Pension Plans - Components of UK Net Asset Recognized (Details) - USD ($) $ in Millions	Jan. 28, 2017	Jan. 30, 2016
Defined Benefit Plan Disclosure [Line Items]
Non-current assets	$ 31.9	$ 51.3
Foreign Pension Plan, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Non-current assets	31.9	51.3
Non-current liabilities	0.0	0.0
Net asset recognized	$ 31.9	$ 51.3