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COMMITMENTS AND CONTINGENCIES: - Environmental matters (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2011 category person
Environmental costs
Environmental capital investment	$ 61.4	$ 68.7	$ 37.8
Peru
Environmental costs
Environmental capital investment	8.7	6.4	3.3
Mexico
Environmental costs
Environmental capital investment	$ 52.7	$ 62.3	$ 41.1
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://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 30
-Section 25
-Paragraph 18
-URI https://asc.fasb.org/extlink&oid=39739230&loc=d3e11660-110855

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