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INCOME TAXES: - Other (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 USD ($) item | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2019 USD ($)
Income Taxes |  |  |  |  |
Total cash, cash equivalents and short-term investments | $ 2,278.0 |  |  |  |
Deferred tax asset | 132.5 | $ 206.1 |  |  |
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 |  | 66.1 | $ 58.4 |  |
Gross decreases - tax positions in prior period |  | (10.9) |  |  |
Gross increases - tax positions in prior period | 130.9 |  |  |  |
Gross decreases - current-period tax positions | (10.7) | (1.1) | (7.7) |  |
Decreases related to settlements with taxing authorities | (37.5) | (54.1) |  |  |
Increase (decrease) in unrecognized tax benefits | 82.7 | (66.1) | 7.7 |  |
Unrecognized tax benefits, ending balance | 82.7 |  | 66.1 |  |
Amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate | $ 65.5 |  |  |  |
Number of major tax jurisdictions | item | 3 |  |  |  |
Foreign subsidiaries |  |  |  |  |
Income Taxes |  |  |  |  |
Total cash, cash equivalents and short-term investments | $ 903.6 |  |  |  |
Deferred tax asset | 300.0 |  |  |  |
Foreign |  |  |  |  |
Changes in unrecognized tax benefits |  |  |  |  |
Unrecognized tax benefits, ending balance | $ 17.2 |  |  |  |
Peru |  |  |  |  |
Income Taxes |  |  |  |  |
Royalty charge assessed as a percentage of net sales | 1.00% |  |  |  |
Royalty charges | $ 71.4 | 140.8 | 60.6 |  |
Provision for royalty tax | 35.8 | 97.8 | 31.4 |  |
Peruvian special mining tax | 56.4 | 114.0 | $ 50.0 |  |
Changes in unrecognized tax benefits |  |  |  |  |
Unrecognized tax benefits, ending balance | 38.8 |  |  |  |
Accrued interest and penalties included in liability for uncertain tax positions | $ 26.7 |  |  |  | $ 26.7
Peru | Forecast |  |  |  |  |
Changes in unrecognized tax benefits |  |  |  |  |
Income tax expected to be paid |  |  |  | $ 24.8 |
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% |  |  |  |
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 |  |  |  |
United States |  |  |  |  |
Changes in unrecognized tax benefits |  |  |  |  |
Accrued interest and penalties included in liability for uncertain tax positions | $ 0.0 | $ 0.0 |  |  |

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