Leases - Lease Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Leases [Abstract]
Operating lease cost	$ 10.1	$ 11.0	$ 11.3
Short-term lease cost	5.7	4.4	3.8
Variable lease cost	0.2	0.2	0.1
Sublease income	(0.9)	(1.0)	(1.2)
Total lease cost	15.1	14.6	14.0
Operating cash flow payments from operating leases	10.8	11.6	12.3
Noncash ROU assets obtained in exchange for lease obligations	$ 3.9	$ 4.3	$ 9.9
Weighted-average remaining lease term - operating leases	6 years 9 months 18 days	7 years 4 months 24 days	8 years
Weighted-average discount rate - operating leases	4.50%	4.40%	4.10%