Leases - Schedule of Lease Cost (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Dec. 31, 2019	Dec. 31, 2019
Leases [Abstract]
Amortization of ROU assets	$ 1.3	$ 3.0
Interest on lease liabilities	0.2	0.4
Lease expense	4.0	8.7
Sublease income (gross basis)	(0.3)	(0.4)
Short-term lease expense (including lease term of one month or less)	0.8	2.0
Variable lease expense	2.3	4.5
Total net lease expense	$ 8.3	$ 18.2