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ASSET RETIREMENT OBLIGATION: (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 24, 2019 | Mar. 31, 2024 USD ($) item | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2019 USD ($) | Jan. 31, 2023 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 |  |  |  |  |  | $ 77.1
Asset retirement obligation, increase (decrease) in asset due to revision in estimate |  |  |  | $ (43.3) |  |
Asset retirement obligation activity |  |  |  |  |  |
Balance at the beginning of the year |  | $ 612.5 | $ 585.3 |  |  |
Decrease in estimates |  | (2.3) |  |  |  |
Closure payments |  |  | (0.2) |  |  |
Accretion expense |  | 7.6 | 6.4 |  |  |
Balance at the end of the year |  | $ 617.8 | $ 591.5 | 585.3 |  |
Cost of goods sold |  |  |  |  |  |
ASSET RETIREMENT OBLIGATION: |  |  |  |  |  |
Asset retirement obligations, increase (decrease) in estimate |  |  |  | (16.2) |  |
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 |  |  |  |
Change in asset retirement liability |  |  |  | $ (59.5) |  |
Asset retirement obligation activity |  |  |  |  |  |
Decrease in estimates |  |  |  |  | $ 28.1 |
Mexico |  |  |  |  |  |
Asset retirement obligation activity |  |  |  |  |  |
Decrease in estimates |  | $ (2.3) |  |  |  |

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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/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 25 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481999/410-20-25-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481850/410-20-50-1 + Details
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