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INCOME TAXES: - Other (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) item | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2024 USD ($)
INCOME TAXES |  |  |  |
Total cash, cash equivalents and short-term investments | $ 1,750.8 |  |  |
Deferred tax asset | 204.6 | $ 132.5 |  |
State income tax liability | 0.0 |  |  |
Withholding taxes due to the tax treaty between the United States and Mexico | 0.0 |  |  |
Changes in unrecognized tax benefits |  |  |  |
Unrecognized tax benefits, opening balance | 56.0 |  | $ 66.1 |
Gross decreases - tax positions in prior period |  |  | (10.9) |
Gross increases - tax positions in prior period | 50.2 | 104.2 |  |
Gross increases - current-period tax positions | 8.6 |  |  |
Gross decreases - current-period tax positions |  | (10.7) | (1.1) |
Decreases related to settlements with taxing authorities | (15.7) | (37.5) | (54.1) |
Lapse in statute of Limitations | 10.8 |  |  |
Foreign Currency Effects | 1.1 |  |  |
Increase (decrease) in unrecognized tax benefits | 55.0 | 56.0 | (66.1) |
Unrecognized tax benefits, ending balance | 111.0 | 56.0 |  |
Amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate | $ 99.3 |  |  |
New taxes or tax rate increases | item | 0 |  |  |
Number of major tax jurisdictions | item | 3 |  |  |
Unrecognized Tax Benefits | $ 111.0 | 56.0 |  |
Foreign subsidiaries |  |  |  |
INCOME TAXES |  |  |  |
Total cash, cash equivalents and short-term investments | 512.2 |  |  |
Deferred tax asset | 100.0 |  |  |
Foreign |  |  |  |
Changes in unrecognized tax benefits |  |  |  |
Unrecognized tax benefits, ending balance | 11.7 |  |  |
Unrecognized Tax Benefits | $ 11.7 |  |  |
Peru |  |  |  |
INCOME TAXES |  |  |  |
Royalty charge assessed as a percentage of net sales | 1.00% |  |  |
Royalty charges | $ 84.8 | 71.4 | 140.8 |
Provision for royalty tax | 44.6 | 35.8 | 97.8 |
Peruvian special mining tax | 71.7 | 56.4 | $ 114.0 |
Changes in unrecognized tax benefits |  |  |  |
Unrecognized tax benefits, ending balance | 46.4 |  |  |
Accrued interest and penalties included in liability for uncertain tax positions | 19.7 | 26.7 |  |
Unrecognized Tax Benefits | $ 46.4 |  |  |
Peru | Forecast |  |  |  |
Changes in unrecognized tax benefits |  |  |  |
Income tax expected to be paid |  |  |  | $ 67.8
Peru | Minimum |  |  |  |
INCOME TAXES |  |  |  |
Mining royalty tax (as a percent) | 1.00% |  |  |
Special mine tax (as a percent) | 2.00% |  |  |
Peru | Maximum |  |  |  |
INCOME TAXES |  |  |  |
Mining royalty tax (as a percent) | 12.00% |  |  |
Special mine tax (as a percent) | 8.40% |  |  |
Mexico |  |  |  |
INCOME TAXES |  |  |  |
Mining royalty tax (as a percent) | 7.50% |  |  |
Mining royalty amount | $ 142.8 |  |  |
Additional royalty tax over gross income from sales of gold, silver and platinum (as a percent) | 0.50% |  |  |
Additional royalty over sales revenue from gold, silver and platinum | $ 1.5 |  |  |
Changes in unrecognized tax benefits |  |  |  |
Unrecognized tax benefits, ending balance | 0.0 |  |  |
Accrued interest and penalties included in liability for uncertain tax positions | 0.0 | $ 0.0 |  |
Unrecognized Tax Benefits | 0.0 |  |  |
United States |  |  |  |
Changes in unrecognized tax benefits |  |  |  |
Unrecognized tax benefits, ending balance | 0.2 |  |  |
Accrued interest and penalties included in liability for uncertain tax positions | 0.2 |  |  |
Unrecognized Tax Benefits | $ 0.2 |  |  |

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