Other Income (Expense), Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Other Income and Expenses [Abstract]
Unrealized gains on company-owned life insurance contracts and investments held in rabbi trusts	$ 3.1	$ 1.4	$ 4.4	$ 1.5
Foreign exchange (loss) gain	(0.8)	0.0	(3.5)	0.2
Pension earnings, interest and deferrals	(1.0)	(0.7)	(2.0)	(1.4)
Other	0.0	0.1	0.0	0.2
Total other income (expense), net	$ 1.3	$ 0.8	$ (1.1)	$ 0.5