Other Income, Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Other Income and Expenses [Abstract]
Foreign exchange gain (loss)	$ 0.2	$ (0.9)	$ (0.5)	$ (1.0)
Unrealized (losses) gains on company-owned life insurance contracts and investments held in rabbi trusts	(0.4)	0.6	1.1	1.3
Other	0.2	1.3	0.3	1.7
Total other income, net	$ 0.0	$ 1.0	$ 0.9	$ 2.0