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Subsequent Event - Cash Dividends (Details) - $ / shares
3 Months Ended 9 Months Ended
Apr. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Mar. 31, 2019
Mar. 31, 2018
Subsequent Event [Line Items]                  
Dividends declared per common share (in dollars per share)   $ 0.1518 $ 0.1518 $ 0.1518 $ 0.1320 $ 0.1320 $ 0.1320 $ 0.4554 $ 0.3960
Subsequent Event                  
Subsequent Event [Line Items]                  
Dividends declared per common share (in dollars per share) $ 0.1746