Other Income (Expense), Net (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Other Income and Expenses [Abstract]
Unrealized gains (losses) on company owned life insurance contracts and investments held in rabbi trusts	$ 1.5	$ 1.7	$ (0.5)
Interest income	0.3	0.3	0.2
Equity in earnings of unconsolidated subsidiaries	0.0	0.0	0.6
Foreign exchange	(0.6)	(0.4)	(2.4)
Other	0.2	1.2	0.0
Total other income (expense), net	$ 1.4	$ 2.8	$ (2.1)