Dividends (Details) - $ / shares	3 Months Ended			6 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Dividends Payable [Line Items]
Cash dividends declared on common stock (in dollars per share)	$ 0.185		$ 0.180	$ 0.37	$ 0.36
2016 Q1 Dividend [Member]
Dividends Payable [Line Items]
Dividends payable, date declared				Oct. 20, 2015
Cash dividends declared on common stock (in dollars per share)		$ 0.185
Dividends payable, date of record				Nov. 13, 2015
Dividends payable, date to be paid				Nov. 30, 2015
2015 Annual Dividend [Member]
Dividends Payable [Line Items]
Cash dividends declared on common stock (in dollars per share)				$ 0.74
2016 Annual Dividend [Member]
Dividends Payable [Line Items]
Cash dividends declared on common stock (in dollars per share)				$ 0.74