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INCOME TAXES: (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Income Taxes          
Statutory income tax provision     $ 429.1 $ 473.3  
GILTI tax       8.4  
Peruvian royalty     6.5 4.4  
Mexican royalty     35.2 45.0  
Peruvian special mining tax     18.2 14.6  
Total income tax provision $ 251.1 $ 309.1 $ 489.0 $ 545.7  
Effective income tax rate (as a percent)     38.10% 38.30%  
Decrease in effective income tax rate     (0.20%)    
Effective income tax rate decrease in exchange gain or loss     (1.20%)    
Effective income tax rate increase decrease in peruvian income tax dividend tax and special mining tax     1.00%    
Unrecognized tax benefits 69.5   $ 69.5   $ 214.5
Peru          
Income Taxes          
Peruvian royalty     $ 6.5 $ 4.4  
Increment in operating income margin for royalty tax (as a percent)     5.00%    
Increase in royalty tax rate for each 5% increase up to 12% increase in operating income margin (as a percent)     0.75%    
Royalty charges     $ 19.8 15.9  
Increase in special mining tax rate for each 5% increase up to 85% increase in operating income margin (as a percent)     0.40%    
Increment in operating income margin (as a percent)     5.00%    
Accrued special mining tax     $ 18.2 14.6  
Unrecognized tax benefits 0.0   $ 0.0    
Peru | Minimum          
Income Taxes          
Mining royalty tax (as a percent)     1.00%    
Royalty charge assessed as a percentage of net sales     1.00%    
Special mine tax (as a percent)     2.00%    
Increment in operating income margin (as a percent)     2.00%    
Peru | Maximum          
Income Taxes          
Mining royalty tax (as a percent)     12.00%    
Operating income margin for royalty tax (as a percent)     10.00%    
Increment in operating income margin for royalty tax (as a percent)     12.00%    
Special mine tax (as a percent)     8.40%    
Operating income margin (as a percent)     10.00%    
Increment in operating income margin (as a percent)     85.00%    
Mexico          
Income Taxes          
Mexican royalty     $ 35.2 $ 45.0  
Mining royalty tax (as a percent)     7.50%    
Additional royalty tax over net sales from sales of gold, silver and platinum (as a percent)     0.50%    
Unrecognized tax benefits $ 0.0   $ 0.0