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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Oct. 15, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Subsequent Event [Line Items]          
Cash dividends declared (in dollars per share)   $ 0.55 $ 0.50 $ 1.65 $ 1.50
Subsequent Event          
Subsequent Event [Line Items]          
Cash dividends declared (in dollars per share) $ 0.55        
Cash dividends declared $ 9.2