Leases - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Leases [Abstract]
Operating lease costs	$ 2.2	$ 2.4	$ 6.8	$ 7.1
Short-term operating lease costs	0.1		0.3
Cash paid for amounts included in the measurement of operating lease liabilities	2.4	2.4	7.2	7.1
Operating lease liabilities arising from obtaining operating right of-use assets	$ 0.2	$ 0.7	$ 0.8	$ 4.4