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Cost of sales, without considering depreciation and amortization - Additional information (Details) - Sociedad Minera Cerro Verde S.A.A. [Member] - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of cost of sales [Line Items]      
Increase decrease in labor costs related to profit sharing $ 32.2 $ 60.2 $ 86.4
Administrative expense directly related to cost of production $ 32.0 $ 30.7 $ 34.4