (7,089.9)
Land, mineral rights and rehabilitation assets      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance at beginning of the year 313.6    
Balance at end of the year 305.9 313.6  
Land, mineral rights and rehabilitation assets | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance at beginning of the year 432.0 466.9  
Reclassifications 3.4 1.8  
Additions 2.5 10.8  
Other Salares Norte non-cash costs capitalised 0.0 0.0  
Right-of-use assets capitalised during the year (refer note 36) 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 0.3 5.8  
Changes in estimates of rehabilitation assets (refer note 28.1) 53.9 (22.1)  
Translation adjustment 4.7 16.0  
Balance at end of the year 480.0 432.0 466.9
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 (118.4) (92.4)  
Disposals 0.0 0.0  
Scrapping of assets (0.3) (5.8)  
Translation adjustment 3.7 (1.4)  
Reclassifications 0.0 0.0  
Charge for the year 18.8 25.6  
Salares Norte depreciation capitalised 0.0 0.0  
Impairment 33.5 7.6  
Balance at end of the year (174.1) (118.4) (92.4)
Mine development, infrastructure and other assets      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance at beginning of the year 4,163.8    
Balance at end of the year 4,396.4 4,163.8  
Mine development, infrastructure and other assets | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance at beginning of the year 11,782.7 11,144.0  
Reclassifications (3.1) (1.8)  
Additions 1,052.2 1,058.5  
Other Salares Norte non-cash costs capitalised 13.2 6.3  
Right-of-use assets capitalised during the year (refer note 36) 0.0 0.0  
Remeasurements of right-of-use assets capitalised (refer note 33) 0.0 0.0  
General borrowing costs capitalised 64.9 37.9  
Disposals 8.0 20.9  
Scrapping of assets 109.3 90.7  
Changes in estimates of rehabilitation assets (refer note 28.1) 0.0 0.0  
Translation adjustment 160.8 354.2  
Balance at end of the year 12,638.0 11,782.7 11,144.0
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 (7,618.9) (6,851.3)  
Disposals (6.5) (19.9)  
Scrapping of assets (110.8) (90.7)  
Translation adjustment (86.6) (209.5)  
Reclassifications (1.2) 0.0  
Charge for the year 700.0 746.1  
Salares Norte depreciation capitalised 4.9 2.3  
Impairment 122.9 339.3  
Balance at end of the year (8,241.6) (7,618.9) (6,851.3)
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 338.3    
Balance at end of the year 372.1 338.3  
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 578.1 558.1  
Reclassifications 9.5 0.0  
Additions 0.0 0.0  
Other Salares Norte non-cash costs capitalised 0.0 0.0  
Right-of-use assets capitalised during the year (refer note 36) 98.0 47.9  
Remeasurements of right-of-use assets capitalised (refer note 33) 16.3 11.6  
General borrowing costs capitalised 0.0 0.0  
Disposals 0.0 0.0  
Scrapping of assets 31.7 20.3  
Changes in estimates of rehabilitation assets (refer note 28.1) 0.0 0.0  
Translation adjustment (0.7) 19.2  
Balance at end of the year 651.9 578.1 558.1
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 (239.8) (146.2)  
Disposals 0.0 0.0  
Scrapping of assets (30.2) (20.3)  
Translation adjustment 0.3 (4.9)  
Reclassifications (8.6) 0.0  
Charge for the year 76.5 72.6  
Salares Norte depreciation capitalised 2.0 1.7  
Impairment 0.0 44.5  
Balance at end of the year $ (279.8) $ (239.8) $ (146.2)
Salares Norte project      
Reconciliation of changes in property, plant and equipment [abstract]      
Average interest capitalisation rate 6.60% 6.40%