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Subsequent Events (Details) - $ / shares
shares in Millions
3 Months Ended 6 Months Ended
Jul. 21, 2016
Apr. 21, 2016
Jun. 28, 2016
Jun. 30, 2015
Jun. 28, 2016
Jun. 30, 2015
Subsequent events            
Cash dividends declared per common share (in dollars per share)   $ 0.20 $ 0.20 $ 0.165 $ 0.40 $ 0.33
Subsequent event            
Subsequent events            
Cash dividends declared per common share (in dollars per share) $ 0.24          
Treasury Stock            
Subsequent events            
Additional number of shares authorized to repurchase     48.5   48.5  
Treasury Stock | Subsequent event            
Subsequent events            
Additional number of shares authorized to repurchase 7.5          
Number of shares authorized to be repurchased 56.0