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STOCKHOLDERS' EQUITY: - Treasury Stock (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended | 60 Months Ended | 111 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 30, 2016 | Aug. 31, 2016 | Jan. 31, 2016 | Mar. 31, 2017 | Sep. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2017
Activity in treasury stock |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  |  | $ 2,987.6 |  |  |  |  |  |  |  |
Purchase of shares | $ 15.0 | $ 3.0 | $ 53.7 |  | $ 18.0 | $ 53.7 | $ 71.7 | $ 1,004.4 | $ 682.8 | $ 281.4 | $ 878.1 | $ 2,918.4
Balance at the end of the period |  |  |  | $ 2,989.7 |  | $ 2,966.3 | 2,987.6 |  |  |  |  | $ 2,989.7
Southern copper common shares |  |  |  |  |  |  |  |  |  |  |  |
Activity in treasury stock |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock balance at the end of the period (in shares) |  |  |  | 111,579,617 |  | 110,889,016 |  |  |  |  |  | 111,579,617
Parent Company (Grupo Mexico) common shares |  |  |  |  |  |  |  |  |  |  |  |
Activity in treasury stock |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock balance at the end of the period (in shares) |  |  |  | 112,457,204 |  | 118,278,037 |  |  |  |  |  | 112,457,204
TREASURY STOCK: | Southern copper common shares |  |  |  |  |  |  |  |  |  |  |  |
Activity in treasury stock |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  | 2,697.6 | $ 2,769.0 |  | $ 2,697.6 | 2,697.6 |  |  |  |  |
Purchase of shares |  |  |  |  |  | 53.7 |  |  |  |  |  |
Balance at the end of the period |  |  |  | 2,769.0 |  | 2,751.3 | 2,769.0 | 2,697.6 |  |  |  | $ 2,769.0
TREASURY STOCK: | Parent Company (Grupo Mexico) common shares |  |  |  |  |  |  |  |  |  |  |  |
Activity in treasury stock |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period |  |  | $ 211.3 | 218.6 |  | 211.3 | 211.3 |  |  |  |  |
Other activity, including dividend, interest and foreign currency transaction effect |  |  |  | 2.1 |  | 3.7 |  |  |  |  |  |
Balance at the end of the period |  |  |  | $ 220.7 |  | $ 215.0 | $ 218.6 | $ 211.3 |  |  |  | $ 220.7

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- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29,30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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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