Condensed Consolidated Statements of Comprehensive (Income) Loss - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net loss including noncontrolling interest	$ (1.7)	$ (9.3)
Net pension adjustments, net of tax:
Reclassification of adjustment for defined benefit plans recorded in net loss	0.1	0.1
Total net pension adjustments	0.1	0.1
Net foreign currency translation:
Unrealized foreign currency translation gains (losses)	(0.3)	0.0
Total net foreign currency translation	(0.3)	0.0
Total other comprehensive income (loss), net of tax	(0.2)	0.1
Comprehensive loss including noncontrolling interest	(1.9)	(9.2)
Less: Comprehensive loss attributable to noncontrolling interest	0.0	(1.5)
Comprehensive loss attributable to GlassBridge Enterprises, Inc.	$ (1.9)	$ (7.7)