Earnings (loss) per common share (“EPS”) - Schedule of Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	May 04, 2019	May 05, 2018
Earnings Per Share [Abstract]
Net income (loss) attributable to common shareholders	$ (18.2)	$ (504.8)
Net income	$ (18.2)	$ (504.8)
Basic weighted average number of shares outstanding (shares)	51.6	59.5
Diluted weighted average number of shares outstanding (shares)	51.6	59.5
Earnings per common share - diluted (usd per share)	$ (0.35)	$ (8.48)