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STOCKHOLDERS' EQUITY - Treasury Stock (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Activity in treasury stock |  |  |
Balance at the beginning of the period | $ 3,048.9 |  |
Purchase of shares | 2,900.0 |  |
Balance at the end of the period | $ 3,063.5 | $ 3,048.9 |
Southern Copper common shares |  |  |
Activity in treasury stock |  |  |
Treasury stock balance at the end of the period (in shares) | 111,522,817 | 111,537,217 |
TREASURY STOCK: | Southern Copper common shares |  |  |
Activity in treasury stock |  |  |
Balance at the beginning of the period | $ 2,767.9 | $ 2,768.3 |
Used for corporate purposes | (0.4) | (0.4) | $ (0.4)
Balance at the end of the period | 2,767.5 | 2,767.9 | 2,768.3
TREASURY STOCK: | Parent Company (Grupo Mexico) common shares |  |  |
Activity in treasury stock |  |  |
Balance at the beginning of the period | 281.0 | 251.3 |
Other activity, including dividend, interest and foreign currency transaction effect | 15.0 | 29.7 | 18.9
Balance at the end of the period | $ 296.0 | $ 281.0 | $ 251.3

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