Consolidated Statements of Operations - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Net revenue	$ 0.1
Operating expenses:
Selling, general and administrative	6.0	6.7
Restructuring and other	0.3
Total operating expenses	6.3	6.7
Operating loss from continuing operations	(6.2)	(6.7)
Other income (expense):
Interest expense	(2.0)	(2.6)
Gain on Chapter 11 reorganization	20.4
Bank Loan forgiveness	0.4
Realized loss on investments		(1.9)
Defined benefit plan adjustment		(8.5)
Other income (expense), net	0.4	0.1
Total other income (expense)	19.2	(12.9)
Income (loss) from continuing operations before income taxes	13.0	(19.6)
Income tax
Income (loss) from continuing operations	13.0	(19.6)
Discontinued operations:
Loss from discontinued operations, net of income taxes	(0.7)	(42.7)
Gain on sale and deconsolidation of discontinued business, net of income taxes	16.7
Loss from discontinued operations, net of income taxes	16.0	(42.7)
Net Income	$ 29.0	$ (62.3)
Earnings (loss) per common share attributable to GlassBridge common shareholders — basic and diluted:
Continuing operations	$ 511.81	$ (782.16)
Discontinued operations	629.92	(1,690.61)
Net Earnings	$ 1,141.73	$ (2,472.77)
Weighted average common shares outstanding:
Basic and diluted (in thousands)	25,400	25,200