Share-Based Compensation - Summary of Activity of Awards Granted under Share Saving Plan (Details) - Saving Share Plans - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning Balance (shares)	0.2
Granted (shares)	0.2
Exercised (shares)	0.0
Lapsed (shares)	(0.1)
Ending Balance (shares)	0.3	0.2
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Beginning Balance (usd per share)	$ 94.07
Granted (usd per share)	67.24
Exercised (usd per share)	48.78
Lapsed (usd per share)	101.34
Ending Balance (usd per share)	$ 74.30	$ 94.07
Weighted average remaining contractual life	1 year 11 months 24 days	1 year 10 months 24 days
Intrinsic value	$ 3.0	$ 4.9
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