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STOCKHOLDERS' EQUITY: - Treasury Stock (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 60 Months Ended 105 Months Ended
Sep. 30, 2016
Aug. 31, 2016
Jan. 31, 2016
Sep. 30, 2016
Mar. 31, 2016
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2016
Activity in treasury stock                        
Balance at the beginning of the period     $ 2,908.9   $ 2,908.9 $ 2,908.9            
Purchase of shares $ 15.0 $ 3.0 53.7 $ 18.0 53.7     $ 1,004.4 $ 682.8 $ 281.4 $ 878.1 $ 2,918.4
Balance at the end of the period 2,987.0     2,987.0   $ 2,987.0 $ 2,617.8 2,908.9       2,987.0
Directors' Stock Award Plan                        
Share Based Compensation Plan, share distributions                        
Share Based Compensation Plan, share distributions during the period           12,000 13,200          
Employee Stock Purchase Plan                        
Share Based Compensation Plan, share distributions                        
Share Based Compensation Plan, share distributions during the period           900,000 4,300,000          
Treasury Stock: | Southern copper common shares                        
Activity in treasury stock                        
Balance at the beginning of the period     2,697.6   2,697.6 $ 2,697.6 $ 1,693.5 1,693.5        
Purchase of shares           71.7 724.4          
Used for corporate purposes           (0.3) (0.4)          
Balance at the end of the period $ 2,769.0     $ 2,769.0   $ 2,769.0 $ 2,417.5 2,697.6 1,693.5     $ 2,769.0
Treasury stock balance at the end of the period (in shares) 111,579,617     111,579,617   111,579,617 98,044,916         111,579,617
Treasury Stock: | Parent Company (Grupo Mexico) common shares                        
Activity in treasury stock                        
Balance at the beginning of the period     $ 211.3   $ 211.3 $ 211.3 $ 207.2 207.2        
Other activity, including dividend, interest and currency transaction effect           6.7 (6.9)          
Balance at the end of the period $ 218.0     $ 218.0   $ 218.0 $ 200.3 $ 211.3 $ 207.2     $ 218.0
Treasury stock balance at the end of the period (in shares) 115,781,665     115,781,665   115,781,665 92,739,076         115,781,665