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STOCKHOLDERS' EQUITY - Repurchase Program (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended 60 Months Ended 108 Months Ended
Sep. 30, 2016
Aug. 31, 2016
Jan. 31, 2016
Sep. 30, 2016
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 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 587,601 115,000 2,235,200 702,601 2,235,200 2,937,801 36,689,052 22,711,428 10,245,000 46,914,486 119,497,767  
Average Price Paid per Share (in dollars per share) $ 25.55 $ 25.88 $ 24.05 $ 25.61 $ 24.05 $ 24.42 $ 27.38 $ 30.06 $ 27.47 $ 18.72 $ 24.42  
Total Number of Shares Purchased as Part of Publicly Announced Plan 119,497,767 118,910,166 118,795,166 119,497,767     116,559,966 79,870,914 57,159,486 46,914,486    
Maximum Number of Shares that May Yet Be Purchased Under the Plan @ $31.94           2,555,835         2,555,835  
Total Cost $ 15.0 $ 3.0 $ 53.7 $ 18.0 $ 53.7 $ 71.7 $ 1,004.4 $ 682.8 $ 281.4 $ 878.1 $ 2,918.4  
Share purchase price under the plan (in dollars per share)           $ 31.94         $ 31.94  
Percentage of Ownership by Parent           88.90% 88.60%       88.90%