Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Income Tax Disclosure [Abstract]
Income tax expense	$ 3.8	$ 5.4	$ 24.8	$ 5.9
Income tax benefit as a percent of pre-tax income (loss)	37.60%	22.50%	21.10%	24.70%
Goodwill impairment	$ 14.1	$ 0.0	$ 14.1	$ 0.0
Pension settlement charges benefit	12.4		12.4
Prior year income taxes (benefit) charge	$ (1.4)	0.2	$ (1.4)	0.5
Tax rate excluding discrete items	23.10%		21.00%
Discrete tax benefits attributable to anticipated interest		$ 0.2		0.8
Tax benefit attributable to employee share-based compensation			$ 4.7
Discrete tax charges associated with legislative changes				$ 0.6