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STOCKHOLDERS' EQUITY: - Treasury Stock (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
Activity in treasury stock |  |
Balance at the beginning of the period | $ 3,001.1 |
Balance at the end of the period | $ 3,018.0 | $ 2,996.7
Southern copper common shares |  |
Activity in treasury stock |  |
Treasury stock balance at the end of the period (in shares) | 111,551,617 | 111,567,617
Southern copper common shares | Directors' Stock Award Plan |  |
Share Based Compensation Plan, share distributions |  |
Share Based Compensation Plan, share distributions during the period | 16,000 | 12,000
Parent Company (Grupo Mexico) common shares |  |
Activity in treasury stock |  |
Purchase of shares | $ 2,900.0 |
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 | 1,300,000 | 300,000
TREASURY STOCK: | Southern copper common shares |  |
Activity in treasury stock |  |
Balance at the beginning of the period | $ 2,768.7 | $ 2,769.0
Used for corporate purposes | (0.4) | (0.3)
Balance at the end of the period | 2,768.3 | 2,768.7
TREASURY STOCK: | Parent Company (Grupo Mexico) common shares |  |
Activity in treasury stock |  |
Balance at the beginning of the period | 232.4 | 218.6
Other activity, including dividend, interest and foreign currency transaction effect | 17.3 | 9.4
Balance at the end of the period | $ 249.7 | $ 228.0

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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=84159872&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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