Income Taxes - Schedule of Provision (Benefit) for Income Taxes from Continuing Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Current:
Federal	$ 22.6	$ (24.5)	$ 4.7
State	3.5	(1.1)	0.4
Foreign	6.7	7.2	4.3
Total current	32.8	(18.4)	9.4
Deferred:
Federal	(66.0)	38.7	0.1
State	4.8	3.5	0.5
Foreign	0.1	(0.6)	0.2
Total deferred	(61.1)	41.6	0.8
Total income tax (benefit) expense	$ (28.3)	$ 23.2	$ 10.2