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INCOME TAXES: (Details) - USD ($)
$ in Millions
 3 Months Ended
May 31, 2019
Mar. 31, 2024
Mar. 31, 2023
INCOME TAXES      
Statutory income tax provision   $ 363.1 $ 399.0
Peruvian royalty   9.9 9.8
Mexican royalty   30.6 51.7
Peruvian special mining tax   19.8 20.0
Total provision for income taxes   $ 423.4 $ 480.5
Effective income tax rate (as a percent)   36.60% 36.90%
Global minimum tax rate 15.00%    
Peru      
INCOME TAXES      
Royalty charges   $ 29.7 $ 29.8
Income Taxes Paid   72.6  
Increase (Decrease) in Income tax expense (benefit)   3.7  
Unrecognized tax benefits   15.1  
Mexico      
INCOME TAXES      
Mexican royalty   30.6 $ 51.7
Income Taxes Paid   13.6  
Increase (Decrease) in Income tax expense (benefit)   21.4  
Unrecognized tax benefits   $ 19.7