XML 61 R48.htm IDEA: XBRL DOCUMENT v3.8.0.1
STOCKHOLDERS' EQUITY: - Treasury Stock (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended 60 Months Ended 123 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 31, 2018
Activity in treasury stock                
Balance at the beginning of the period $ 3,001.1              
Purchase of shares     $ 71.7 $ 1,004.4 $ 682.8 $ 281.4 $ 878.1 $ 2,918.4
Balance at the end of the period $ 3,007.6 $ 2,989.7           $ 3,007.6
Southern copper common shares                
Activity in treasury stock                
Treasury stock balance at the end of the period (in shares) 111,567,617 111,579,617           111,567,617
Parent Company (Grupo Mexico) common shares                
Activity in treasury stock                
Treasury stock balance at the end of the period (in shares) 104,479,600 112,457,204           104,479,600
TREASURY STOCK: | Southern copper common shares                
Activity in treasury stock                
Balance at the beginning of the period $ 2,768.7 $ 2,769.0            
Balance at the end of the period 2,768.7 2,769.0 2,769.0         $ 2,768.7
TREASURY STOCK: | Parent Company (Grupo Mexico) common shares                
Activity in treasury stock                
Balance at the beginning of the period 232.4 218.6            
Other activity, including dividend, interest and foreign currency transaction effect 6.5 2.1            
Balance at the end of the period $ 238.9 $ 220.7 $ 218.6         $ 238.9