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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