Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
Net revenue
Operating expenses:
Selling, general and administrative	0.8	1.3
Total operating expenses	0.8	1.3
Operating loss from continuing operations	(0.8)	(1.3)
Other income (expense):
Interest expense	(0.1)	(0.9)
Other income (expense), net	0.1
Total other income (expense)		(0.9)
Loss from continuing operations before income taxes	(0.8)	(2.2)
Loss from continuing operations	(0.8)	(2.2)
Net loss from continuing operations	(0.8)	(2.2)
Discontinued Operations:
Loss from discontinued operations, net of income taxes
Loss from discontinued businesses, net of income taxes
Net loss	$ (0.8)	$ (2.2)
Income (loss) per common share — basic and diluted:
Continuing operations	$ (30.30)	$ (87.30)
Discontinued operations	(0.0)	(0.00)
Net loss	$ (30.30)	$ (87.30)
Weighted average common shares outstanding:
Basic and diluted (thousands)	26,400	25,200