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Commitments - Schedule of Lease Contracts (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure Of Lease Contracts [Line Items]    
Capital expenditure $ 251.9 $ 514.7
Undiscounted lease liabilities 547.1 578.3
Non-lease elements 738.1 498.2
Fully variable lease payments 1,268.0 2,089.3
Total 2,553.2 3,165.8
Salares Norte    
Disclosure Of Lease Contracts [Line Items]    
Capital expenditure 251.9 514.7
Payments for development project expenditure 193.3 454.0
– within one year    
Disclosure Of Lease Contracts [Line Items]    
Undiscounted lease liabilities 82.0 88.4
Non-lease elements 249.4 126.0
Fully variable lease payments 397.8 583.0
Total 729.2 797.4
– later than one year and not later than two years    
Disclosure Of Lease Contracts [Line Items]    
Undiscounted lease liabilities 216.4 228.7
Non-lease elements 320.9 296.3
Fully variable lease payments 870.2 1,506.3
Total 1,407.5 2,031.3
– later than five years    
Disclosure Of Lease Contracts [Line Items]    
Undiscounted lease liabilities 248.7 261.2
Non-lease elements 167.8 75.9
Fully variable lease payments 0.0 0.0
Total $ 416.5 $ 337.1