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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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