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INCOME TAXES: (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Income Taxes |  |  |  |  |  |
Statutory income tax provision |  |  |  | $ 268.5 | $ 366.8 |
Peruvian royalty |  |  |  |  | 3.0 |
Mexican royalty |  |  |  | 29.4 | 22.8 |
Peruvian special mining tax |  |  |  | 7.5 | 19.0 |
Income tax provision |  | $ 111.2 | $ 125.3 | $ 305.4 | $ 411.6 |
Effective income tax rate (as a percent) |  |  |  | 34.10% | 38.10% |
Decrease in effective income tax rate (as a percent) |  |  |  | (4.00%) |  |
Reduction in Peruvian special mining tax rate (as a percent) |  |  |  | (1.00%) |  |
Decrease in effective income tax rate, foreign tax credits (as a percent) |  |  |  | (3.00%) |  |
Foreign tax credit carryforwards | $ 187.4 |  |  |  |  |
Changes in the entity's uncertain tax positions |  |  |  | $ 0.0 |  |
Peru |  |  |  |  |  |
Income Taxes |  |  |  |  |  |
Peruvian royalty |  |  |  | $ 0.0 |  | $ 3.0
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 |  |  |  | $ 12.2 | $ 18.5 |
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 |  |  |  | $ 7.5 | 19.0 |
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 |  |  |  | $ 29.4 | $ 22.8 |
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% |  |
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 Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for dividend. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 + Details
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