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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, 2020
Dec. 31, 2019
Dec. 31, 2018
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 $ 38.2 $ 53.6        
Interest related to the ITAN       $ 10.4 $ 10.4 $ 10.4
Interest of other taxes related to disputed mining royalty 5.6 2.9        
Interest associated with disputed mining royalties   $ 1.2        
Interest and interest on penalties associated to disputed mining royalties     $ 218.7      
Interest on income tax related to disputed mining royalties     75.7      
Interest related to the SMT     51.0      
Interest paid on royalty installment payment program     6.1      
Deferral interest related to the new royalty installment payment programs     5.3      
Interest of amended tax return     1.3      
Interest on royalties, interest paid on the royalty installment payment program and interest on royalty penalties     $ 12.1      
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