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
	Jan. 28, 2017	Oct. 29, 2016	Jul. 30, 2016	Apr. 30, 2016	Jan. 30, 2016	Oct. 31, 2015	Aug. 01, 2015	May 02, 2015	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Equity [Abstract]
Net income attributable to common shareholders									$ 531.3	$ 467.9	$ 381.3
Add: Dividends on preferred shares									(11.9)	0.0	0.0
Net income	$ 287.8	$ 14.8	$ 81.9	$ 146.8	$ 271.9	$ 15.0	$ 62.2	$ 118.8	$ 543.2	$ 467.9	$ 381.3
Basic weighted average number of common shares outstanding									74.5	79.5	79.9
Dilutive effect of share awards (in shares)									0.1	0.2	0.3
Dilutive effect of preferred shares (in shares)									2.1	0.0	0.0
Diluted weighted average number of common shares outstanding									76.7	79.7	80.2
Earnings per share - basic (usd per share)	$ 4.17	$ 0.20	$ 1.06	$ 1.87	$ 3.43	$ 0.19	$ 0.78	$ 1.49	$ 7.13	$ 5.89	$ 4.77
Earnings per share - diluted (usd per share)	$ 3.92	$ 0.20	$ 1.06	$ 1.87	$ 3.42	$ 0.19	$ 0.78	$ 1.48	$ 7.08	$ 5.87	$ 4.75