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INCOME TAXES: (Tables) | 9 Months Ended
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Sep. 30, 2018
INCOME TAXES: |
Schedule of income tax provision and effective income tax rate | The income tax provision and the effective income tax rate for the nine months of 2018 and 2017 consisted of (in millions):
|  | 2018 |  | 2017 |
Statutory income tax provision |  | $ | 698.5 |  | $ | 473.0 |
GILTI tax |  | 15.2 |  | — |
Peruvian royalty |  | 6.7 |  | 0.5 |
Mexican royalty |  | 60.9 |  | 67.7 |
Peruvian special mining tax |  | 22.3 |  | 15.4 |
Total income tax provision |  | $ | 803.6 |  | $ | 556.6 |
Effective income tax rate |  | 39.2 | % | 35.7 | %

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- Definition Disclosure of the income tax provision attributable to continuing operations and the effective income tax rate. + References No definition available. + Details
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