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Other operating expenses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Other operational expenses [Line Items]      
Penalties for income tax related to disputed mining royalties   $ 33.8  
Penalties on disputed mining royalties   17.7  
Profit sharing adjustments related to GEM refund   $ 3.6  
Disputed royalties     $ 174.8
Penalties on ITAN     33.6
Profit sharing adjustments related to mining royalties     29.2
Penalties on disputed royalties     $ 6.2
INGEMMET      
Disclosure Other operational expenses [Line Items]      
Fines and penalties $ 6.8    
SUNAT      
Disclosure Other operational expenses [Line Items]      
Fines and penalties 4.7    
OSINERGMIN      
Disclosure Other operational expenses [Line Items]      
Fines and penalties $ 2.7