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Stockholders' (Deficit) Equity (Narrative) (Details) - USD ($)
$ in Millions
 1 Months Ended
Feb. 08, 2018
Feb. 09, 2017
Dec. 31, 2017
Treasury Stock Repurchase Programs [Line Items]      
Treasury Stock Shares Repurchased     227,600,000
Additional share repurchase amount authorized $ 585.8 $ 640.9  
Common stock authorized to repurchase 1,000.0 1,000.0  
Remaining common stock available for repurchase $ 414.2 $ 359.1  
Payments for Repurchase of Common Stock     $ 8,800.0
Share Buyback Program [Member]      
Treasury Stock Repurchase Programs [Line Items]      
Remaining common stock available for repurchase     $ 477.4