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INCOME TAXES: (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Income Taxes |  |  |  |  |
Statutory income tax provision |  |  | $ 429.1 | $ 473.3 |
GILTI tax |  |  |  | 8.4 |
Peruvian royalty |  |  | 6.5 | 4.4 |
Mexican royalty |  |  | 35.2 | 45.0 |
Peruvian special mining tax |  |  | 18.2 | 14.6 |
Total income tax provision | $ 251.1 | $ 309.1 | $ 489.0 | $ 545.7 |
Effective income tax rate (as a percent) |  |  | 38.10% | 38.30% |
Decrease in effective income tax rate |  |  | (0.20%) |  |
Effective income tax rate decrease in exchange gain or loss |  |  | (1.20%) |  |
Effective income tax rate increase decrease in peruvian income tax dividend tax and special mining tax |  |  | 1.00% |  |
Unrecognized tax benefits | 69.5 |  | $ 69.5 |  | $ 214.5
Peru |  |  |  |  |
Income Taxes |  |  |  |  |
Peruvian royalty |  |  | $ 6.5 | $ 4.4 |
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 |
Increase in special mining tax rate for each 5% increase up to 85% increase in operating income margin (as a percent) |  |  | 0.40% |  |
Increment in operating income margin (as a percent) |  |  | 5.00% |  |
Accrued special mining tax |  |  | $ 18.2 | 14.6 |
Unrecognized tax benefits | 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% |  |
Operating income margin for royalty tax (as a percent) |  |  | 10.00% |  |
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 |  |  |  |  |
Mexican royalty |  |  | $ 35.2 | $ 45.0 |
Mining royalty tax (as a percent) |  |  | 7.50% |  |
Additional royalty tax over net sales from sales of gold, silver and platinum (as a percent) |  |  | 0.50% |  |
Unrecognized tax benefits | $ 0.0 |  | $ 0.0 |  |

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- Definition Percentage of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to exchange gain or loss. + References No definition available. + Details
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- Definition Percentage of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to peruvian income tax, dividend tax and special mining tax. + References No definition available. + Details
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- Definition Represents the increase in special mining tax rate for each 5 percent increase up to 85 percent increase in the operating income margin. + References No definition available. + Details
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