Schedule of Net Revenue, Operating Loss from Continuing Operations and Assets by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Operating income (loss) from continuing operations
Total operating loss	$ (6.2)	$ (6.7)
Interest expense	(2.0)	(2.6)
Gain on Chapter 11 reorganization	20.4
Bank Loan forgiveness	0.4
Realized losses on investments		(1.9)
Defined benefit plan adjustment		(8.5)
Other income (expense), net	0.4	0.1
Income (loss) from continuing operations before income taxes	13.0	(19.6)
Total segment assets	13.2	15.8
Corporate and unallocated	4.0	1.2
Non-current assets of discontinued operations		8.4
Total consolidated assets	17.2	25.4
Segment Reconciling Items [Member]
Operating income (loss) from continuing operations
Total segment operating loss	(2.0)	(5.2)
Corporate and unallocated	(4.2)	(1.5)
Total operating loss	(6.2)	(6.7)
Interest expense	(2.0)	(2.6)
Gain on Chapter 11 reorganization	20.4	(1.9)
Bank Loan forgiveness	0.4	(8.5)
Realized losses on investments		(1.9)
Defined benefit plan adjustment		(8.5)
Other income (expense), net	0.4	0.1
Income (loss) from continuing operations before income taxes	13.0	(19.6)
Asset Management Income [Member]
Operating income (loss) from continuing operations
Total segment assets	13.2	15.8
Asset Management Income [Member] | Segment Reconciling Items [Member]
Operating income (loss) from continuing operations
Total segment operating loss	$ (2.0)	$ (5.2)