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STOCKHOLDERS' EQUITY: - Treasury Stock (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 60 Months Ended 102 Months Ended
Jan. 31, 2016
Mar. 31, 2016
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jun. 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 53.7 53.7     $ 1,004.4 $ 682.8 $ 281.4 $ 878.1 $ 2,900.4
Balance at the end of the period     $ 2,967.0 $ 2,312.4 2,908.9       2,967.0
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     600,000 200,000          
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     53.7 414.6          
Used for corporate purposes     (0.3) (0.4)          
Balance at the end of the period     $ 2,751.0 $ 2,107.7 2,697.6 1,693.5     $ 2,751.0
Treasury stock balance at the end of the period (in shares)     110,877,016 86,556,843         110,877,016
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 foreign currency transaction effect     4.7 (2.5)          
Balance at the end of the period     $ 216.0 $ 204.7 $ 211.3 $ 207.2     $ 216.0
Treasury stock balance at the end of the period (in shares)     116,923,605 93,837,013         116,923,605