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Subsequent Events - Cash Dividends (Details) - $ / shares
3 Months Ended
Oct. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Subsequent Event [Line Items]      
Dividends declared per common share (in dollars per share)   $ 0.1518 $ 0.1320
Subsequent Event      
Subsequent Event [Line Items]      
Dividends declared per common share (in dollars per share) $ 0.1518