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Commitments - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of Information about Guarantees [Line Items] |  |
Leases contracted for |  | $ 33.4
Contractual capital commitments | $ 514.7 | 47.9
Salares Norte [Member] |  |
Disclosure of Information about Guarantees [Line Items] |  |
Contractual capital commitments | 514.7 |
Payments for development project expenditure | 454.0 |
South African Peruvian Ghanaian And Australian Operations [member] |  |
Disclosure of Information about Guarantees [Line Items] |  |
Environmental obligation guarantees amount | $ 191.8 | $ 154.3

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