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INCOME TAXES: (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Income Taxes |  |  |  |
Statutory income tax provision |  |  | $ 956.4 | $ 406.8
Peruvian royalty |  |  | 38.9 | 4.3
Mexican royalty |  |  | 107.9 | 21.4
Peruvian special mining tax |  |  | 52.0 | 13.7
Total income tax provision | $ 647.7 | $ 224.4 | $ 1,155.2 | $ 446.2
Effective income tax rate (as a percent) |  |  | 40.60% | 48.20%
Peru |  |  |  |
Income Taxes |  |  |  |
Peruvian royalty |  |  | $ 38.9 | $ 4.3
Royalty charges |  |  | 65.4 | 16.7
Accrued special mining tax |  |  | 52.0 | 13.7
Mexico |  |  |  |
Income Taxes |  |  |  |
Mexican royalty |  |  | $ 107.9 | $ 21.4

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