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COMMITMENTS AND CONTINGENCIES: - Environmental matters (Details) $ in Millions	12 Months Ended
	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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Represents the minimum number of people claiming injury, to initiate collective action for environmental matters.

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Represents the number of categories of collective actions for environmental matters.

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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

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Amount of any recovery from third parties that is credited to environmental remediation costs.

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-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

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