Leases - Lease Cost (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Dec. 31, 2019	Dec. 31, 2019
Leases [Abstract]
Operating lease cost	$ 16.7	$ 33.5
Variable lease cost	0.5	1.1
Short term lease cost	0.1	0.2
Sublease income	(1.6)	(3.5)
Total lease cost	$ 15.7	$ 31.3