Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Income tax expense	$ 12.5	$ 1.5	$ 21.0	$ 0.5
Income tax benefit as a percent of pre-tax income (loss)	22.60%	19.50%	19.50%	(500.00%)
Discrete tax benefits associated with legislative changes		$ 0.6		$ 0.6
Tax benefit attributable to employee share-based compensation			$ 4.7
Discrete tax benefits attributable to anticipated interest				0.6
Pre-tax loss	$ 55.2	$ 7.7	$ 107.6	$ (0.1)