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Earnings (loss) per common share (“EPS”) - Schedule of Antidilutive Securities Excluded From Computation of Earnings Per Share (Details) - shares
shares in Millions
3 Months Ended 6 Months Ended
Aug. 03, 2019
Aug. 04, 2018
Aug. 03, 2019
Aug. 04, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive shares excluded from the calculation of earnings per share (shares) 8.6 7.1 8.6 7.1
Share awards        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive shares excluded from the calculation of earnings per share (shares) 1.4 0.3 1.4 0.3
Potential impact of preferred shares        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive shares excluded from the calculation of earnings per share (shares) 7.2 6.8 7.2 6.8