Share-Based Compensation - Summary of Activity of Awards Granted under Share Saving Plan (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Jan. 30, 2016	Jan. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Granted (usd per share)	$ 0.00
Saving Share Plans
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning Balance (shares)	0.2
Granted (shares)	0.1
Exercised (shares)	(0.1)
Lapsed (shares)	0.0
Ending Balance (shares)	0.2	0.2
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Beginning Balance (usd per share)	$ 69.05
Granted (usd per share)	114.67
Exercised (usd per share)	51.17
Lapsed (usd per share)	81.83
Ending Balance (usd per share)	$ 94.07	$ 69.05
Weighted average remaining contractual life	1 year 10 months 24 days	1 year 10 months 24 days
Intrinsic value	$ 4.9	$ 11.0
Shares Exercisable (shares)	0.0	0.0
Weighted Average Exercise Price, Shares Exercisable (usd per share)	$ 0.00	$ 0.00
Intrinsic Value, Shares Exercisable	$ 0.0	$ 0.0