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INCOME TAXES: (Details)
€ in Millions, $ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2025
EUR (€)
Sep. 30, 2024
USD ($)
Dec. 31, 2024
INCOME TAXES        
Statutory income tax provision $ 1,451.1   $ 1,298.7  
Peruvian royalty 49.9   45.5  
Mexican royalty 151.3   116.3  
Peruvian special mining tax 76.1   68.1  
Total income tax provision $ 1,728.4   $ 1,528.6  
Effective income tax rate (as a percent) 36.40% 36.40% 37.20%  
Threshold minimum aggregate revenue under pillar two tax rules | €   € 750    
Global minimum tax rate 15.00% 15.00%    
Peru        
INCOME TAXES        
Royalty charges $ 126.0   $ 113.6  
Uncertain tax positions 35.4      
Increase (decrease) in income tax expense (benefit) 21.3      
Unrecognized tax benefits 22.1      
Mexico        
INCOME TAXES        
Mexican royalty $ 151.3   $ 116.3  
Mining royalty tax (as a percent) 8.50% 8.50%   7.50%
Additional royalty tax (as a percent) 1.00% 1.00%   0.50%
Uncertain tax positions $ 6.1      
Increase (decrease) in income tax expense (benefit) $ (3.3)