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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 90 Months Ended
Apr. 30, 2015
Mar. 31, 2015
Feb. 28, 2015
Jan. 31, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2015
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 1,511,200 4,563,649 2,590,076 5,927,154 1,511,200 13,080,879 22,711,428 10,245,000 46,914,486 94,462,993  
Average Price Paid per Share (in dollars per share) $ 29.42 $ 29.16 $ 29.45 $ 27.12 $ 29.42 $ 29.29 $ 30.06 $ 27.47 $ 18.72 $ 23.89  
Total Number of Shares Purchased as Part of Publicly Announced Plan   92,951,793 88,388,144 85,798,068 94,462,993 92,951,793 79,870,914 57,159,486 46,914,486 94,462,993  
Maximum Number of Shares that May Yet Be Purchased Under the Plan @ $29.41   25,269,210       25,269,210          
Total Cost $ 44.5 $ 133.1 $ 76.3 $ 160.7 $ 44.5 $ 370.1 $ 682.8 $ 281.4 $ 878.1 $ 2,256.9  
Percentage of ownership interest held by the parent company         86.10%         86.10%