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COMMITMENTS AND CONTINGENCIES: - Environmental matters (Details) $ in Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2011 category person
Environmental costs
Environmental capital investment	$ 77.6	$ 42.5
Peru
Environmental costs
Environmental capital investment	5.5	7.1
Mexico
Environmental costs
Environmental capital investment	$ 72.1	$ 35.4
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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- Definition

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
-Topic 410
-SubTopic 30
-Name Accounting Standards Codification
-Section 25
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482049/410-30-25-18

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