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INCOME TAXES: (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Income Taxes |  |  |  |
Statutory income tax provision |  |  | $ 1,387.0 | $ 694.7
Peruvian royalty |  |  | 70.1 | 14.1
Mexican royalty |  |  | 162.5 | 44.1
Peruvian special mining tax |  |  | 84.2 | 31.8
Total income tax provision | $ 548.6 | $ 338.5 | $ 1,703.8 | $ 784.7
Effective income tax rate (as a percent) |  |  | 40.00% | 44.40%
Peru |  |  |  |
Income Taxes |  |  |  |
Peruvian royalty |  |  | $ 70.1 | $ 14.1
Royalty charges |  |  | 105.6 | 39.7
Accrued special mining tax |  |  | 84.2 | 31.8
Mexico |  |  |  |
Income Taxes |  |  |  |
Mexican royalty |  |  | $ 162.5 | $ 44.1

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