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STOCKHOLDERS' EQUITY: - Treasury Stock (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 60 Months Ended | 105 Months Ended
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2016 | Aug. 31, 2016 | Jan. 31, 2016 | Sep. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2016
Activity in treasury stock |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  | $ 2,908.9 |  | $ 2,908.9 | $ 2,908.9 |  |  |  |  |  |
Purchase of shares | $ 15.0 | $ 3.0 | 53.7 | $ 18.0 | 53.7 |  |  | $ 1,004.4 | $ 682.8 | $ 281.4 | $ 878.1 | $ 2,918.4
Balance at the end of the period | 2,987.0 |  |  | 2,987.0 |  | $ 2,987.0 | $ 2,617.8 | 2,908.9 |  |  |  | 2,987.0
Directors' Stock Award Plan |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Plan, share distributions |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Plan, share distributions during the period |  |  |  |  |  | 12,000 | 13,200 |  |  |  |  |
Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Plan, share distributions |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Plan, share distributions during the period |  |  |  |  |  | 900,000 | 4,300,000 |  |  |  |  |
Treasury Stock: | Southern copper common shares |  |  |  |  |  |  |  |  |  |  |  |
Activity in treasury stock |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  | 2,697.6 |  | 2,697.6 | $ 2,697.6 | $ 1,693.5 | 1,693.5 |  |  |  |
Purchase of shares |  |  |  |  |  | 71.7 | 724.4 |  |  |  |  |
Used for corporate purposes |  |  |  |  |  | (0.3) | (0.4) |  |  |  |  |
Balance at the end of the period | $ 2,769.0 |  |  | $ 2,769.0 |  | $ 2,769.0 | $ 2,417.5 | 2,697.6 | 1,693.5 |  |  | $ 2,769.0
Treasury stock balance at the end of the period (in shares) | 111,579,617 |  |  | 111,579,617 |  | 111,579,617 | 98,044,916 |  |  |  |  | 111,579,617
Treasury Stock: | Parent Company (Grupo Mexico) common shares |  |  |  |  |  |  |  |  |  |  |  |
Activity in treasury stock |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  | $ 211.3 |  | $ 211.3 | $ 211.3 | $ 207.2 | 207.2 |  |  |  |
Other activity, including dividend, interest and currency transaction effect |  |  |  |  |  | 6.7 | (6.9) |  |  |  |  |
Balance at the end of the period | $ 218.0 |  |  | $ 218.0 |  | $ 218.0 | $ 200.3 | $ 211.3 | $ 207.2 |  |  | $ 218.0
Treasury stock balance at the end of the period (in shares) | 115,781,665 |  |  | 115,781,665 |  | 115,781,665 | 92,739,076 |  |  |  |  | 115,781,665

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- Definition Equity impact of the value of treasury stock (units) reissued during the period, excluding reissuance of shares (units) held in treasury used to satisfy equity-based compensation obligations exercised by the holders of such rights. Upon reissuance of shares (units) from treasury, either the common or preferred stock (unit) reissued is outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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