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INCOME TAXES: (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Income Taxes |  |
Statutory income tax provision | $ 207.4 | $ 214.7
Peruvian royalty | 2.0 | 0.4
Mexican royalty | 8.1 | 16.7
Peruvian special mining tax | 4.2 | 6.1
Total provision for income taxes | $ 221.7 | $ 237.9
Effective income tax rate (as a percent) | 50.80% | 38.10%
Peru |  |
Income Taxes |  |
Peruvian royalty | $ 2.0 | $ 0.4
Royalty charges | 9.3 | 6.0
Accrued special mining tax | 4.2 | 6.1
Mexico |  |
Income Taxes |  |
Mexican royalty | $ 8.1 | $ 16.7

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