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STOCKHOLDERS' EQUITY: - Treasury Stock (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Activity in treasury stock        
Balance at the beginning of the period   $ 3,063.5    
Used for corporate purposes $ (0.1) (0.1)    
Balance at the end of the period $ 3,075.8 $ 3,075.8 $ 3,041.5  
Southern Copper common shares        
Activity in treasury stock        
Treasury stock balance at the end of the period (in shares) 111,514,817 111,514,817   111,522,817
TREASURY STOCK: | Southern Copper common shares        
Activity in treasury stock        
Balance at the beginning of the period   $ 2,767.5 2,767.9  
Used for corporate purposes   (0.1)    
Balance at the end of the period $ 2,767.4 2,767.4 2,767.9  
TREASURY STOCK: | Parent Company (Grupo Mexico) common shares        
Activity in treasury stock        
Balance at the beginning of the period   296.0 281.0  
Other activity, including dividend, interest and foreign currency transaction effect   12.4 (7.4)  
Balance at the end of the period $ 308.4 $ 308.4 $ 273.6  
Treasury stock balance at the end of the period (in shares) 85,548,509 85,548,509   87,598,097