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STOCKHOLDERS' EQUITY: (Details 2) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 5 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended 41 Months Ended
Oct. 31, 2011
Sep. 30, 2011
Aug. 31, 2011
Jul. 31, 2011
Jun. 30, 2011
May 31, 2011
Dec. 31, 2008
Oct. 14, 2010
Sep. 30, 2009
Dec. 31, 2011
Dec. 31, 2008
Dec. 31, 2011
Oct. 21, 2011
SCC share repurchase program:                          
Amount authorized for share repurchase program       $ 1,000             $ 500    
Total number of Shares Purchased 620,000 1,069,669 2,762,811   4,567,520 14,400 28,510,150 15,600 4,912,000 9,034,400   42,472,150  
Average Price Paid per Share $ 24.73 $ 26.59 $ 29.63   $ 32.30 $ 37.06 $ 13.49 $ 29.69 $ 14.64 $ 30.29   $ 17.20  
Total Number of Shares Purchased as Part of Publicly Announced Plan   41,852,150 40,782,481   38,019,670 33,452,150 28,510,150 33,437,750 33,422,150   28,510,150   42,472,150
Maximum Number of Shares that may yet be Purchased Under the Plan @ $30.18                   8,922,746   8,922,746  
Share purchase price under the plan (in dollars per share)                   $ 30.18   $ 30.18  
Total cost $ 15.3 $ 28.4 $ 81.9   $ 147.5 $ 0.5 $ 384.7 $ 0.5 $ 71.9 $ 273.7   $ 730.7