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INCOME TAXES: (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
May 31, 2019
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
INCOME TAXES          
Statutory income tax provision       $ 852.3 $ 649.2
Peruvian royalty       29.1 18.7
Mexican royalty       75.7 72.3
Peruvian special mining tax       45.0 34.7
Total provision for income taxes   $ 578.8 $ 294.5 $ 1,002.1 $ 774.9
Effective income tax rate (as a percent)       37.30% 36.00%
Global minimum tax rate 15.00%        
Peru          
INCOME TAXES          
Royalty charges       $ 74.1 $ 53.4
Income Taxes Paid       72.5  
Increase (Decrease) in Income tax expense (benefit)       10.0  
Unrecognized tax benefits   18.3   18.3  
Mexico          
INCOME TAXES          
Mexican royalty       75.7 $ 72.3
Income Taxes Paid       17.2  
Increase (Decrease) in Income tax expense (benefit)       12.1  
Unrecognized tax benefits   $ 13.2   $ 13.2