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Shareholders' Equity - Reclassification out of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other income (expense) $ (0.1) $ (0.6) $ 0.5 $ (0.5)
Discontinued operations 0.7 (1.2) 0.3 (3.2)
Net loss attributable to GlassBridge Enterprises, Inc. (1.3) (5.1) (3.0) (12.9)
Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net loss attributable to GlassBridge Enterprises, Inc. 0.2 0.1 0.0 0.2
Amortization of net actuarial loss | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other income (expense) 0.1 0.1 0.2 0.2
Cumulative translation adjustment | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Discontinued operations $ 0.1 $ 0.0 $ (0.2) $ 0.0