Other Expense, Net - Schedule of Other Expense, Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Other Income and Expenses [Abstract]
Interest income	$ (1.6)	$ (0.2)	$ (3.9)	$ (0.3)
Foreign exchange (gains) losses	(0.5)	1.2	(0.2)	1.5
Unrealized gains on company-owned life insurance contracts and investments held in rabbi trusts	(0.2)	(2.9)	(2.0)	(2.5)
Pension earnings, interest and deferrals	3.9	3.5	7.8	6.9
Other	0.0	0.0	(0.1)	(0.1)
Total other expense, net	$ 1.6	$ 1.6	$ 1.6	$ 5.5