Other Expense, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Other Income and Expenses [Abstract]
Unrealized gains on company-owned life insurance contracts and investments held in rabbi trusts	$ (3.5)	$ (5.8)	$ (3.3)
Interest income	(7.5)	(1.8)	(0.6)
Foreign exchange losses	1.1	1.8	0.4
Pension earnings, interest and deferrals	15.5	14.4	10.0
Pension settlement charge	0.0	51.9	0.0
Other	0.5	0.0	0.0
Total other expense, net	$ 6.1	$ 60.5	$ 6.5