Goodwill and intangibles - Composition of Intangible Assets and Liabilities (Details) - USD ($) $ in Millions	Jan. 29, 2022	Jan. 30, 2021
Intangible assets, net:
Definite-lived intangible assets, gross carrying amount	$ 15.8	$ 5.6
Definite-lived intangible assets, accumulated amortization	(5.3)	(4.2)
Net carrying amount	10.5	1.4
Indefinite-lived intangible assets	303.7	177.6
Intangible assets, gross	319.5	183.2
Intangible assets, net	314.2	179.0
Definite-lived intangible liabilities:
Gross carrying amount	(38.0)	(38.0)
Accumulated amortization	30.8	27.5
Total	$ (7.2)	$ (10.5)