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COMMITMENTS AND CONTINGENCIES: - Environmental matters (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2011 person category
Environmental costs
Environmental capital investment	$ 82.9	$ 102.8	$ 222.6
Peru
Environmental costs
Environmental capital investment	18.6	59.3	93.7
Mexico
Environmental costs
Environmental capital investment	$ 64.3	$ 43.5	$ 128.9
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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