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INCOME TAXES: (Details) € in Millions, $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 USD ($) | Sep. 30, 2025 EUR (€) | Sep. 30, 2024 USD ($) | Dec. 31, 2024
INCOME TAXES |  |  |  |
Statutory income tax provision | $ 1,451.1 |  | $ 1,298.7 |
Peruvian royalty | 49.9 |  | 45.5 |
Mexican royalty | 151.3 |  | 116.3 |
Peruvian special mining tax | 76.1 |  | 68.1 |
Total income tax provision | $ 1,728.4 |  | $ 1,528.6 |
Effective income tax rate (as a percent) | 36.40% | 36.40% | 37.20% |
Threshold minimum aggregate revenue under pillar two tax rules | € |  | € 750 |  |
Global minimum tax rate | 15.00% | 15.00% |  |
Peru |  |  |  |
INCOME TAXES |  |  |  |
Royalty charges | $ 126.0 |  | $ 113.6 |
Uncertain tax positions | 35.4 |  |  |
Increase (decrease) in income tax expense (benefit) | 21.3 |  |  |
Unrecognized tax benefits | 22.1 |  |  |
Mexico |  |  |  |
INCOME TAXES |  |  |  |
Mexican royalty | $ 151.3 |  | $ 116.3 |
Mining royalty tax (as a percent) | 8.50% | 8.50% |  | 7.50%
Additional royalty tax (as a percent) | 1.00% | 1.00% |  | 0.50%
Uncertain tax positions | $ 6.1 |  |  |
Increase (decrease) in income tax expense (benefit) | $ (3.3) |  |  |

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