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STOCKHOLDERS' EQUITY: - Treasury Stock (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended 60 Months Ended 111 Months Ended
Sep. 30, 2016
Aug. 31, 2016
Jan. 31, 2016
Mar. 31, 2017
Sep. 30, 2016
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 31, 2017
Activity in treasury stock                        
Balance at the beginning of the period       $ 2,987.6                
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       $ 2,989.7   $ 2,966.3 2,987.6         $ 2,989.7
Southern copper common shares                        
Activity in treasury stock                        
Treasury stock balance at the end of the period (in shares)       111,579,617   110,889,016           111,579,617
Parent Company (Grupo Mexico) common shares                        
Activity in treasury stock                        
Treasury stock balance at the end of the period (in shares)       112,457,204   118,278,037           112,457,204
TREASURY STOCK: | Southern copper common shares                        
Activity in treasury stock                        
Balance at the beginning of the period     2,697.6 $ 2,769.0   $ 2,697.6 2,697.6          
Purchase of shares           53.7            
Balance at the end of the period       2,769.0   2,751.3 2,769.0 2,697.6       $ 2,769.0
TREASURY STOCK: | Parent Company (Grupo Mexico) common shares                        
Activity in treasury stock                        
Balance at the beginning of the period     $ 211.3 218.6   211.3 211.3          
Other activity, including dividend, interest and foreign currency transaction effect       2.1   3.7            
Balance at the end of the period       $ 220.7   $ 215.0 $ 218.6 $ 211.3       $ 220.7