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ASSET RETIREMENT OBLIGATION: (Details) $ in Millions | 3 Months Ended
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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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- Definition Represents the period after which successive reviews are required by the law. + References No definition available. + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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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) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848 + Details
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