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STOCKHOLDERS' EQUITY: - Treasury Stock (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Activity in treasury stock      
Balance at the beginning of the period $ 3,063.5    
Purchase of shares 2,900.0    
Balance at the end of the period $ 3,061.2 $ 3,034.2  
Southern Copper common shares      
Activity in treasury stock      
Treasury stock balance at the end of the period (in shares) 111,522,817   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  
Balance at the end of the period 2,767.5 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 (2.3) (14.7)  
Balance at the end of the period $ 293.7 $ 266.3  
Treasury stock balance at the end of the period (in shares) 85,955,794   87,598,097