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STOCKHOLDERS' EQUITY: (Details 2) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended 60 Months Ended 99 Months Ended
Jan. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 31, 2016
Dec. 31, 2008
SCC share repurchase program:                
Amount authorized for share repurchase program   $ 3,000.0         $ 3,000.0 $ 500.0
Total Number of Shares Purchased 2,235,200 2,235,200 36,689,052 22,711,428 10,245,000 46,914,486 118,795,166  
Average Price Paid per Share (in dollars per share) $ 24.05 $ 24.05 $ 27.38 $ 30.06 $ 27.47 $ 18.72 $ 24.41  
Total Number of Shares Purchased as Part of Publicly Announced Plan 118,795,166   116,559,966 79,870,914 57,159,486 46,914,486    
Maximum Number of Shares that May Yet Be Purchased Under the Plan @ $27.71   3,595,217         3,595,217  
Total Cost $ 53.7 $ 53.7 $ 1,004.4 $ 682.8 $ 281.4 $ 878.1 $ 2,900.4  
Percentage of ownership interest held by the parent company   88.80%         88.80%