Earnings per common share (“EPS”) - Schedule of Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jul. 29, 2017	Jul. 30, 2016	Jul. 29, 2017	Jul. 30, 2016
Earnings Per Share [Abstract]
Net income attributable to common shareholders	$ 85.2	$ 81.9	$ 155.5	$ 228.7
Dividends on preferred shares	8.2		0.0
Net income	$ 93.4	$ 81.9	$ 155.5	$ 228.7
Basic weighted average number of shares outstanding (shares)	63.8	77.1	65.9	77.8
Dilutive effect of share awards (shares)	0.0	0.1	0.1	0.1
Dilutive effect of preferred shares (shares)	6.7		0.0
Diluted weighted average number of shares outstanding (shares)	70.5	77.2	66.0	77.9
Earnings per share - basic (usd per share)	$ 1.34	$ 1.06	$ 2.36	$ 2.94
Earnings per share - diluted (usd per share)	$ 1.33	$ 1.06	$ 2.36	$ 2.94