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Shareholders' equity - Narrative (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended		30 Months Ended
	Nov. 01, 2025	Aug. 02, 2025	May 03, 2025	Nov. 02, 2024	Aug. 03, 2024	May 04, 2024	Nov. 01, 2025	Nov. 02, 2024	Nov. 01, 2025	Feb. 01, 2025	Mar. 30, 2024
Class of Stock [Line Items]
Amount repurchased	$ 28.5	$ 32.3	$ 117.4	$ 66.6	$ 39.8	$ 7.4
2017 Program
Class of Stock [Line Items]
Stock Repurchase Program, Increase to Authorized Amount											$ 200.0
Stock repurchase program, authorized amount										$ 2,100.0
Remaining authorized repurchase amount	$ 544.9						$ 544.9		$ 544.9	$ 723.0
Amount repurchased							$ 178.2	$ 113.8	$ 1,600.0

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