Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Name:	us-gaap_GoodwillImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Goodwill and intangibles - Summary of Goodwill (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended		12 Months Ended
	Oct. 31, 2020	May 02, 2020	Nov. 02, 2019	Aug. 03, 2019	Oct. 31, 2020	Nov. 02, 2019	Feb. 01, 2020
Goodwill [Roll Forward]
Beginning balance		$ 248.8			$ 248.8
Impairment	$ 0.0		$ 0.0	$ (47.7)	(10.7)	$ (47.7)
Ending balance	238.0		$ 248.8		238.0	248.8	$ 248.8
North America
Goodwill [Roll Forward]
Beginning balance		248.8			248.8	$ 296.6	296.6
Impairment		$ (10.7)			(10.7)		(47.7)
Impact of foreign exchange and other adjustments					(0.1)		(0.1)
Ending balance	$ 238.0				$ 238.0		$ 248.8