Leases - Components of Lease Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Operating lease expense	$ 1.2	$ 1.0	$ 2.4	$ 1.8
Variable lease expense	0.3	0.6	1.7	1.3
Total lease expense	$ 1.5	$ 1.6	$ 4.1	$ 3.1