Leases - Lease Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Leases [Abstract]
Operating lease cost	$ 11.3	$ 10.9
Short-term lease cost	3.8	3.5
Variable lease cost	0.1	0.1
Sublease income	(1.2)	(1.0)
Total lease cost	14.0	13.5	$ 14.8
Operating cash flow payments from operating leases	12.3	11.4
Noncash ROU assets obtained in exchange for lease obligations	$ 9.9	$ 16.5
Weighted-average remaining lease term - operating leases	8 years	8 years 6 months
Weighted-average discount rate - operating leases	4.10%	3.70%