Significant Accounting Policies - Foreign Currency Transactions (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Other income (expense), net
Foreign Currency Transactions
Foreign currency transaction and remeasurement gains (losses)	$ 0.7	$ (0.2)	$ 1.3	$ 0.7