Other Expense, Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Other Income and Expenses [Abstract]
Unrealized (losses) gains on company-owned life insurance contracts and investments held in rabbi trusts	$ (2.9)	$ 0.9	$ (1.9)	$ 1.4
Foreign exchange (loss) gain	(0.3)	(0.9)	0.1	(0.8)
Pension earnings, interest and deferrals	0.0	(0.6)	0.0	(1.1)
Other	0.0	0.2	0.1	0.3
Total other expense, net	$ (3.2)	$ (0.4)	$ (1.7)	$ (0.2)