Earnings Per Common Share - Schedule of Earnings per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Feb. 03, 2018	Oct. 28, 2017	Jul. 29, 2017	Apr. 29, 2017	Jan. 28, 2017	Oct. 29, 2016	Jul. 30, 2016	Apr. 30, 2016	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Equity [Abstract]
Net income attributable to common shareholders									$ 486.4	$ 531.3	$ 467.9
Add: Dividends on preferred shares									(32.9)	(11.9)	0.0
Net income	$ 343.0	$ (12.1)	$ 85.2	$ 70.3	$ 287.8	$ 14.8	$ 81.9	$ 146.8	$ 519.3	$ 543.2	$ 467.9
Basic weighted average number of common shares outstanding									63.0	74.5	79.5
Dilutive effect of share awards (in shares)									0.1	0.1	0.2
Dilutive effect of preferred shares (in shares)									6.7	2.1	0.0
Diluted weighted average number of common shares outstanding									69.8	76.7	79.7
Earnings per share - basic (usd per share)	$ 5.70	$ (0.20)	$ 1.34	$ 1.03	$ 4.17	$ 0.20	$ 1.06	$ 1.87	$ 7.72	$ 7.13	$ 5.89
Earnings per share - diluted (usd per share)	$ 5.24	$ (0.20)	$ 1.33	$ 1.03	$ 3.92	$ 0.20	$ 1.06	$ 1.87	$ 7.44	$ 7.08	$ 5.87