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ASSET RETIREMENT OBLIGATION: (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 USD ($) item | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($)
ASSET RETIREMENT OBLIGATION: |  |  |
Maximum annual guarantees secured | 50.00% |  |
Percentage of guarantee for Lima complex | 50.00% |  |
Percentage of security for LOC | 50.00% |  |
Total guarantees | $ 47.1 |  |
Asset retirement obligation activity |  |  |
Balance at the beginning of the year | 262.3 | $ 217.7 | $ 217.7
Changes in estimates |  | 28.1 |
Closure Payments | (0.6) | (0.2) |
Accretion expense | 3.8 | 3.0 |
Balance at the end of the year | $ 265.5 | $ 248.6 | 262.3
Peru |  |  |
ASSET RETIREMENT OBLIGATION: |  |  |
Period after which successive reviews are required by the law (in years) | 5 years |  |
Number of units with future closure costs recognized as an asset retirement obligation | item | 3 |  |
Asset retirement obligation activity |  |  |
Changes in estimates |  |  | $ 28.1

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- Definition Represents the number of units for which the entity has recognized an asset retirement obligation. + References No definition available. + Details
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- Definition Maximum percentage of annual guarantees secured. + 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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- 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=118943654&loc=d3e12069-110248 + Details
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