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INCOME TAXES: (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Income Taxes        
Statutory income tax provision     $ 649.2 $ 752.9
Peruvian royalty     18.7 26.5
Mexican royalty     72.3 87.4
Peruvian special mining tax     34.7 41.7
Total income tax provision $ 294.5 $ 296.4 $ 774.9 $ 908.5
Effective income tax rate (as a percent)     36.00% 42.60%
Unrecognized tax benefits $ 26.8   $ 26.8  
Peru        
Income Taxes        
Increase (Decrease) in Income tax expense (benefit)     13.4  
Royalty charges     53.4 $ 68.2
Mexico        
Income Taxes        
Mexican royalty     72.3 $ 87.4
Liability that increased tax expense     $ 13.8