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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jul. 25, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Subsequent Event [Line Items]            
Cash dividends declared per common share (in dollars per share)   $ 0.23 $ 0.22 $ 0.45 $ 0.43 $ 0.44
Subsequent Event            
Subsequent Event [Line Items]            
Cash dividends declared per common share (in dollars per share) $ 0.23          
Dividends $ 10.2