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Income (Loss) Per Common Share (Tables)
12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Computation of Weighted Average Basic and Diluted Income (Loss) Per Share

The following table sets forth the computation of the weighted average basic and diluted income (loss) per share:

 

    Years Ended December 31,  
    2020     2019  
    (In millions, except per share amounts)  
Numerator:                
Income (loss) from continuing operations   $ (63.6 )   $ 11.4  
Less: loss attributable to noncontrolling interest     (1.3 )      
Net income (loss) from continuing operations attributable to GlassBridge Enterprises, Inc.     (62.3 )     11.4  
Income from discontinued operations, net of income taxes           11.7  
Net income   $ (62.3 )   $ 23.1  
Denominator:                
Weighted average number of diluted shares outstanding during the period - basic and diluted (in thousands)     25.2       25.5  
                 
Income (loss) per common share attributable to GlassBridge common shareholders — basic and diluted:                
Continuing operations   $ (2,472.77 )   $ 330.15  
Discontinued operations           461.45  
Net income   $ (2,472.77 )   $ 791.60  
Anti-dilutive shares excluded from calculation