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INCOME TAXES: - Other (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) item | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Income Taxes |  |  |
Cash, cash equivalents, restricted cash and short-term investments | $ 2,005.8 |  |
Estimated one time transition tax on foreign earnings and profits |  |  | $ 8,900.0
U.S. federal income tax | 0.0 |  |
State income tax | 0.0 |  |
Provisional tax amount |  |  | 181.1
Reduced tax amount from provisional tax amount |  | $ 28.0 |
Finalized transition tax liability |  | 153.1 |
Deferred tax asset | 54.0 | 128.9 |
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 | 214.5 | 214.5 | 304.0
Gross increases - tax positions in prior period | 7.5 |  | 89.5
Gross decreases - current-period tax positions | (4.2) |  |
Decreases related to settlements with taxing authorities | 144.4 |  |
Increase (decrease) in unrecognized tax benefits | (156.1) |  | (89.5)
Unrecognized tax benefits, ending balance | 58.4 | 214.5 | 214.5
Amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate | $ 10.5 |  |
Number of major tax jurisdictions | item | 3 |  |
Minera Mexico |  |  |
Income Taxes |  |  |
Earnings available for dividends to United States |  |  | 555.5
Foreign subsidiaries |  |  |
Income Taxes |  |  |
Cash, cash equivalents, restricted cash and short-term investments | $ 1,106.7 |  |
Deferred tax asset | 400.0 |  |
Foreign |  |  |
Changes in unrecognized tax benefits |  |  |
Unrecognized tax benefits, ending balance | $ 58.4 |  |
Peru |  |  |
Income Taxes |  |  |
Royalty charge assessed as a percentage of net sales | 1.00% |  |
Royalty charges | $ 42.3 | 32.9 | 23.4
Provision for royalty tax | 14.2 | 9.0 | 2.5
Peruvian special mining tax | 38.1 | $ 30.6 | 23.3
Changes in unrecognized tax benefits |  |  |
Accrued interest and penalties included in liability for uncertain tax positions | 10.5 |  |
Income tax expected to be paid | $ 9.8 |  |
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 on earnings before taxes | $ 61.6 |  |
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 |  |
Withholding tax rate on interest | 1.04% | 0.46% |
Reduction in income tax rate (as a percent) |  | 20.00% |
Reduction in value added tax rate (as a percent) |  | 8.00% |
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 |  | $ 1.9 | $ 1.9

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