Leases - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2020
Leases [Abstract]
Operating lease option to extend, in years			5 years
Weighted average remaining lease term			10 years 2 months 12 days
Weighted average discount rate on operating leases			3.10%
Operating lease expense	$ 49.0	$ 50.4