Other Income (Expense), Net (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Other Income and Expenses [Abstract]
Unrealized gains on company owned life insurance contracts and investments held in rabbi trusts	$ 0.8	$ 1.5	$ 1.7
Interest income	0.1	0.3	0.3
Foreign exchange	(0.4)	(0.7)	(0.4)
Pension earnings, interest and deferrals	(0.1)	(2.1)	(23.8)
Pension curtailment	0.0	0.0	(0.5)
Other	0.2	0.2	1.2
Total other income (expense), net	$ 0.6	$ (0.8)	$ (21.5)