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INCOME TAXES: (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Income Taxes |  |
Statutory income tax provision | $ 214.7 | $ 212.3
Peruvian royalty | 0.4 | 1.7
Mexican royalty | 16.7 | 16.1
Peruvian special mining tax | 6.1 | 6.5
Total income tax provision | $ 237.9 | $ 236.6
Effective income tax rate (as a percent) | 38.10% | 33.60%
Changes in the entity's uncertain tax positions | $ 0.0 |
Peru |  |
Income Taxes |  |
Peruvian royalty | $ 0.4 | $ 1.7
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 | $ 6.0 | 7.1
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 | $ 6.1 | 6.5
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 | $ 16.7 | $ 16.1
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% |
Royalty expense paid | $ 85.9 |

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