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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Oct. 12, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Subsequent Event [Line Items]          
Cash dividends declared (in dollars per share)   $ 0.50 $ 0.45 $ 1.50 $ 1.35
Subsequent Event          
Subsequent Event [Line Items]          
Cash dividends declared (in dollars per share) $ 0.5        
Cash dividends declared $ 8.5