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
	May 05, 2018	Apr. 29, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from the calculation of earnings per share (shares)	7.3	7.0
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)	0.5	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)	6.8	6.7