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Revenue - Summary of Revenue from Contracts with Customers (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |
Revenue from contracts with customers |  | $ 3,892.1 | $ 2,967.1 | $ 2,577.8
Gold [member] |  |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |
Revenue from contracts with customers | [1] | 3,748.0 | 2,802.0 | 2,408.6
Copper [member] |  |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |  |
Revenue from contracts with customers | [2] | $ 144.1 | $ 165.1 | $ 169.2
[1] | All regions.
[2] | Only Peru region (Cerro Corona).

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- Definition The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2020-01-01 -Paragraph 113 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_113_a&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2020-01-01 -Paragraph 114 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_114&doctype=Standard -URIDate 2020-01-01 + Details
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