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Commitments - Schedule of Lease Contracts (Detail) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure Of Lease Contracts [Line Items]    
Capital expenditure $ 78.1 $ 251.9
Undiscounted lease liabilities 512.2 547.1
Non-lease elements 519.0 738.1
Fully variable lease payments 2,865.4 1,268.0
Total 3,896.6 2,553.2
Salares Norte    
Disclosure Of Lease Contracts [Line Items]    
Capital expenditure 31.6 193.3
– within one year    
Disclosure Of Lease Contracts [Line Items]    
Undiscounted lease liabilities 84.8 82.0
Non-lease elements 232.4 249.4
Fully variable lease payments 537.7 397.8
Total 854.9 729.2
– later than one year and not later than two years    
Disclosure Of Lease Contracts [Line Items]    
Undiscounted lease liabilities 232.3 216.4
Non-lease elements 178.8 320.9
Fully variable lease payments 1,313.7 870.2
Total 1,724.8 1,407.5
– later than five years    
Disclosure Of Lease Contracts [Line Items]    
Undiscounted lease liabilities 195.1 248.7
Non-lease elements 107.8 167.8
Fully variable lease payments 1,014.0 0.0
Total $ 1,316.9 $ 416.5