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, 2023	Jun. 30, 2022	Jun. 30, 2021
Income Tax Disclosure [Abstract]
Domestic	$ 51.2	$ (74.0)	$ (252.5)
Foreign	21.3	10.9	(45.4)
Income (loss) before income taxes	$ 72.5	$ (63.1)	$ (297.9)