Dividends (Details) - $ / shares		3 Months Ended		6 Months Ended
	Oct. 17, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Dividends Payable [Line Items]
Cash dividends declared on common stock (in dollars per share)		$ 0.0975	$ 0.0950	$ 0.1950	$ 0.1900
2018 Q1 Dividend [Member]
Dividends Payable [Line Items]
Dividends payable, date declared				Oct. 17, 2017
Cash dividends declared on common stock (in dollars per share)	$ 0.0975
Dividends payable, date of record				Nov. 15, 2017
Dividends payable, date paid				Nov. 30, 2017
2018 Annual Dividend [Member]
Dividends Payable [Line Items]
Cash dividends declared on common stock (in dollars per share)	$ 0.39