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ASSET RETIREMENT OBLIGATION: (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($) item	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)
Asset retirement obligation activity
Balance at the beginning of the year	$ 217.7	$ 220.5	$ 222.5
Changes in estimates	28.1		(5.2)
Closure Payments	(0.2)
Accretion expense	3.0		3.2
Balance at the end of the year	$ 248.6		$ 220.5
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
Environmental cost
Plant demolition and soil remediation cost	$ 66.2
Asset retirement obligation activity
Changes in estimates		$ (10.4)

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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.

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

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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.

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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.

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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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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.

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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.

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Carrying amount as of the balance sheet date of the liability for remediation, site restoration, postclosure, monitoring commitments, or other exit costs associated with the sale, disposal or abandonment of a particular property resulting from unanticipated contamination of the assets.

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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.

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