Earnings (loss) per common share ("EPS") - Schedule of Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Jan. 30, 2021	Feb. 01, 2020	Feb. 02, 2019
EPS – basic
Net income (loss) attributable to common shareholders	$ (48.7)	$ 72.6	$ (690.3)
Weighted average common shares outstanding (in shares)	52.0	51.7	54.7
Earnings (loss) per common share: basic (usd per share)	$ (0.94)	$ 1.40	$ (12.62)
EPS – diluted
Numerator for diluted EPS	$ (48.7)	$ 72.6	$ (690.3)
Dilutive effect of share awards (in shares)	0.0	0.1	0.0
Diluted weighted average number of common shares outstanding	52.0	51.8	54.7
Earnings (loss) per common share: diluted (usd per share)	$ (0.94)	$ 1.40	$ (12.62)