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, 2020	Jun. 30, 2019	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Domestic	$ 20.9	$ 204.2	$ 140.3
Foreign	(14.8)	11.8	19.9
Income before income taxes	$ 6.1	$ 216.0	$ 160.2