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STOCKHOLDERS' EQUITY: - Treasury Stock (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Activity in treasury stock
Balance at the beginning of the period		$ 3,063.5
Balance at the end of the period	$ 3,048.0	$ 3,080.8	$ 3,048.0
Southern Copper common shares
Activity in treasury stock
Treasury stock balance at the end of the period (in shares)		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	(0.4)	(0.1)	(0.4)
Balance at the end of the period	2,767.5	2,767.4	2,767.5
TREASURY STOCK: | Parent Company 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		17.4	(0.5)
Balance at the end of the period	$ 280.5	$ 313.4	$ 280.5
Treasury stock balance at the end of the period (in shares)		85,841,694		87,598,097

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