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INCOME TAXES: (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Income Taxes            
Statutory income tax provision       $ 268.5 $ 366.8  
Peruvian royalty         3.0  
Mexican royalty       29.4 22.8  
Peruvian special mining tax       7.5 19.0  
Income tax provision   $ 111.2 $ 125.3 $ 305.4 $ 411.6  
Effective income tax rate (as a percent)       34.10% 38.10%  
Decrease in effective income tax rate (as a percent)       (4.00%)    
Reduction in Peruvian special mining tax rate (as a percent)       (1.00%)    
Decrease in effective income tax rate, foreign tax credits (as a percent)       (3.00%)    
Foreign tax credit carryforwards $ 187.4          
Changes in the entity's uncertain tax positions       $ 0.0    
Peru            
Income Taxes            
Peruvian royalty       $ 0.0   $ 3.0
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       $ 12.2 $ 18.5  
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       $ 7.5 19.0  
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       $ 29.4 $ 22.8  
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%    
2015 - 2016            
Income Taxes            
Income tax rate ( as a percent)       28.00%    
Dividend tax rate       6.80%    
2017 - 2018            
Income Taxes            
Income tax rate ( as a percent)       27.00%    
Dividend tax rate       8.00%    
2019 and later            
Income Taxes            
Income tax rate ( as a percent)       26.00%    
Dividend tax rate       9.30%