Income taxes (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Aug. 04, 2023	Jul. 29, 2022	Aug. 04, 2023	Jul. 29, 2022
Income taxes
Reserves for uncertain tax benefits	$ 11.7		$ 11.7
Interest accrued related to uncertain tax benefits	0.8		0.8
Potential penalties accrued related to uncertain tax benefits	0.0		0.0
Reserves for uncertain tax benefits included in noncurrent Other liabilities	12.5		12.5
Reserve for uncertain tax positions for which a reduction is reasonably possible in the next twelve months	3.1		3.1
Reserve for uncertain tax positions that would impact effective tax rate if recognized	$ 9.6		$ 9.6
Effective income tax rates (as a percent)	22.90%	22.10%	22.30%	22.00%

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount recognized for uncertainty in income taxes classified as noncurrent.

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The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date.

+ References

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Amount of unrecognized tax benefits.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of statutory penalties accrued for a tax position claimed or expected to be claimed by the entity, in its tax return.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 740
-SubTopic 10
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Amount of interest expense accrued for an underpayment of income taxes.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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