Accrued Expenses and Other Current Liabilities - Components of Warranty Reserve (Details) - USD ($) $ in Millions	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Warranty Reserve [Line Items]
Warranty reserve	$ 25.7	$ 27.0
Included within accrued expenses above	37.2	40.0	$ 41.9	$ 44.9
Warranty reserves
Warranty Reserve [Line Items]
Current liabilities	11.5	13.0
Warranty reserve	25.7	27.0
Included within accrued expenses above	$ 37.2	$ 40.0