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Common shares, treasury shares, and dividends - Dividends (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 29, 2022 | Oct. 30, 2021 | Jul. 31, 2021 | May 01, 2021 | Jan. 30, 2021 | Oct. 31, 2020 | Aug. 01, 2020 | May 02, 2020 | Feb. 01, 2020 | Nov. 02, 2019 | Aug. 03, 2019 | May 04, 2019 | Jan. 29, 2022 | Jan. 30, 2021 | Feb. 01, 2020
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend per share (usd per share) | $ 0.18 | $ 0.18 | $ 0.18 | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.37 | $ 0.37 | $ 0.37 | $ 0.37 | $ 0.54 | $ 0.00 | $ 1.48
Total dividends | $ 9.0 | $ 9.5 | $ 9.5 | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 | $ 19.4 | $ 19.4 | $ 19.3 | $ 19.3 | $ 28.0 | $ 0.0 | $ 77.4
Dividends, preferred stock, cash |  |  |  |  |  |  |  |  |  |  |  |  | 34.5 | 33.5 | 32.9
Series A Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends, preferred stock, cash | 8.2 | $ 8.3 | $ 8.2 | $ 8.2 |  |  |  |  | $ 7.8 | $ 7.8 | $ 7.8 | $ 7.8 | 32.9 |  | $ 31.2
Dividends, preferred stock, paid-in-kind |  |  |  |  | 8.1 | $ 8.0 | $ 7.9 | $ 7.8 |  |  |  |  |  | 31.8 |
Accrued Expenses And Other Current Liabilities | Common shares at par value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable, current | 9.0 |  |  |  |  |  |  |  |  |  |  |  | 9.0 |  |
Accrued Expenses And Other Current Liabilities | Series A Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable, current | $ 8.2 |  |  |  | $ 8.1 |  |  |  |  |  |  |  | $ 8.2 | $ 8.1 |

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