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Stockholders' (Deficit) Equity (Narrative) (Details) - USD ($)
$ in Millions
 1 Months Ended
Feb. 11, 2016
Jan. 30, 2015
Dec. 31, 2015
Treasury Stock Repurchase Programs [Line Items]      
Treasury Stock Shares Repurchased     212,900,000
Additional share repurchase amount authorized $ 611.2 $ 452.9  
Common stock authorized to repurchase 1,000.0 1,000.0  
Remaining common stock available for repurchase $ 388.8 $ 547.1  
Payments for Repurchase of Common Stock     $ 7,500.0
Two Thousand Fourteen Share Buyback Program [Member]      
Treasury Stock Repurchase Programs [Line Items]      
Remaining common stock available for repurchase     $ 454.5