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STOCKHOLDERS' EQUITY (Tables) | 9 Months Ended
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Sep. 30, 2021
Share based Compensation Plan |
Schedule of activity in treasury stock | ​ Activity in treasury stock in the nine-month period ended September 30, 2021 and 2020 is as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2021 |  | 2020
Southern Copper common shares | ​ | ​ | ​ | ​ | ​ | ​
Balance as of January 1, | ​ | $ | 2,767.5 | ​ | $ | 2,767.9
Used for corporate purposes | ​ |  | (0.1) | ​ |  | (0.4)
Balance as of September 30, | ​ |  | 2,767.4 | ​ |  | 2,767.5
​ | ​ | ​ | ​ | ​ | ​ | ​
Parent Company (Grupo Mexico) common shares | ​ | ​ | ​ | ​ | ​ | ​
Balance as of January 1, | ​ |  | 296.0 | ​ |  | 281.0
Other activity, including dividend, interest and foreign currency transaction effect | ​ |  | 17.4 | ​ |  | (0.5)
Balance as of September 30, | ​ |  | 313.4 | ​ |  | 280.5
Treasury stock balance as of September 30, | ​ | $ | 3,080.8 | ​ | $ | 3,048.0
Summary of non-controlling interest activity | The following table presents the non-controlling interest activity for the nine months ended September 30, 2021 and 2020 (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2021 |  | 2020
Balance as of January 1, |  | $ | 51.2 |  | $ | 47.9
Net earnings | ​ |  | 10.6 | ​ |  | 4.9
Dividend paid | ​ |  | (4.4) | ​ |  | (2.8)
Balance as of September 30, |  | $ | 57.4 |  | $ | 50.0
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 nine months of 2021 and 2020 and the unrecognized compensation expense under this plan were as follows (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2021 |  | 2020
Stock based compensation expense | ​ | $ | 0.5 | ​ | $ | 0.5
Unrecognized compensation expense | ​ | $ | 1.0 | ​ | $ | 1.5
​
Schedule of stock award activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Unit Weighted Average
​ | ​ | Shares | ​ | Grant Date Fair Value
Outstanding shares at January 1, 2021 |  | 1,264,410 | ​ | $ | 2.63
Granted |  | — | ​ |  | —
Exercised |  | (381,288) | ​ | $ | 2.63
Forfeited |  | — | ​ |  | —
Outstanding shares at September 30, 2021 |  | 883,122 | ​ | $ | 2.63
Outstanding shares at January 1, 2020 |  | 1,379,734 | ​ | $ | 2.63
Granted |  | — | ​ |  | —
Exercised |  | (54,221) | ​ | $ | 2.63
Forfeited |  | — | ​ |  | —
Outstanding shares at September 30, 2020 |  | 1,325,513 | ​ | $ | 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 nine months ended September 30, 2021 and 2020 and the unrecognized compensation expense under this plan were as follows (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2021 | ​ | 2020
Stock based compensation expense | ​ | $ | 0.5 |  | $ | 0.5
Unrecognized compensation expense | ​ | $ | 3.3 |  | $ | 4.0
​
Schedule of stock award activity | ​
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Unit Weighted Average
​ |  | Shares |  | Grant Date Fair Value
Outstanding shares at January 1, 2021 |  | 3,918,458 | $ | 1.86
Granted |  | — | ​ | —
Exercised |  | (716,449) | $ | 1.86
Forfeited |  | — | ​ | —
Outstanding shares at September 30, 2021 |  | 3,202,009 | $ | 1.86
Outstanding shares at January 1, 2020 | ​ | 4,002,898 | $ | 1.86
Granted | ​ | — | ​ | —
Exercised | ​ | (37,940) | $ | 1.86
Forfeited | ​ | — | ​ | —
Outstanding shares at September 30, 2020 |  | 3,964,958 | $ | 1.86

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