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Shareholders' equity - Schedule of Class of Treasury Stock (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended				6 Months Ended		78 Months Ended
	Aug. 03, 2024	May 04, 2024	Jul. 29, 2023	Apr. 29, 2023	Aug. 03, 2024	Jul. 29, 2023	Aug. 03, 2024
Class of Stock [Line Items]
Amount repurchased	$ 39.8	$ 7.4	$ 43.3	$ 39.1
2017 Program
Class of Stock [Line Items]
Shares repurchased (in shares)					0.5	1.2
Amount repurchased					$ 47.2	$ 82.4	$ 1,300.0
Average repurchase price per share (usd per share)					$ 91.88	$ 69.88

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