Related Party Transactions (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
	Aug. 18, 2017	Sep. 30, 2017
Related Party Transaction [Line Items]
Treasury stock (in shares)		574,054
Treasury stock acquired (in dollars per share)		$ 24.35
Treasury stock, value		$ 14.0
Board of Directors Chairman | Purchase Of Treasury Stock
Related Party Transaction [Line Items]
Treasury stock (in shares)	100,000
Treasury stock acquired (in dollars per share)	$ 23.85
Treasury stock, value	$ 2.4