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Goodwill and intangibles - Summary of Goodwill (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended		12 Months Ended
	Aug. 01, 2020	May 02, 2020	Aug. 03, 2019	Aug. 01, 2020	Aug. 03, 2019	Feb. 01, 2020
Goodwill [Roll Forward]
Beginning balance		$ 248.8		$ 248.8
Impairment	$ 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

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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- Definition

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.

+ References

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Amount of increase (decrease) from foreign currency translation adjustments and purchase accounting adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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