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STOCKHOLDERS' EQUITY: - Treasury Stock (Details) - USD ($) $ in Millions	9 Months Ended		141 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Dec. 31, 2018
Activity in treasury stock
Balance at the beginning of the period	$ 3,019.6
Purchase of shares			$ 2,900.0
Balance at the end of the period	$ 3,039.9	$ 3,018.0	$ 3,039.9
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	111,551,617
Southern Copper common shares | Directors' Stock Award Plan
Share Based Compensation Plan, share distributions
Share Based Compensation Plan, share distributions during the period	14,400	16,000
Parent Company (Grupo Mexico) common shares | Employee Stock Purchase Plan
Share Based Compensation Plan, share distributions
Share Based Compensation Plan, share distributions during the period	400,000	1,300,000
TREASURY STOCK: | Southern Copper common shares
Activity in treasury stock
Balance at the beginning of the period	$ 2,768.3	$ 2,768.7
Used for corporate purposes	(0.4)	(0.4)
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	251.3	232.4
Other activity, including dividend, interest and foreign currency transaction effect	20.7	17.3
Balance at the end of the period	$ 272.0	$ 249.7	$ 272.0

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