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INCOME TAXES: (Details) - USD ($) $ in Millions |  | 3 Months Ended
--- | --- | ---
May 31, 2019 | Mar. 31, 2024 | Mar. 31, 2023
INCOME TAXES |  |  |
Statutory income tax provision |  | $ 363.1 | $ 399.0
Peruvian royalty |  | 9.9 | 9.8
Mexican royalty |  | 30.6 | 51.7
Peruvian special mining tax |  | 19.8 | 20.0
Total provision for income taxes |  | $ 423.4 | $ 480.5
Effective income tax rate (as a percent) |  | 36.60% | 36.90%
Global minimum tax rate | 15.00% |  |
Peru |  |  |
INCOME TAXES |  |  |
Royalty charges |  | $ 29.7 | $ 29.8
Income Taxes Paid |  | 72.6 |
Increase (Decrease) in Income tax expense (benefit) |  | 3.7 |
Unrecognized tax benefits |  | 15.1 |
Mexico |  |  |
INCOME TAXES |  |  |
Mexican royalty |  | 30.6 | $ 51.7
Income Taxes Paid |  | 13.6 |
Increase (Decrease) in Income tax expense (benefit) |  | 21.4 |
Unrecognized tax benefits |  | $ 19.7 |

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