Quarterly report pursuant to Section 13 or 15(d)

Stockholders Equity (Details)

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Stockholders Equity (Details) - USD ($)
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Class of Stock [Line Items]      
Preferred stock issued (in shares) 0   0
Stock reserved for issuance (in shares) 12,992,642    
Stock authorized for repurchase (in shares) $ 800,000,000    
Payments for repurchase of common stock $ 64,700,000 $ 226,600,000  
Stock repurchased and retired during the year (in shares) 1,700,000    
Remaining authorized repurchase amount (in shares) $ 117,600,000    
Series C      
Class of Stock [Line Items]      
Preferred stock authorized for issuance (in shares) 2,000,000,000.0