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INCOME TAXES: (Tables) | 9 Months Ended
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Sep. 30, 2023
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-month periods ended September 30, 2023 and 2022 consisted of (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022 | ​
Statutory income tax provision | ​ | $ | 985.8 | ​ | $ | 972.7 | ​
Peruvian royalty | ​ |  | 30.2 | ​ |  | 24.7 | ​
Mexican royalty | ​ |  | 102.5 | ​ |  | 97.9 | ​
Peruvian special mining tax | ​ |  | 51.7 | ​ |  | 41.7 | ​
Total income tax provision | ​ | $ | 1,170.2 | ​ | $ | 1,137.0 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Effective income tax rate | ​ | ​ | 36.9 | % | ​ | 39.5 | %

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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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- References No definition available. + Details
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