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STOCKHOLDERS' EQUITY: (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended 60 Months Ended 96 Months Ended
Dec. 31, 2015
Nov. 30, 2015
Oct. 31, 2015
Sep. 30, 2015
Aug. 31, 2015
Jul. 31, 2015
Apr. 30, 2015
Mar. 31, 2015
Feb. 28, 2015
Jan. 31, 2015
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2015
Activity in treasury stock                                      
Balance at the beginning of the period                   $ 1,900.6       $ 1,900.6 $ 1,900.6        
Purchase of shares $ 114.0 $ 123.2 $ 42.8 $ 99.4 $ 165.7 $ 44.7 $ 44.5 $ 133.1 $ 76.3 160.7 $ 280.0 $ 309.8 $ 44.5 370.1 1,004.4 $ 682.8 $ 281.4 $ 878.1 $ 2,846.6
Balance at the end of the period $ 2,908.9                   $ 2,908.9       $ 2,908.9 $ 1,900.6     $ 2,908.9
Southern copper common shares                                      
Activity in treasury stock                                      
Treasury stock balance at the end of the period (in shares) 108,653,816                   108,653,816       108,653,816 71,977,964     108,653,816
Parent Company (Grupo Mexico) common shares                                      
Activity in treasury stock                                      
Treasury stock balance at the end of the period (in shares) 110,472,170                   110,472,170       110,472,170 89,950,310     110,472,170
TREASURY STOCK: | Southern copper common shares                                      
Activity in treasury stock                                      
Balance at the beginning of the period                   1,693.5       1,693.5 $ 1,693.5 $ 1,011.0      
Purchase of shares                             1,004.4 682.7      
Used for corporate purposes                             (0.3) (0.2)      
Balance at the end of the period $ 2,697.6                   $ 2,697.6       2,697.6 1,693.5 1,011.0   $ 2,697.6
TREASURY STOCK: | Parent Company (Grupo Mexico) common shares                                      
Activity in treasury stock                                      
Balance at the beginning of the period                   $ 207.1       $ 207.1 207.1 205.5      
Other activity, including dividend, interest and foreign currency transaction effect                             4.2 1.6      
Balance at the end of the period $ 211.3                   $ 211.3       $ 211.3 $ 207.1 $ 205.5   $ 211.3