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Subsequent Events Subsequent Events (Details) - $ / shares
3 Months Ended
Nov. 09, 2017
Sep. 30, 2017
Sep. 30, 2016
Subsequent Event [Line Items]      
Dividends declared per share   $ 0.31 $ 0.28
Subsequent Event [Member]      
Subsequent Event [Line Items]      
Dividends Payable, Date Declared Nov. 09, 2017    
Dividends declared per share $ 0.31    
Dividends Payable, Date to be Paid Dec. 15, 2017    
Dividends Payable, Date of Record Nov. 30, 2017