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Other accounts payable - Additional information (Details) - Sociedad Minera Cerro Verde S.A.A. [Member] - USD ($)
$ in Millions
 12 Months Ended 36 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2013
Disclosure of other accounts payable [Line Items]      
Interest And Penalties Non Current   $ 186.5  
Special Mining Tax   336.0 $ 254.2
Interest and penalties of disputed mining royalties $ 16.5 16.6  
Withholding income tax 7.7 2.8  
Pension funds 2.3 2.2  
Other employee related payables $ 1.4 $ 0.9