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STOCKHOLDERS' EQUITY: - Repurchase (Details) - USD ($) $ / shares in Units, $ 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 | Sep. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | 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 | 587,601 | 115,000 | 2,235,200 | 702,601 | 2,235,200 | 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) | $ 25.55 | $ 25.88 | $ 24.05 | $ 25.61 | $ 24.05 | $ 24.42 | $ 27.38 | $ 30.06 | $ 27.47 | $ 18.72 | $ 24.42 |
Total Number of Shares Purchased as Part of Publicly Announced Plan | 119,497,767 | 118,910,166 | 118,795,166 | 119,497,767 |  |  | 116,559,966 | 79,870,914 | 57,159,486 | 46,914,486 |  |
Maximum Number of Shares that May Yet Be Purchased Under the Plan @ $35.89 |  |  |  |  |  |  |  |  |  |  | 2,274,543 |
Total Cost | $ 15.0 | $ 3.0 | $ 53.7 | $ 18.0 | $ 53.7 | $ 71.7 | $ 1,004.4 | $ 682.8 | $ 281.4 | $ 878.1 | $ 2,918.4 |
Percentage of ownership interest held by the parent company |  |  |  |  |  |  |  |  |  |  | 88.90% |
Parent Company (Grupo Mexico) common shares |  |  |  |  |  |  |  |  |  |  |  |
SCC share repurchase program: |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock balance at the end of the period (in shares) |  |  |  |  | 118,278,037 |  |  |  |  |  | 112,457,204 |

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