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STOCKHOLDERS' EQUITY (Tables) | 3 Months Ended
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Mar. 31, 2020
Share based Compensation Plan |
Schedule of activity in treasury stock | ​ Activity in treasury stock in the three-month period ended March 31, 2020 and 2019 is as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019
Southern Copper common shares | ​ | ​ | ​ | ​ | ​ | ​
Balance as of January 1, | ​ | $ | 2,767.9 | ​ | $ | 2,768.3
Used for corporate purposes | ​ |  | — | ​ |  | —
Balance as of March 31, | ​ |  | 2,767.9 | ​ |  | 2,768.3
​ | ​ | ​ | ​ | ​ | ​ | ​
Parent Company (Grupo Mexico) common shares | ​ | ​ | ​ | ​ | ​ | ​
Balance as of January 1, | ​ |  | 281.0 | ​ |  | 251.3
Other activity, including dividend, interest and foreign currency transaction effect | ​ |  | (14.7) | ​ |  | 6.4
Balance as of March 31, | ​ |  | 266.3 | ​ |  | 257.7
Treasury stock balance as of March 31, | ​ | $ | 3,034.2 | ​ | $ | 3,026.0
Summary of non-controlling interest activity | The following table presents the non-controlling interest activity for the three months ended March 31, 2020 and 2019 (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019
Balance as of January 1, |  | $ | 47.9 |  | $ | 45.4
Net earnings | ​ |  | 1.4 | ​ |  | 1.0
Dividend paid | ​ |  | (2.3) | ​ |  | (0.1)
Balance as of March 31, |  | $ | 47.0 |  | $ | 46.3
Employee Stock Purchase 2015 Plan |
Share based Compensation Plan |
Schedule of stock based compensation expense and unrecognized compensation expense | ​ The stock based compensation expense for the first quarter 2020 and 2019 and the unrecognized compensation expense under this plan were as follows (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019
Stock based compensation expense | ​ | $ | 0.2 | ​ | $ | 0.2
Unrecognized compensation expense | ​ | $ | 1.8 | ​ | $ | 2.4
​
Schedule of stock award activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Unit Weighted Average
​ | ​ | Shares | ​ | Grant Date Fair Value
Outstanding shares at January 1, 2020 |  | 1,379,734 | ​ | $ | 2.63
Granted |  | — | ​ |  | —
Exercised |  | (54,221) | ​ | $ | 2.63
Forfeited |  | — | ​ |  | —
Outstanding shares at March 31, 2020 |  | 1,325,513 | ​ | $ | 2.63
Outstanding shares at January 1, 2019 |  | 1,840,336 | ​ | $ | 2.63
Granted |  | — | ​ |  | —
Exercised |  | (247,670) | ​ | $ | 2.63
Forfeited |  | — | ​ |  | —
Outstanding shares at March 31, 2019 |  | 1,592,666 | ​ | $ | 2.63
​
Employee Stock Purchase 2018 Plan |
Share based Compensation Plan |
Schedule of stock based compensation expense and unrecognized compensation expense | ​ The stock based compensation expense for the three months ended March 31, 2020 and 2019 and the unrecognized compensation expense under this plan were as follows (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 | ​ | 2019
Stock based compensation expense | ​ | $ | 0.2 |  | $ | 0.1
Unrecognized compensation expense | ​ | $ | 4.3 |  | $ | 3.5
​
Schedule of stock award activity | ​

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