Supplemental Balance Sheet Information- Allowance for Doubtful Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Trade receivables allowance for doubtful accounts
Beginning balance	$ 6.1	$ 6.0	$ 4.0
Provision for Doubtful Accounts	4.2	3.1	1.7
Allowance for Doubtful Accounts Receivable, Write-offs and Recoveries, net	(0.8)	(3.0)	0.3
Impact of foreign exchange	(0.2)	0.0	0.0
Closing balance	$ 9.3	$ 6.1	$ 6.0