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STOCKHOLDERS' EQUITY: - Treasury Stock (Details) - USD ($) $ in Millions | 3 Months Ended | 147 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Dec. 31, 2019
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 | $ 3,034.2 | $ 3,026.0 | $ 3,034.2 |
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 |
TREASURY STOCK: | Southern Copper common shares |  |  |  |
Activity in treasury stock |  |  |  |
Balance at the beginning of the period | $ 2,767.9 | 2,768.3 |  |
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 | 281.0 | 251.3 |  |
Other activity, including dividend, interest and foreign currency transaction effect | (14.7) | 6.4 |  |
Balance at the end of the period | $ 266.3 | $ 257.7 | $ 266.3 |
Treasury stock balance at the end of the period (in shares) | 93,067,011 |  | 93,067,011 | 93,082,532

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