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INCOME TAXES: (Details 5) PEN in Millions, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 USD ($) | Dec. 31, 2015 PEN | Dec. 31, 2015 USD ($) item | Dec. 31, 2014 PEN | Dec. 31, 2014 USD ($) | Dec. 31, 2013 PEN | Dec. 31, 2013 USD ($)
Income Taxes |  |  |  |  |  |  |
Cash, cash equivalents, restricted cash and short-term investments |  |  | $ 882.2 |  |  |  |
Income tax rate ( as a percent) |  | 35.00% | 35.00% | 35.00% | 35.00% | 35.00% | 35.00%
Changes in unrecognized tax benefits |  |  |  |  |  |  |
Unrecognized tax benefits, opening balance |  |  | $ 319.4 |  | $ 221.2 |  | $ 221.2
Gross increases tax positions in prior period |  |  | 36.3 |  | 55.1 |  |
Gross increases current-period tax positions |  |  | 44.3 |  | 43.1 |  |
Increase (decrease) in unrecognized tax benefits |  |  | 80.6 |  | 98.2 |  |
Unrecognized tax benefits, ending balance |  |  | 400.0 |  | 319.4 |  | $ 221.2
Amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate |  |  | 400.0 |  | 319.4 |  |
Accrued interest and penalties included in liability for uncertain tax positions |  |  | $ 1.9 |  | $ 0.0 |  |
Number of major tax jurisdictions | item |  |  | 3 |  |  |  |
Foreign subsidiaries |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |
Cash, cash equivalents, restricted cash and short-term investments |  |  | $ 22.6 |  |  |  |
Income tax rate ( as a percent) |  | 10.00% | 10.00% |  |  |  |
Foreign |  |  |  |  |  |  |
Changes in unrecognized tax benefits |  |  |  |  |  |  |
Unrecognized tax benefits, ending balance |  |  | $ 393.3 |  |  |  |
Peru |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |
Income tax rate ( as a percent) |  | 28.00% | 28.00% | 30.00% | 30.00% | 30.00% | 30.00%
Increase in special mining tax rate for each 5% increase up to 85% increase in operating income margin (as a percent) |  | 0.40% | 0.40% |  |  |  |
Peruvian special mining tax |  |  | $ 18.1 |  | $ 35.3 |  | $ 25.5
Dividend tax rate |  |  |  | 4.10% | 4.10% |  |
Royalty charge assessed as a percentage of net sales |  | 1.00% | 1.00% |  |  |  |
Increase in royalty tax rate for each 5% increase up to 12% increase in operating income margin (as a percent) |  | 0.75% | 0.75% |  |  |  |
Royalty charges | PEN |  | PEN 22.9 |  | PEN 32.4 |  | PEN 34.8 |
Provision for royalty tax |  |  | $ 2.7 |  | $ 7.5 |  |
Changes in unrecognized tax benefits |  |  |  |  |  |  |
Amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate |  |  | $ 0.0 |  |  |  |
Peru | 2015 - 2016 |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |
Income tax rate ( as a percent) |  | 28.00% | 28.00% |  |  |  |
Dividend tax rate |  | 6.80% | 6.80% |  |  |  |
Peru | 2017 - 2018 |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |
Income tax rate ( as a percent) |  | 27.00% | 27.00% |  |  |  |
Dividend tax rate |  | 8.00% | 8.00% |  |  |  |
Peru | 2019 and later |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |
Income tax rate ( as a percent) |  | 26.00% | 26.00% |  |  |  |
Dividend tax rate |  | 9.30% | 9.30% |  |  |  |
Peru | Minimum |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |
Special mine tax (as a percent) |  | 2.00% | 2.00% |  |  |  |
Operating income margin (as a percent) |  | 2.00% | 2.00% |  |  |  |
Increment in operating income margin (as a percent) |  | 5.00% | 5.00% |  |  |  |
Mining royalty tax (as a percent) |  | 1.00% | 1.00% |  |  |  |
Increment in operating income margin for royalty tax (as a percent) |  | 5.00% | 5.00% |  |  |  |
Peru | Maximum |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |
Special mine tax (as a percent) |  | 8.40% | 8.40% |  |  |  |
Operating income margin (as a percent) |  | 10.00% | 10.00% |  |  |  |
Increment in operating income margin (as a percent) |  | 85.00% | 85.00% |  |  |  |
Mining royalty tax (as a percent) |  | 12.00% | 12.00% |  |  |  |
Increment in operating income margin for royalty tax (as a percent) |  | 10.00% | 10.00% |  |  |  |
United States | Minimum | Minera Mexico |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |
Excess of financial reporting over tax basis for stock in subsidiary |  |  | $ 5,900.0 |  |  |  |
Mexico |  |  |  |  |  |  |
Income Taxes |  |  |  |  |  |  |
Income tax rate ( as a percent) |  | 30.00% | 30.00% | 30.00% | 30.00% | 30.00% | 30.00%
Mining royalty tax (as a percent) |  | 7.50% | 7.50% |  |  |  |
Additional royalty tax over gross income from sales of gold, silver and platinum (as a percent) |  | 0.50% | 0.50% |  |  |  |
Mining royalty amount on earnings before taxes |  |  | $ 49.5 |  |  |  |
Additional royalty over sales revenue from gold, silver and platinum |  |  | 0.8 |  |  |  |
Amount paid for cancellation of the consolidation regime | $ 0.5 |  |  |  |  |  |
Income tax payable due to tax consolidation |  |  | 5.6 |  |  |  |
Changes in unrecognized tax benefits |  |  |  |  |  |  |
Unrecognized tax benefits, ending balance |  |  | $ 0.0 |  |  |  |

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