Income taxes - Schedule of Income and Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Feb. 01, 2025	Feb. 03, 2024	Jan. 28, 2023
Income before income taxes:
– US	$ (165.9)	$ 320.5	$ 281.2
– Foreign	290.1	319.3	170.0
Income before income taxes	124.2	639.8	451.2
Current taxation:
– US	64.1	(14.8)	157.1
– Foreign	29.6	24.5	16.7
Deferred taxation:
– US	(28.4)	82.0	(70.4)
– Foreign	(2.3)	(262.3)	(28.9)
Total income tax expense (benefit)	$ 63.0	$ (170.6)	$ 74.5