Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Income Tax Disclosure [Abstract]
Income tax expense	$ 26.6	$ 3.8	$ 63.9	$ 24.8
Income tax benefit as a percent of pre-tax income (loss)	21.80%	37.60%	19.50%	21.10%
Tax expense (benefit) attributable to employee share-based compensation	$ (3.2)		$ (13.0)	$ (4.7)
Goodwill impairment	$ 0.0	$ 14.1	$ 0.0	14.1
Pension settlement expense (benefit)		(12.4)		(12.4)
Prior year income taxes (benefit) charge		$ (1.4)		$ (1.4)
Tax rate excluding discrete items		23.10%