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Long-term debt - Schedule of Long-term Debt (Details) - USD ($) $ in Millions	Oct. 28, 2023	Jan. 28, 2023	Oct. 29, 2022
Debt Instrument [Line Items]
Gross debt	$ 147.8	$ 147.7	$ 147.7
Less: Current portion of long-term debt	(147.6)	0.0	0.0
Less: Unamortized debt issuance costs	(0.2)	(0.3)	(0.4)
Long-term debt	0.0	147.4	147.3
Senior unsecured notes due 2024, net of unamortized discount | Senior Unsecured Notes
Debt Instrument [Line Items]
Gross debt	$ 147.8	$ 147.7	$ 147.7

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