Earnings (loss) per common share (“EPS”) - Schedule of Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Nov. 03, 2018	Oct. 28, 2017	Nov. 03, 2018	Oct. 28, 2017
Earnings Per Share [Abstract]
Net income (loss) attributable to common shareholders	$ (38.1)	$ (12.1)	$ (574.1)	$ 143.4
Net income	$ (38.1)	$ (12.1)	$ (574.1)	$ 143.4
Basic weighted average number of shares outstanding (shares)	51.5	60.1	55.7	64.0
Plus: Dilutive effect of share awards	0.0	0.0	0.0	0.1
Diluted weighted average number of shares outstanding (shares)	51.5	60.1	55.7	64.1
Earnings per common share - diluted (usd per share)	$ (0.74)	$ (0.20)	$ (10.31)	$ 2.24