Quarterly report pursuant to Section 13 or 15(d)

Stockholders Equity (Details)

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Stockholders Equity (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Class of Stock [Line Items]      
Preferred stock issued (in shares) 0   0
Stock reserved for issuance (in shares) 16,332,563    
Stock authorized for repurchase (in shares) $ 800.0    
Payments for repurchase of common stock 226.6 179.2  
Stock repurchased and retired during the year (in shares) 7,600,000    
Remaining authorized repurchase amount (in shares) $ 284.0    
Series C
      
Class of Stock [Line Items]      
Preferred stock authorized for issuance (in shares) 2,000,000,000