Revenue Recognition (Deferred Revenue) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Feb. 01, 2020	Feb. 02, 2019	Feb. 01, 2020	Feb. 02, 2019	Aug. 03, 2019	Aug. 04, 2018	[1]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Deferred Revenue, Revenue Recognized, gift cards, gift certificates, merch credits	$ 20.0	$ 19.0	$ 32.0	$ 29.0
Deferred revenue, gift cards, gift certificates, merchandise credits	92.0	92.7	92.0	92.7	$ 79.7	$ 72.4
Deferred Revenue, customer loyalty programs	24.5	25.3	24.5	25.3	$ 22.1	$ 26.3
Deferred Revenue, Revenue Recognized, customer loyalty programs	10.0	20.0	22.0	25.0
Discontinued Operations, Disposed of by Sale
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Deferred Revenue, Revenue Recognized, gift cards, gift certificates, merch credits	5.0	5.0	6.0	9.0
Deferred Revenue, Revenue Recognized, customer loyalty programs	$ 0.0	$ 7.0	$ 5.0	$ 8.0

[1] After adjusting for the impact of adopting ASU 2014-09.