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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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