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Goodwill and intangibles - Summary of Goodwill (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended	12 Months Ended
	Aug. 03, 2019	Feb. 02, 2019	May 05, 2018	Aug. 03, 2019	Feb. 02, 2019
Goodwill [Roll Forward]
Beginning Balance			$ 821.7	$ 296.6	$ 821.7
Impairment	$ (47.7)	$ (286.7)		(47.7)	(521.2)
Impact of foreign exchange and other adjustments				(0.1)	(3.9)
Ending Balance	248.8	296.6		248.8	296.6
Intangible assets, purchase accounting adjustments					2.6
North America
Goodwill [Roll Forward]
Beginning Balance			818.1	296.6	818.1
Impairment	(47.7)	(208.8)	(308.8)	(47.7)	(517.6)
Impact of foreign exchange and other adjustments				(0.1)	(3.9)
Ending Balance	248.8	296.6		248.8	296.6
Other
Goodwill [Roll Forward]
Beginning Balance			$ 3.6	0.0	3.6
Impairment				0.0	(3.6)
Impact of foreign exchange and other adjustments				0.0	0.0
Ending Balance	$ 0.0	$ 0.0		$ 0.0	$ 0.0

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Amount of increase (decrease) to assets, excluding financial assets and goodwill, lacking physical substance with a finite life for purchase accounting adjustments.

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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.

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