Information related to significant accounting policies of the reporting entity.

No definition available.

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- Definition

The amount of decrease in deferred income tax asset.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of increase in deferred tax asset.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

Represents the approximate percentage of increase in the total reserves at a property before the work qualifies as a major expansion of reserves.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of open-pit copper mining properties.

+ References

No definition available.

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Data Type:	xbrli:integerItemType
Balance Type:	na
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- Definition

Represents the number of reportable segments of the entity.

+ References

No definition available.

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Balance Type:	na
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- Definition

Represents the number of underground poly metal mining properties.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
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- Definition

Represents the number of years of average prices for copper and molybdenum used for impairment analysis.

+ References

No definition available.

+ Details

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- Definition

Represents the price per pound of copper considered to determine the average price used for the valuation of ore reserves.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Represents the number of years preceding periods considered for the calculation of average metal prices used to determine the amortization of mine development and intangible assets.

+ References

No definition available.

+ Details

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- Definition

The percentage of metal production sold under annual or longer-term contracts.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
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Period Type:	duration

- Definition

Represents the information relating to quantity of minerals during the period.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the number of months subsequent to shipping in which customer contracts allow for pricing on certain products.

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
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- Definition

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

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Balance Type:	na
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) t segment item $ / lb	Dec. 31, 2018 USD ($) $ / lb	Dec. 31, 2017 $ / lb
Significant Accounting Policies
Increase in total reserves at a property to qualify as a major expansion (as a percent)	10.00%
Period considered for calculation of average metal price	3 years
Current price of copper (in dollars per pound) \| $ / lb	2.82	2.64	2.50
U.S. statutory rate (as a percent)	21.00%	21.00%	35.00%
Impairment in the carrying value of long-term assets \| $	$ 0.0
Number of years of average prices for copper and molybdenum used for impairment analysis	3 years
Number of reportable segments \| segment	3
Decrease in deferred income tax asset \| $		$ 207.1
Increase in deferred tax asset \| $		$ 9.9
Copper concentrates
Significant Accounting Policies
Long-term contracts with promises to deliver mineral	870,000
Copper cathodes
Significant Accounting Policies
Long-term contracts with promises to deliver mineral	48,000
Molybdenum concentrates
Significant Accounting Policies
Long-term contracts with promises to deliver mineral	24,000
Sulfuric acid
Significant Accounting Policies
Long-term contracts with promises to deliver mineral	292,400
Minimum
Financial information related to segments
Estimated useful lives of buildings and equipment	2 years
Significant Accounting Policies
Percentage Of Metal Production Sold Under Annual Or Longer Term Contracts	80.00%
Maximum
Financial information related to segments
Maximum period after shipping within which pricing is based by customer contracts in most cases	3 months
Estimated useful lives of buildings and equipment	50 years
Significant Accounting Policies
Percentage Of Metal Production Sold Under Annual Or Longer Term Contracts	90.00%
Peruvian Operations
Financial information related to segments
Number of open-pit copper mines \| item	2
Mexican IMMSA Unit
Financial information related to segments
Number of underground poly metal mines \| item	5