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, 2021	Jun. 30, 2020	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Domestic	$ (252.5)	$ 20.9	$ 204.2
Foreign	(45.4)	(14.8)	11.8
(Loss) income before income taxes	$ (297.9)	$ 6.1	$ 216.0