Condensed Consolidated Statements of Comprehensive (Income) Loss - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss) including noncontrolling interest	$ 6.0	$ (7.1)	$ (10.4)	$ (103.8)
Net pension adjustments, net of tax:
Liability adjustments for defined benefit pension plans	(0.8)	0.3	(0.8)	(1.8)
Reclassification of adjustment for defined benefit plans recorded in net income (loss)	0.9	0.5	1.1	3.0
Total net pension adjustments	0.1	0.8	0.3	1.2
Net foreign currency translation:
Unrealized foreign currency translation gains (losses)	0.1	0.0	0.1	(0.8)
Realized cumulative translation adjustments from disposal of businesses	0.0	0.0	0.0	75.8
Total net foreign currency translation	0.1	0.0	0.1	75.0
Total other comprehensive income, net of tax	0.2	0.8	0.4	76.2
Comprehensive income (loss) including noncontrolling interest	6.2	(6.3)	(10.0)	(27.6)
Less: Comprehensive loss attributable to noncontrolling interest	(2.0)	0.0	(5.5)	0.0
Comprehensive income (loss) attributable to GlassBridge Enterprises, Inc.	$ 8.2	$ (6.3)	$ (4.5)	$ (27.6)