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STOCKHOLDERS' EQUITY: (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended 60 Months Ended 99 Months Ended
Jan. 31, 2016
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 31, 2016
Activity in treasury stock                
Balance at the beginning of the period $ 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   2,966.3 $ 2,267.9 2,908.9       2,966.3
Treasury Stock: | Southern copper common shares                
Activity in treasury stock                
Balance at the beginning of the period 2,697.6 2,697.6 1,693.5 1,693.5        
Purchase of shares   53.7 370.1          
Balance at the end of the period   $ 2,751.3 $ 2,063.6 2,697.6 1,693.5     $ 2,751.3
Treasury stock balance at the end of the period (in shares)   110,889,016 85,058,843         110,889,016
Treasury Stock: | Parent Company (Grupo Mexico) common shares                
Activity in treasury stock                
Balance at the beginning of the period $ 211.3 $ 211.3 $ 207.2 207.2        
Other activity, including dividend, interest and foreign currency transaction effect   3.7 (2.9)          
Balance at the end of the period   $ 215.0 $ 204.3 $ 211.3 $ 207.2     $ 215.0
Treasury stock balance at the end of the period (in shares)   118,278,037 94,325,311         118,278,037