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Common shares, treasury shares, and dividends -Schedule of Dividends (Details) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended												12 Months Ended
	Oct. 08, 2024	May 06, 2024	Jan. 31, 2026	Nov. 01, 2025	Aug. 02, 2025	May 03, 2025	Feb. 01, 2025	Nov. 02, 2024	Aug. 03, 2024	May 04, 2024	Feb. 03, 2024	Oct. 28, 2023	Jul. 29, 2023	Apr. 29, 2023	Jan. 31, 2026	Feb. 01, 2025	Feb. 03, 2024
Class of Stock [Line Items]
Cash dividend per share (usd per share)			$ 0.32	$ 0.32	$ 0.32	$ 0.32	$ 0.29	$ 0.29	$ 0.29	$ 0.29	$ 0.23	$ 0.23	$ 0.23	$ 0.23	$ 1.28	$ 1.16	$ 0.92
Dividends, Common Stock, Cash			$ 13.1	$ 13.2	$ 13.3	$ 13.4	$ 12.5	$ 12.6	$ 12.9	$ 12.9	$ 10.2	$ 10.2	$ 10.3	$ 10.4	$ 53.0	$ 50.9	$ 41.1
Dividends, preferred stock, cash																96.8	34.5
Series A Redeemable Convertible Preferred Stock
Class of Stock [Line Items]
Dividends, preferred stock, cash							0.0	$ 1.3	$ 2.8	$ 6.2	$ 8.3	$ 8.2	$ 8.2	$ 8.2		10.3	$ 32.9
Dividends, Preferred Stock	$ 1.3	$ 2.1
Other Current Liabilities [Member] \| Common shares at par value
Class of Stock [Line Items]
Dividends payable, current			13.7				$ 12.5								13.7	$ 12.5
Other Current Liabilities [Member] \| Restricted Stock Units (RSUs)
Class of Stock [Line Items]
Dividends payable, current			$ 0.6												$ 0.6