Leases - Right of Use Assets and Operating Lease Liabilities (Details) - USD ($) $ in Millions	9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Jun. 30, 2020
Leases [Abstract]
Cash paid for operating lease liabilities	$ 111.9	$ 186.9
Operating lease ROU assets obtained in exchange for new operating lease liabilities	$ 107.4	$ 142.9
Weighted-average remaining lease term (in years)	6 years		6 years
Weighted-average discount rate	2.10%		2.30%
Current operating lease liability	$ 96.2		$ 95.5