Goodwill and intangibles - Composition of Intangible Assets and Liabilities (Details) - USD ($) $ in Millions	Feb. 01, 2025	Feb. 03, 2024
Intangible assets, net:
Gross carrying amount	$ 11.2	$ 11.2
Accumulated amortization	(8.4)	(7.5)
Net carrying amount	2.8	3.7
Indefinite-lived intangible assets	304.4	399.1
Intangible assets, gross	315.6	410.3
Total intangible assets, net	307.2	402.8
Intangible liabilities, net
Gross carrying amount	(38.0)	(38.0)
Accumulated amortization	36.2	34.4
Total	$ (1.8)	$ (3.6)