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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 96 Months Ended
Dec. 31, 2015
Nov. 30, 2015
Oct. 31, 2015
Sep. 30, 2015
Aug. 31, 2015
Jul. 31, 2015
Apr. 30, 2015
Mar. 31, 2015
Feb. 28, 2015
Jan. 31, 2015
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2015
Dec. 31, 2008
SCC share repurchase program:                                        
Amount authorized for share repurchase program $ 3,000.0                   $ 3,000.0       $ 3,000.0       $ 3,000.0 $ 500.0
Total Number of Shares Purchased 4,448,900 4,635,000 1,525,000 3,724,273 6,160,000 1,603,800 1,511,200 4,563,649 2,590,076 5,927,154 10,608,900 11,488,073 1,511,200 13,080,879 36,689,052 22,711,428 10,245,000 46,914,486 116,559,966  
Average Price Paid per Share (in dollars per share) $ 25.61 $ 26.59 $ 28.08 $ 26.69 $ 26.90 $ 27.84 $ 29.42 $ 29.16 $ 29.45 $ 27.12 $ 26.39 $ 26.97 $ 29.42 $ 29.29 $ 27.38 $ 30.06 $ 27.47 $ 18.72 $ 24.42  
Total Number of Shares Purchased as Part of Publicly Announced Plan 116,559,966 112,111,066 107,476,066 105,951,066 102,226,793 96,066,793 94,462,993 92,951,793 88,388,144 85,798,068 116,559,966 105,951,066   92,951,793 116,559,966 79,870,914 57,159,486 46,914,486 116,559,966  
Maximum Number of Shares that May Yet Be Purchased Under the Plan @ $26.12 5,871,706.00                   5,871,706.00       5,871,706.00       5,871,706.00  
Total Cost $ 114.0 $ 123.2 $ 42.8 $ 99.4 $ 165.7 $ 44.7 $ 44.5 $ 133.1 $ 76.3 $ 160.7 $ 280.0 $ 309.8 $ 44.5 $ 370.1 $ 1,004.4 $ 682.8 $ 281.4 $ 878.1 $ 2,846.6  
Percentage of Ownership by Parent 88.60%                   88.60%       88.60% 84.60%     88.60%