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STOCKHOLDERS' EQUITY: - Treasury Stock (Details) - USD ($) $ in Millions | 6 Months Ended | 114 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017
Activity in treasury stock |  |  |
Balance at the beginning of the period | $ 2,987.6 |  |
Cost of purchase of shares |  |  | $ 2.9
Balance at the end of the period | $ 2,991.6 | $ 2,967.0 | $ 2,991.6
Southern copper common shares |  |  |
Activity in treasury stock |  |  |
Treasury stock balance at the end of the period (in shares) | 111,568,817 | 110,877,016 | 111,568,817
Southern copper common shares | Directors' Stock Award Plan |  |  |
Share Based Compensation Plan, share distributions |  |  |
Share Based Compensation Plan, share distributions during the period | 10,800 | 12,000 |
Parent Company (Grupo Mexico) common shares |  |  |
Activity in treasury stock |  |  |
Treasury stock balance at the end of the period (in shares) | 111,939,269 | 116,923,605 | 111,939,269
Parent Company (Grupo Mexico) common shares | Employee Stock Purchase Plan |  |  |
Share Based Compensation Plan, share distributions |  |  |
Share Based Compensation Plan, share distributions during the period | 300,000 | 600,000 |
TREASURY STOCK: | Southern copper common shares |  |  |
Activity in treasury stock |  |  |
Balance at the beginning of the period | $ 2,769.0 | $ 2,697.6 |
Cost of purchase of shares |  | 53.7 |
Used for corporate purposes | (0.3) | (0.3) |
Balance at the end of the period | 2,768.7 | 2,751.0 | $ 2,768.7
TREASURY STOCK: | Parent Company (Grupo Mexico) common shares |  |  |
Activity in treasury stock |  |  |
Balance at the beginning of the period | 218.6 | 211.3 |
Other activity, including dividend, interest and foreign currency transaction effect | 4.3 | 4.7 |
Balance at the end of the period | $ 222.9 | $ 216.0 | $ 222.9

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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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