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Equity (Details 3) (USD $)
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 31, 2010
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2011
Treasury Stock        
Authorized amount of common stock repurchase (in dollars) $ 200,000,000      
Treasury stock (in shares)     165,288  
Amount of shares repurchased including transaction costs (in dollars)     7,800,000 7,753,000
Average cost of per share repurchased (in dollars per share)     $ 46.91  
Treasury shares cancelled and retired   5,278,828    
Treasury Stock
       
Treasury Stock Activity        
Treasury Stock Retired   200,200,000    
Retained Earnings
       
Treasury Stock Activity        
Reduction due to retirement of treasury stock   200,100,000    
Common Stock
       
Treasury Stock Activity        
Reduction due to retirement of treasury stock   100,000