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Discontinued Operations - Financial Results (Details) - Lighting Products - Discontinued Operations, Disposed of by Sale $ in Millions	12 Months Ended
	Jun. 30, 2019 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue, net	$ 419.8
Cost of revenue, net	324.3
Gross profit	95.5
Research and development	37.1
Sales, general and administrative	100.6
Amortization or impairment of acquisition-related intangibles	116.4
Goodwill impairment charges	90.3
Loss on disposal or impairment of long-lived assets	2.0
Loss before income taxes and loss on sale	(250.9)
Loss on sale	66.2
Loss before income taxes	(317.1)
Income tax expense	0.1
Net loss	$ (317.2)

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