Leases - Lease Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020
Leases [Abstract]
Operating lease cost	$ 10.9	$ 12.4
Short-term lease cost	3.5	2.9
Variable lease cost	0.1	0.2
Sublease income	(1.0)	(0.7)
Total lease cost	13.5	14.8	$ 14.8
Operating cash flow payments from operating leases	11.4	13.1
Non-cash ROU assets obtained in exchange for lease obligations	$ 16.5	$ 2.0
Weighted-average remaining lease term - operating leases	8 years 6 months	8 years 4 months 24 days
Weighted-average discount rate - operating leases	3.70%	4.00%