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STOCKHOLDERS'EQUITY: (Details 2) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 5 Months Ended 6 Months Ended 8 Months Ended 9 Months Ended 12 Months Ended 47 Months Ended
Jun. 30, 2012
May 31, 2012
Apr. 30, 2012
Jul. 31, 2011
Jun. 30, 2012
Dec. 31, 2008
Oct. 14, 2010
Dec. 31, 2011
Sep. 30, 2009
Dec. 31, 2008
Jun. 30, 2012
SCC share repurchase program:                      
Amount authorized for share repurchase program       $ 1,000           $ 500  
Total Number of Shares Purchased 370,000 500,000 278,486   1,148,486 28,510,150 15,600 9,034,400 4,912,000   43,620,636
Average Price Paid per Share $ 28.33 $ 28.57 $ 30.23   $ 28.89 $ 13.49 $ 29.69 $ 30.29 $ 14.64   $ 17.51
Total Number of Shares Purchased as Part of Publicly Announced Plan 43,620,636 43,250,636 42,750,636   43,620,636 28,510,150 33,437,750 42,472,150 33,422,150 28,510,150 43,620,636
Maximum Number of Shares that may yet be Purchased Under the Plan @ $31.51 7,493,007       7,493,007           7,493,007
Share purchase price under the plan (in dollars per share) $ 31.51       $ 31.51           $ 31.51
Total Cost $ 10.5 $ 14.3 $ 8.4   $ 33.2 $ 384.7 $ 0.5 $ 273.7 $ 71.9   $ 764.0
Percentage of ownership interest held by the parent company 81.00%       81.00%           81.00%