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INCOME TAXES: - Other (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) item | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2021 USD ($)
Income Taxes |  |  |  |
Total cash, cash equivalents and short-term investments | $ 2,594.4 |  |  |
Deferred tax asset | 93.1 | $ 54.0 |  |
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 | 58.4 | 214.5 |  |
Gross increases - tax positions in prior period |  | 7.5 |  |
Gross increases - current-period tax positions | 7.7 |  |  |
Gross decreases - current-period tax positions |  | (4.2) |  |
Decreases related to settlements with taxing authorities |  | 144.4 |  |
Increase (decrease) in unrecognized tax benefits | 7.7 | (156.1) |  |
Unrecognized tax benefits, ending balance | 66.1 | 58.4 | $ 214.5 |
Amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate | $ 0.0 |  |  |
Number of major tax jurisdictions | item | 3 |  |  |
Income tax expected to be paid |  |  |  | $ 0.6
Foreign subsidiaries |  |  |  |
Income Taxes |  |  |  |
Total cash, cash equivalents and short-term investments | $ 1,297.3 |  |  |
Deferred tax asset | 200.0 |  |  |
Foreign |  |  |  |
Changes in unrecognized tax benefits |  |  |  |
Unrecognized tax benefits, ending balance | $ 66.1 |  |  |
Peru |  |  |  |
Income Taxes |  |  |  |
Royalty charge assessed as a percentage of net sales | 1.00% |  |  |
Royalty charges | $ 60.6 | 42.3 | 32.9 |
Provision for royalty tax | 31.4 | 14.2 | 9.0 |
Peruvian special mining tax | $ 50.0 | 38.1 | 30.6 |
Changes in unrecognized tax benefits |  |  |  |
Accrued interest and penalties included in liability for uncertain tax positions |  | $ 10.5 | $ 1.9 |
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 on earnings before taxes | $ 60.1 |  |  |
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 | $ 0.9 |  |  |
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 |  |  |

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