Quarterly Financial Information - Unaudited (Details) - USD ($) $ / shares in Units, $ 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
Quarterly Financial Information Disclosure [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
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
Net income	$ 287.8	$ 14.8	$ 81.9	$ 146.8	$ 271.9	$ 15.0	$ 62.2	$ 118.8	$ 543.2	$ 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