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INCOME TAXES: (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Income Taxes |  |  |  |
Statutory income tax provision |  |  | $ 289.1 | $ 175.5
Peruvian royalty |  |  | 0.4 |
Mexican royalty |  |  | 32.3 | 13.7
Peruvian special mining tax |  |  | 14.8 | 5.0
Total income tax provision | $ 160.3 | $ 102.0 | $ 336.6 | $ 194.2
Effective income tax rate (as a percent) |  |  | 35.70% | 32.70%
Changes in the entity's uncertain tax positions |  |  | $ 0.0 |
Peru |  |  |  |
Income Taxes |  |  |  |
Peruvian royalty |  |  | $ 0.4 | $ 0.0
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 |  |  | $ 10.4 | 8.1
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 |  |  | $ 14.8 | 5.0
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 |  |  | $ 32.3 | $ 13.7
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% |
2016 | Peru |  |  |  |
Income Taxes |  |  |  |
Income Tax Rate (as a percent ) |  |  | 28.00% |
Dividend Tax Rate (as a percent ) |  |  | 6.80% |
2017 and later | Peru |  |  |  |
Income Taxes |  |  |  |
Income Tax Rate (as a percent ) |  |  | 29.50% |
Dividend Tax Rate (as a percent ) |  |  | 5.00% |

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