ASSET RETIREMENT OBLIGATION: (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013 item Year	Dec. 31, 2012
ASSET RETIREMENT OBLIGATION:
Period after which successive reviews are required by the law (in years)	5
Accepted value of the Lima office building	$ 27.8
Cumulative guarantee amount	14.2
Number of units with future closure costs recognized as an asset retirement obligation	3
Increase to net property due to closure of mine		20.3
Asset retirement obligation activity
Balance at the beginning of the period	118.2	62.0
Changes in estimates		27.4
Additions		25.1
Closure payments	(1.5)	(0.3)
Accretion expense	8.1	4.0
Balance at the end of the period	$ 124.8	$ 118.2

Represents the cumulative amount of Guarantees paid for an asset retirement obligation.

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- Definition

Represents the increase to the carrying amount of the related long-lived asset due to asset retirement obligation.

+ References

No definition available.

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- Definition

Represents the period after which successive reviews are required by the law.

+ References

No definition available.

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- Definition

Represents the number of units for which the entity has recognized an asset retirement obligation.

+ References

No definition available.

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- Definition

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 143

-Paragraph 3, 10, 22

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Asset Retirement Obligation

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- Definition

Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

+ References

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Amount of asset retirement obligations incurred during the period.

+ References

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- Definition

Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Amount of the Increase or Decrease in the amount of the asset retirement obligation during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

+ References

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- Definition

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software, net of accumulated depreciation.

+ References

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