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INCOME TAXES: (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014
Income Taxes |  |  |  |
Statutory income tax provision | $ 82.6 | $ 111.2 |  |
Peruvian royalty |  | 0.5 |  |
Mexican royalty | 9.3 | 13.7 |  |
Peruvian special mining tax | 0.4 | 3.8 |  |
Income tax provision | $ 92.3 | $ 129.2 |  |
Effective income tax rate (as a percent) | 33.80% | 31.50% |  |
Increase in tax rate as effect of forecasted dividends | 1.00% |  |  |
Changes in the entity's uncertain tax positions | $ 0.0 |  |  |
Peru |  |  |  |
Income Taxes |  |  |  |
Peruvian royalty | $ 0.0 |  | $ 0.5 |
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 | $ 4.1 | $ 5.7 |  |
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 | $ 0.4 | 3.8 |  |
Income tax rate ( as a percent) |  |  |  | 30.00%
Dividend tax rate |  |  |  | 4.10%
Peru | Minimum |  |  |  |
Income Taxes |  |  |  |
Mining royalty tax (as a percent) | 1.00% |  |  |
Royalty charge assessed as a percentage of net sales | 1.00% |  |  |
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 | $ 9.3 | $ 13.7 |  |
Mining royalty tax (as a percent) | 7.50% |  |  |
Royalty charges | $ 33.9 |  |  |
Additional royalty tax over net sales from sales of gold, silver and platinum (as a percent) | 0.50% |  |  |
2015 - 2016 |  |  |  |
Income Taxes |  |  |  |
Income tax rate ( as a percent) |  |  | 28.00% |
Dividend tax rate |  |  | 6.80% |
2017 - 2018 |  |  |  |
Income Taxes |  |  |  |
Income tax rate ( as a percent) |  |  | 27.00% |
Dividend tax rate |  |  | 8.00% |
2019 and later |  |  |  |
Income Taxes |  |  |  |
Income tax rate ( as a percent) |  |  | 26.00% |
Dividend tax rate |  |  | 9.30% |

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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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