Asset impairments, net - Schedule of Asset Impairments, Net (Details) - USD ($) $ in Millions	3 Months Ended
	May 01, 2021	May 02, 2020
Asset Impairment Charges [Abstract]
Goodwill impairment	$ 0.0	$ 10.7
Indefinite-lived intangible asset impairment	0.0	83.3
Property and equipment impairment	1.0	13.8
Operating lease ROU asset impairment	0.5	28.5
Total asset impairments, net	1.5	136.3
Gain on termination or modification of leases	$ 0.2	$ 1.0