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			84 Months Ended
	Feb. 01, 2025	Feb. 03, 2024	Jan. 28, 2023	Feb. 01, 2025
Class of Stock [Line Items]
Amount repurchased	$ 138.0	$ 139.3	$ 376.1
2017 Program
Class of Stock [Line Items]
Shares repurchased (shares)	1.6	1.9	6.1
Amount repurchased	$ 138.0	$ 139.3	$ 426.1	$ 1,400.0
Average repurchase price per share (usd per share)	$ 85.04	$ 73.06	$ 70.06
Accelerated Share Repurchase Agreement
Class of Stock [Line Items]
Amount repurchased			$ 50.0