Interest Expense, Net - Components of Interest 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]
Interest expense on borrowings	$ 11.3	$ 10.8	$ 21.6	$ 20.8
Interest income	(0.6)	(0.6)	(1.2)	(1.2)
Interest expense, net	$ 10.7	$ 10.2	$ 20.4	$ 19.6