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STOCKHOLDERS' EQUITY - Treasury Stock (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended 60 Months Ended 108 Months Ended
Sep. 30, 2016
Aug. 31, 2016
Jan. 31, 2016
Sep. 30, 2016
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 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 71.7 $ 1,004.4 $ 682.8 $ 281.4 $ 878.1 $ 2,918.4
Balance at the end of the period           $ 2,987.6 $ 2,908.9       $ 2,987.6
Southern copper common shares                      
Activity in treasury stock                      
Treasury stock balance at the end of the period (in shares)           111,579,617 108,653,816       111,579,617
Parent Company (Grupo Mexico) common shares                      
Activity in treasury stock                      
Treasury stock balance at the end of the period (in shares)           115,667,784 110,472,170       115,667,784
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        
Purchase of shares           71.7 1,004.4 682.7      
Used for corporate purposes           (0.3) (0.3) (0.2)      
Balance at the end of the period           2,769.0 2,697.6 1,693.5     $ 2,769.0
TREASURY STOCK: | Parent Company (Grupo Mexico) common shares                      
Activity in treasury stock                      
Balance at the beginning of the period     $ 211.3   $ 211.3 211.3 207.1        
Other activity, including dividend, interest and foreign currency transaction effect           7.3 4.2 1.6      
Balance at the end of the period           $ 218.6 $ 211.3 $ 207.1     $ 218.6