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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 31, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Subsequent Event [Line Items]            
Cash dividends declared per common share (in dollars per share)   $ 0.220 $ 0.21 $ 0.430 $ 0.39 $ 0.42
Subsequent Event            
Subsequent Event [Line Items]            
Cash dividends declared per common share (in dollars per share) $ 0.22          
Dividends $ 10.1