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Shareholders' equity - Dividends (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				6 Months Ended
	Jul. 31, 2021	May 01, 2021	Aug. 01, 2020	May 02, 2020	Jul. 31, 2021	Aug. 01, 2020
Dividends Payable [Line Items]
Common stock, dividends (usd per share)	$ 0.18	$ 0	$ 0	$ 0	$ 0.18	$ 0
Dividends, common stock	$ 9.5	$ 0.0	$ 0.0	$ 0.0	$ 9.5	$ 0.0
Dividends declared per preferred share (usd per share)	$ 13.14	$ 13.14	$ 12.66	$ 12.50	$ 26.28	$ 25.16
Dividends, preferred stock, paid-in-kind	$ 8.2	$ 8.2	$ 7.9	$ 7.8	$ 16.4	$ 15.7
Common Stock | Accrued expenses and other current liabilities
Dividends Payable [Line Items]
Dividends payable	9.5				9.5
Series A Redeemable Convertible Preferred Stock | Accrued expenses and other current liabilities
Dividends Payable [Line Items]
Dividends payable	$ 8.2		$ 7.9		$ 8.2	$ 7.9

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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Amount of paid and unpaid preferred stock dividends declared with the form of settlement in payment-in-kind (PIK).

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