Income Taxes - Schedule of Income Before Income Taxes for the Company's Domestic and Foreign Operations(Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Income Tax Disclosure [Abstract]
Domestic	$ 56.0	$ 17.3	$ 64.3
Foreign	14.2	4.2	24.8
Income before income taxes	$ 70.2	$ 21.5	$ 89.1