Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net loss including noncontrolling interest	$ (7.1)	$ (5.6)	$ (16.4)	$ (96.7)
Net pension adjustments, net of tax:
Liability adjustments for defined benefit pension plans	0.0	(2.2)	0.0	(2.1)
Reclassification of adjustment for defined benefit plans recorded in net loss	0.1	1.2	0.2	2.5
Total net pension adjustments	0.1	(1.0)	0.2	0.4
Net foreign currency translation:
Unrealized foreign currency translation losses	0.0	0.0	0.0	(0.8)
Realized cumulative translation adjustments from disposal of businesses	0.0	0.1	0.0	75.8
Total net foreign currency translation	0.0	0.1	0.0	75.0
Total other comprehensive income (loss), net of tax	0.1	(0.9)	0.2	75.4
Comprehensive loss including noncontrolling interest	(7.0)	(6.5)	(16.2)	(21.3)
Less: Comprehensive loss attributable to noncontrolling interest	(2.0)	0.0	(3.5)	0.0
Comprehensive loss attributable to GlassBridge Enterprises, Inc.	$ (5.0)	$ (6.5)	$ (12.7)	$ (21.3)