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STOCKHOLDERS' EQUITY: - Treasury Stock (Details) - USD ($) $ in Millions	3 Months Ended		135 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019
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	$ 3,026.0	$ 3,007.6	$ 3,026.0
Southern Copper common shares
Activity in treasury stock
Treasury stock balance at the end of the period (in shares)	111,551,617	111,567,617	111,551,617
TREASURY STOCK: | Southern Copper common shares
Activity in treasury stock
Balance at the beginning of the period	$ 2,768.3	$ 2,768.7
Balance at the end of the period	2,768.3	2,768.7	$ 2,768.3
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	6.4	6.5
Balance at the end of the period	$ 257.7	$ 238.9	$ 257.7

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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