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Subsequent Event (Details) - $ / shares
3 Months Ended 6 Months Ended
Feb. 08, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Subsequent Event [Line Items]          
Dividends declared per common share (in dollars per share)   $ 0.2000 $ 0.1725 $ 0.4000 $ 0.3450
Subsequent Event          
Subsequent Event [Line Items]          
Dividends declared per common share (in dollars per share) $ 0.2