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Commitments and contingencies - Letters of credit (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 PEN (S/) shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Disclosure of Commitments and contingencies [Line Items] |  |  |
Letters of guarantee | S/ 1,780,126,238 | $ 140.0 | $ 121.4
Consorcio Energtico de Huancavelica S.A. |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |
Security interest on number of shares owned in favor of the financial entities | 186,413,288 |  |
Inversiones Colquijirca S.A. |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |
Security interest on number of shares owned in favor of the financial entities | 90,846,185 |  |
Sociedad Minera Cerro Verde S.A.A. [Member] |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |
Security interest on number of shares owned in favor of the financial entities | 68,556,629 |  |
Minera Yanacocha S.R.L |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |
Security interest on number of shares owned in favor of the financial entities | 558,044,001 |  |
Empresa de Generacin Huanza S.A |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |
Security interest on number of shares owned in favor of the financial entities | 1 |  |
Sociedad Minera El Brocal S.A.A |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |
Security interest on number of shares owned in favor of the financial entities | 4,965,941 |  |
Compaa Minera Condesa S.A |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |
Security interest on number of shares owned in favor of the financial entities | 21,130,260 |  |

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