Leases - Supplemental Cash Flow Relating to Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Leases [Abstract]
Operating lease payments impacting lease liability	$ 5.9	$ 4.8
Non-cash impact of obtaining new right-of-use assets	$ 0.1	$ 2.6
Weighted-average remaining term (in years)	4 years 3 months 18 days	5 years 8 months 12 days
Weighted-average discount rate	4.60%	4.70%