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Stockholders' (Deficit) Equity (Narrative) (Details) - USD ($)
$ in Millions
 1 Months Ended
Feb. 07, 2019
Feb. 08, 2018
Dec. 31, 2018
Treasury Stock Repurchase Programs [Line Items]      
Treasury Stock Shares Repurchased     232,300,000
Additional share repurchase amount authorized $ 602.9 $ 585.8  
Stock Repurchase Program, Authorized Amount 1,000.0 1,000.0  
Remaining common stock available for repurchase $ 397.1 $ 414.2  
Payments for Repurchase of Common Stock     $ 9,420.0
Share Buyback Program [Member]      
Treasury Stock Repurchase Programs [Line Items]      
Remaining common stock available for repurchase     $ 463.2