Other Income, Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Other Income and Expenses [Abstract]
Foreign exchange loss	$ (0.9)	$ (0.2)	$ (0.8)	$ (0.2)
Unrealized gains on company-owned life insurance contracts and investments held in rabbi trusts	0.9	0.3	1.4	0.8
Other	0.2	0.2	0.3	0.4
Total other income, net	$ 0.2	$ 0.3	$ 0.9	$ 1.0