Leases - Lease Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022
Leases [Abstract]
Operating lease cost	$ 11.0	$ 11.3	$ 10.9
Short-term lease cost	4.4	3.8	3.5
Variable lease cost	0.2	0.1	0.1
Sublease income	(1.0)	(1.2)	(1.0)
Total lease cost	14.6	14.0	13.5
Operating cash flow payments from operating leases	11.6	12.3	11.4
Noncash ROU assets obtained in exchange for lease obligations	$ 4.3	$ 9.9	$ 16.5
Weighted-average remaining lease term - operating leases	7 years 4 months 24 days	8 years	8 years 6 months
Weighted-average discount rate - operating leases	4.40%	4.10%	3.70%