Other operating income (loss) - Components of Other Operating Income, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 29, 2022	Jan. 30, 2021	Feb. 01, 2020
Other Income and Expenses [Abstract]
Interest income from customer in-house finance receivables	$ 6.5	$ 4.2	$ 0.0
Shareholder litigation charges, net of insurance recoveries	(1.7)	(7.5)	(33.2)
De-designated cash flow hedges	0.0	9.9	0.0
UK government grants	8.6	0.0	0.0
Other	(4.9)	(4.2)	3.6
Other operating income (loss)	$ 8.5	$ 2.4	$ (29.6)