Leases - Lease Cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease cost	$ 40.0	$ 42.3	$ 79.1	$ 86.5
Short-term lease cost	0.3	1.2	0.7	3.9
Variable lease cost	2.2	0.7	4.3	2.0
Total operating lease cost	$ 42.5	$ 44.2	$ 84.1	$ 92.4