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INCOME TAXES: - Other (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2019 | Jun. 30, 2018
Income Taxes |  |  |
Peruvian special mining tax |  | $ 18.2 | $ 14.6
Changes in unrecognized tax benefits |  |  |
Unrecognized tax benefits, opening balance |  | 214.5 |
Decreases related to settlements with taxing authorities | $ 145.0 |  |
Unrecognized tax benefits, ending balance | 69.5 | $ 69.5 |
Peru |  |  |
Income Taxes |  |  |
Increment in operating income margin for royalty tax (as a percent) |  | 5.00% |
Increase in royalty tax rate for each 5% increase up to 12% increase in operating income margin (as a percent) |  | 0.75% |
Royalty charges |  | $ 19.8 | $ 15.9
Increment in operating income margin (as a percent) |  | 5.00% |
Increase in special mining tax rate for each 5% increase up to 85% increase in operating income margin (as a percent) |  | 0.40% |
Changes in unrecognized tax benefits |  |  |
Unrecognized tax benefits, ending balance | 0.0 | $ 0.0 |
Peru | Minimum |  |  |
Income Taxes |  |  |
Mining royalty tax (as a percent) |  | 1.00% |
Royalty charge assessed as a percentage of net sales |  | 1.00% |
Special mine tax (as a percent) |  | 2.00% |
Increment in operating income margin (as a percent) |  | 2.00% |
Peru | Maximum |  |  |
Income Taxes |  |  |
Mining royalty tax (as a percent) |  | 12.00% |
Increment in operating income margin for royalty tax (as a percent) |  | 12.00% |
Special mine tax (as a percent) |  | 8.40% |
Operating income margin (as a percent) |  | 10.00% |
Increment in operating income margin (as a percent) |  | 85.00% |
Mexico |  |  |
Income Taxes |  |  |
Mining royalty tax (as a percent) |  | 7.50% |
Changes in unrecognized tax benefits |  |  |
Unrecognized tax benefits, ending balance | $ 0.0 | $ 0.0 |

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