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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						9 Months Ended		69 Months Ended
	Oct. 28, 2023	Jul. 29, 2023	Apr. 29, 2023	Oct. 29, 2022	Jul. 30, 2022	Apr. 30, 2022	Oct. 28, 2023	Oct. 29, 2022	Oct. 28, 2023
Class of Stock [Line Items]
Amount repurchased	$ 35.1	$ 43.3	$ 39.1	$ 20.2	$ 22.8	$ 268.2
2017 Program
Class of Stock [Line Items]
Shares repurchased (in shares)							1.7	5.1
Amount repurchased							$ 117.5	$ 361.2	$ 1,200.0
Average repurchase price per share (usd per share)							$ 70.76	$ 70.98
Accelerated Share Repurchase Agreement
Class of Stock [Line Items]
Amount repurchased								$ 50.0

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