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COMMITMENTS AND CONTINGENCIES: - Environmental matters (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2011 person category
Environmental costs |  |  |  |
Environmental capital investment | $ 37.8 | $ 82.9 | $ 102.8 |
Peru |  |  |  |
Environmental costs |  |  |  |
Environmental capital investment |  | 18.6 | 59.3 |
Environmental capital investment | (3.3) |  |  |
Mexico |  |  |  |
Environmental costs |  |  |  |
Environmental capital investment | $ 41.1 | $ 64.3 | $ 43.5 |
Number of categories of collective actions | category |  |  |  | 3
Minimum number of people claiming injury due to collective action initiative in Civil Federal Procedures Code (CFPC) | person |  |  |  | 30

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- Definition Represents the minimum number of people claiming injury, to initiate collective action for environmental matters. + References No definition available. + Details
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- Definition Represents the number of categories of collective actions for environmental matters. + References No definition available. + Details
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- Definition Amount of environmental remediation costs capitalized. These expenditures may relate to long-lived improvements in operating facilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 25 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=39739230&loc=d3e11660-110855 + Details
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- Definition Amount of any recovery from third parties that is credited to environmental remediation costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13296-110859 + Details
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