Other Expense, Net - Schedule of Other Expense, Net (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Other Income and Expenses [Abstract]
Interest income	$ (2.3)	$ (0.2)
Unrealized (gains) losses on company-owned life insurance contracts and investments held in rabbi trusts	(1.8)	0.4
Foreign exchange losses	0.3	0.3
Pension earnings, interest and deferrals	3.9	3.5
Total other expense, net	$ 0.1	$ 4.0