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STOCKHOLDERS' EQUITY: - Treasury Stock (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended | 138 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Jun. 30, 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 | $ 3,032.4 | $ 3,009.1 | $ 3,032.4 | $ 3,009.1 | $ 3,019.6 | $ 3,032.4
Southern Copper common shares |  |  |  |  |  |
Activity in treasury stock |  |  |  |  |  |
Treasury stock balance at the end of the period (in shares) | 111,537,217 | 111,567,617 | 111,537,217 | 111,567,617 |  | 111,537,217
Southern Copper common shares | Directors' Stock Award Plan |  |  |  |  |  |
Share Based Compensation Plan, share distributions |  |  |  |  |  |
Share Based Compensation Plan, share distributions during the period |  |  | 14,400,000,000 |  | 16,000,000,000 |
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 | $ 2,768.7 |
Used for corporate purposes | $ (0.4) | $ (0.4) | (0.4) | (0.4) |  |
Balance at the end of the period | 2,767.9 | 2,768.3 | 2,767.9 | 2,768.3 | 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 | 232.4 |
Other activity, including dividend, interest and foreign currency transaction effect |  |  | 13.2 | 8.4 |  |
Balance at the end of the period | $ 264.5 | $ 240.8 | $ 264.5 | $ 240.8 | $ 251.3 | $ 264.5

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