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INCOME TAXES: (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Income Taxes        
Statutory income tax provision     $ 985.8 $ 972.7
Peruvian royalty     30.2 24.7
Mexican royalty     102.5 97.9
Peruvian special mining tax     51.7 41.7
Total income tax provision $ 395.3 $ 228.5 $ 1,170.2 $ 1,137.0
Effective income tax rate (as a percent)     36.90% 39.50%
Unrecognized tax benefits $ 25.6   $ 25.6  
Peru        
Income Taxes        
Royalty charges     81.9 $ 66.4
Increase (Decrease) in Income tax expense (benefit)     15.8  
Mexico        
Income Taxes        
Mexican royalty     102.5 $ 97.9
Liability that increased tax expense     $ 26.5