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Common shares, treasury shares, reserves and dividends - Dividends (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 30, 2021 | Oct. 31, 2020 | Aug. 01, 2020 | May 02, 2020 | Feb. 01, 2020 | Nov. 02, 2019 | Aug. 03, 2019 | May 04, 2019 | Feb. 02, 2019 | Nov. 03, 2018 | Aug. 04, 2018 | May 05, 2018 | Jan. 30, 2021 | Feb. 01, 2020 | Feb. 02, 2019
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend per share (usd per share) | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.37 | $ 0.37 | $ 0.37 | $ 0.37 | $ 0.37 | $ 0.37 | $ 0.37 | $ 0.37 | $ 0 | $ 1.48 | $ 1.48
Total dividends | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 | $ 19.4 | $ 19.4 | $ 19.3 | $ 19.3 | $ 19.2 | $ 19.2 | $ 19.2 | $ 21.8 | $ 0.0 | $ 77.4 | $ 79.4
Dividends payable |  |  |  |  | 19.4 |  |  |  |  |  |  |  |  | 19.4 |
Dividends, preferred stock, cash |  |  |  |  |  |  |  |  |  |  |  |  | 33.5 | 32.9 | 32.9
Series A Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends, preferred stock, paid-in-kind | 8.1 | $ 8.0 | $ 7.9 | $ 7.8 |  |  |  |  |  |  |  |  | 31.8 |  |
Dividends, preferred stock, cash |  |  |  |  | $ 7.8 | $ 7.8 | $ 7.8 | $ 7.8 | 7.8 | $ 7.8 | $ 7.8 | $ 7.8 |  | $ 31.2 | 31.2
Accrued Expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable | $ 8.1 |  |  |  |  |  |  |  | $ 7.8 |  |  |  | $ 8.1 |  | $ 7.8

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