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Common shares, treasury shares, and dividends -Schedule of Class of Treasury Stock (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended			72 Months Ended
	Feb. 03, 2024	Jan. 28, 2023	Jan. 29, 2022	Feb. 03, 2024
Class of Stock [Line Items]
Amount repurchased	$ 139.3	$ 376.1	$ 311.8
2017 Program
Class of Stock [Line Items]
Shares repurchased (shares)	1.9	6.1	3.2
Amount repurchased	$ 139.3	$ 426.1	$ 261.8	$ 1,200.0
Average repurchase price per share (usd per share)	$ 73.06	$ 70.06	$ 81.16
Accelerated Share Repurchase Agreement
Class of Stock [Line Items]
Amount repurchased	$ 50.0

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