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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