Consolidated Income Statements - USD ($) 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. 31, 2015	Nov. 01, 2014	Aug. 02, 2014	May 03, 2014	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Income Statement [Abstract]
Sales	$ 2,269.9	$ 1,186.2	$ 1,373.4	$ 1,578.9	$ 2,392.6	$ 1,216.4	$ 1,410.6	$ 1,530.6					$ 6,408.4	$ 6,550.2	$ 5,736.3
Cost of sales													(4,047.6)	(4,109.8)	(3,662.1)
Gross margin	945.5	350.0	464.9	600.4	1,016.0	367.7	490.8	565.9					2,360.8	2,440.4	2,074.2
Selling, general and administrative expenses													(1,880.2)	(1,987.6)	(1,712.9)
Other operating income, net													282.6	250.9	215.3
Operating income													763.2	703.7	576.6
Interest expense, net													(49.4)	(45.9)	(36.0)
Income before income taxes													713.8	657.8	540.6
Income taxes													(170.6)	(189.9)	(159.3)
Net income	$ 287.8	$ 14.8	$ 81.9	$ 146.8	$ 271.9	$ 15.0	$ 62.2	$ 118.8					543.2	467.9	381.3
Dividends on redeemable convertible preferred shares													(11.9)	0.0	0.0
Net income attributable to common shareholders													$ 531.3	$ 467.9	$ 381.3
Earnings per common share:
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
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Weighted average common shares outstanding: basic (in shares)													74.5	79.5	79.9
Weighted average common shares outstanding: diluted (in shares)													76.7	79.7	80.2
Dividends declared per common share (usd per share)	$ 0.26	$ 0.26	$ 0.26	$ 0.26	$ 0.22	$ 0.22	$ 0.22	$ 0.22	$ 0.18	$ 0.18	$ 0.18	$ 0.18	$ 1.04	$ 0.88	$ 0.72