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Severance (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Former CEO
Severance
Severance costs	$ 1.5	$ 1.0	$ 6.3
Executives and other employees
Severance
Costs associated with accelerated vesting of equity awards	$ 0.1	$ 0.1	$ 2.4

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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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Amount of additional cost recognized for award under share-based payment arrangement from occurrence of event accelerating recognition of cost.

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