ASSET RETIREMENT OBLIGATION: (Details) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) item	Jun. 30, 2018 USD ($)
Asset retirement obligation activity
Balance at the beginning of the year		$ 217.7	$ 222.5
Changes in estimates		25.2	(15.6)
Closure Payments		(0.4)
Accretion expense		6.2	6.2
Balance at the end of the year	$ 213.1	$ 248.7	$ 213.1
Peru
ASSET RETIREMENT OBLIGATION:
Period after which successive reviews are required by the law (in years)		5 years
Accepted value of the Lima office complex and warehouse		$ 45.3
Cumulative guarantee amount		$ 37.8
Number of units with future closure costs recognized as an asset retirement obligation \| item		3
Asset retirement obligation activity
Changes in estimates		$ 28.1
Mexico
Asset retirement obligation activity
Changes in estimates	$ (10.4)

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

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

+ References

No definition available.

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

+ References

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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

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- References

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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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)(3)
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-SubTopic 20
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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.

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- Definition

Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Fair value portion of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
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