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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jul. 15, 2016
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Subsequent Event [Line Items]          
Cash dividends declared (in dollars per share)   $ 0.45 $ 0.40 $ 0.90 $ 0.80
Subsequent Event          
Subsequent Event [Line Items]          
Cash dividends declared (in dollars per share) $ 0.45        
Cash dividends declared $ 8.1