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Goodwill and intangibles - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended					9 Months Ended		12 Months Ended
	Nov. 02, 2019	Aug. 03, 2019	Feb. 02, 2019	Nov. 03, 2018	May 05, 2018	Nov. 02, 2019	Nov. 03, 2018	Feb. 02, 2019	Feb. 03, 2018
Finite-Lived Intangible Assets [Line Items]
Goodwill and intangible impairments	$ 0.0		$ 286.7	$ 0.0		$ 47.7	$ 448.7
Impairment		$ 47.7				47.7		$ 521.2
Goodwill	248.8		296.6	$ 509.0		248.8	$ 509.0	296.6	$ 821.7
North America
Finite-Lived Intangible Assets [Line Items]
Goodwill and intangible impairments					$ 448.7
Impairment			208.8		308.8	47.7		517.6
Impairment of intangible assets (excluding goodwill)			74.3		$ 139.9
Goodwill	248.8		296.6			248.8		296.6	818.1
Other
Finite-Lived Intangible Assets [Line Items]
Impairment			3.6			0.0		3.6
Goodwill	0.0		$ 0.0			0.0		$ 0.0	$ 3.6
Zales
Finite-Lived Intangible Assets [Line Items]
Impairment		35.2
R2Net Inc.
Finite-Lived Intangible Assets [Line Items]
Impairment		$ 12.5
Goodwill	$ 77.8					$ 77.8

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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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Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill.

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