Income Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2020	Jun. 30, 2019
Operating Loss Carryforwards [Line Items]
Income tax expense related to Tax Cuts and Jobs Act	$ 18.0
Net operating loss carryforward		$ 63.9	$ 34.4
Net operating losses with limitations on use		169.0	72.3
Research and Development
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards		9.2
Federal
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards		191.1	112.6
Federal | Tax Year 2036
Operating Loss Carryforwards [Line Items]
Net operating loss carryforward		59.3
Federal | Research and Development
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards			7.7
State
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards		99.6	95.8
Foreign
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards		$ 94.2	$ 26.7