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ASSET RETIREMENT OBLIGATION: (Details) $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 24, 2019 | Mar. 31, 2022 USD ($) | Sep. 30, 2023 USD ($) item | Sep. 30, 2022 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2019 USD ($) | Jan. 31, 2023 USD ($)
ASSET RETIREMENT OBLIGATION: |  |  |  |  |  |  |
Asset retirement obligation, increase (decrease) in asset due to revision in estimate |  |  |  |  | $ (43.3) |  |
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 activity |  |  |  |  |  |  |
Balance at the beginning of the year |  | $ 562.9 | $ 585.3 | $ 562.9 | 562.9 |  |
Changes in estimates |  |  |  | 43.3 |  | $ 28.1 |
Closure payments |  |  | (0.3) | (4.9) |  |  |
Accretion expense |  |  | 19.3 | 19.5 |  |  |
Balance at the end of the year |  |  | $ 604.3 | $ 620.8 | 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) |  |
Mexico |  |  |  |  |  |  |
Asset retirement obligation activity |  |  |  |  |  |  |
Changes in estimates |  | $ 43.3 |  |  |  |  |

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