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STOCKHOLDERS' EQUITY: (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended | 60 Months Ended | 99 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 31, 2016 | Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2016
Activity in treasury stock |  |  |  |  |  |  |  |
Balance at the beginning of the period | $ 2,908.9 | $ 2,908.9 |  |  |  |  |  |
Purchase of shares | 53.7 | 53.7 |  | $ 1,004.4 | $ 682.8 | $ 281.4 | $ 878.1 | $ 2,900.4
Balance at the end of the period |  | 2,966.3 | $ 2,267.9 | 2,908.9 |  |  |  | 2,966.3
Treasury Stock: | Southern copper common shares |  |  |  |  |  |  |  |
Activity in treasury stock |  |  |  |  |  |  |  |
Balance at the beginning of the period | 2,697.6 | 2,697.6 | 1,693.5 | 1,693.5 |  |  |  |
Purchase of shares |  | 53.7 | 370.1 |  |  |  |  |
Balance at the end of the period |  | $ 2,751.3 | $ 2,063.6 | 2,697.6 | 1,693.5 |  |  | $ 2,751.3
Treasury stock balance at the end of the period (in shares) |  | 110,889,016 | 85,058,843 |  |  |  |  | 110,889,016
Treasury Stock: | Parent Company (Grupo Mexico) common shares |  |  |  |  |  |  |  |
Activity in treasury stock |  |  |  |  |  |  |  |
Balance at the beginning of the period | $ 211.3 | $ 211.3 | $ 207.2 | 207.2 |  |  |  |
Other activity, including dividend, interest and foreign currency transaction effect |  | 3.7 | (2.9) |  |  |  |  |
Balance at the end of the period |  | $ 215.0 | $ 204.3 | $ 211.3 | $ 207.2 |  |  | $ 215.0
Treasury stock balance at the end of the period (in shares) |  | 118,278,037 | 94,325,311 |  |  |  |  | 118,278,037

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