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STOCKHOLDERS' EQUITY: - Treasury Stock (Details) - USD ($) $ in Millions	3 Months Ended		147 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Dec. 31, 2019
Activity in treasury stock
Balance at the beginning of the period	$ 3,048.9
Purchase of shares			$ 2,900.0
Balance at the end of the period	$ 3,034.2	$ 3,026.0	$ 3,034.2
Southern Copper common shares
Activity in treasury stock
Treasury stock balance at the end of the period (in shares)	111,537,217		111,537,217
TREASURY STOCK: | Southern Copper common shares
Activity in treasury stock
Balance at the beginning of the period	$ 2,767.9	2,768.3
Balance at the end of the period	2,767.9	2,768.3	$ 2,767.9
TREASURY STOCK: | Parent Company (Grupo Mexico) common shares
Activity in treasury stock
Balance at the beginning of the period	281.0	251.3
Other activity, including dividend, interest and foreign currency transaction effect	(14.7)	6.4
Balance at the end of the period	$ 266.3	$ 257.7	$ 266.3
Treasury stock balance at the end of the period (in shares)	93,067,011		93,067,011	93,082,532

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