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INCOME TAXES: (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Income Taxes |  |  |  |
Statutory income tax provision |  |  | $ 473.3 | $ 289.1
GILTI tax |  |  | 8.4 |
Peruvian royalty |  |  | 4.4 | 0.4
Mexican royalty |  |  | 45.0 | 32.3
Peruvian special mining tax |  |  | 14.6 | 14.8
Total income tax provision | $ 309.1 | $ 160.3 | $ 545.7 | $ 336.6
Effective income tax rate (as a percent) |  |  | 38.30% | 35.70%
Changes in the entity's uncertain tax positions | $ 0.0 |  | $ 0.0 |
Peru |  |  |  |
Income Taxes |  |  |  |
Peruvian royalty |  |  | $ 4.4 | $ 0.4
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 |  |  | $ 15.9 | 10.4
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 |  |  | $ 14.6 | 14.8
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 |  |  | $ 45.0 | $ 32.3
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% |

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- Definition The amount of tax on global intangible low-taxed income (GILTI) + References No definition available. + Details
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- Definition Represents the royalty charge assessed as a percentage of net sales. + 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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