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INCOME TAXES: (Tables) | 6 Months Ended
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Jun. 30, 2019
Schedule of income tax provision and effective income tax rate | ​ The income tax provision and the effective income tax rate for the first six months of 2019 and 2018 consisted of ($ in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018 | ​
Statutory income tax provision | ​ | $ | 429.1 | ​ | $ | 473.3 | ​
GILTI Tax | ​ | ​ | — | ​ | ​ | 8.4 | ​
Peruvian royalty | ​ |  | 6.5 | ​ |  | 4.4 | ​
Mexican royalty | ​ |  | 35.2 | ​ |  | 45.0 | ​
Peruvian special mining tax | ​ |  | 18.2 | ​ |  | 14.6 | ​
Total income tax provision | ​ | $ | 489.0 | ​ | $ | 545.7 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Effective income tax rate | ​ | ​ | 38.1 | % | ​ | 38.3 | %

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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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