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
 6 Months Ended 18 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Dec. 31, 2013
Class of Stock [Line Items]        
Preferred stock issued (in shares) 0   0 0
Stock reserved for issuance (in shares) 16,750,362   16,750,362  
Stock authorized for repurchase (in shares)     $ 800.0  
Payments for repurchase of common stock 136.6 81.8    
Stock repurchased and retired during the year (in shares) 4,600,000      
Remaining authorized repurchase amount (in shares) $ 373.8      
Series C
        
Class of Stock [Line Items]        
Preferred stock authorized for issuance (in shares) 2,000,000,000   2,000,000,000