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Financial expenses - Additional inforamtion (Details) - Sociedad Minera Cerro Verde S.A.A. [Member] - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2013
Dec. 31, 2011
Dec. 31, 2010
Finance Expense [Line Items]            
Interest related to the installment payment programs for SMT and disputed mining royalties $ 14.6 $ 38.2 $ 53.6      
Interest related to the ITAN       $ 10.4 $ 10.4 $ 10.4
Interest of other taxes related to disputed mining royalty $ 0.7 5.6 2.9      
Interest associated with disputed mining royalties     $ 1.2      
Interests related to income tax assessment for the year 2013   31.4        
Interests related to uncertain income tax treatments (IFRIC 23) associated primarily to tailing dam income tax   13.1        
Interests related to SUNAT assessments   $ 8.7