Other Income (Expense), Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Other Income and Expenses [Abstract]
Unrealized gains (losses) on company-owned life insurance contracts and investments held in rabbi trusts	$ 1.4	$ (2.9)	$ 1.5	$ (1.9)
Foreign exchange (loss) gain	0.0	(0.3)	0.2	0.1
Pension earnings, interest and deferrals	(0.7)	0.0	(1.4)	0.0
Other	0.1	0.0	0.2	0.1
Total other income (expense), net	$ 0.8	$ (3.2)	$ 0.5	$ (1.7)