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STOCKHOLDERS' EQUITY: - Repurchase Program (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended | 60 Months Ended | 123 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2008
SCC share repurchase program: |  |  |  |  |  |  |  |
Amount authorized for share repurchase program |  |  |  |  |  | $ 3,000.0 |  | $ 500.0
Total Number of Shares Purchased | 2,937,801 | 36,689,052 | 22,711,428 | 10,245,000 | 46,914,486 | 119,497,767 |  |
Average Price Paid per Share (in dollars per share) | $ 24.42 | $ 27.38 | $ 30.06 | $ 27.47 | $ 18.72 | $ 24.42 |  |
Total Number of Shares Purchased as Part of Publicly Announced Plan |  | 116,559,966 | 79,870,914 | 57,159,486 | 46,914,486 |  |  |
Maximum Number of Shares that May Yet Be Purchased Under the Plan @ $54.189 |  |  |  |  |  | 1,506,706 |  |
Total Cost | $ 71.7 | $ 1,004.4 | $ 682.8 | $ 281.4 | $ 878.1 | $ 2,918.4 |  |
Percentage of ownership by parent |  |  |  |  |  | 88.90% |  |
Parent Company (Grupo Mexico) common shares |  |  |  |  |  |  |  |
Parent Company common shares: |  |  |  |  |  |  |  |
Treasury stock balance at the end of the period (in shares) |  |  |  |  |  | 104,479,600 | 112,457,204 |

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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: 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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