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Shareholders' equity - Dividends (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Aug. 01, 2020 | May 02, 2020 | Aug. 03, 2019 | May 04, 2019 | Aug. 01, 2020 | Aug. 03, 2019
Dividends Payable [Line Items] |  |  |  |  |  |
Dividends declared per common share (usd per share) | $ 0.00 | $ 0.00 | $ 0.37 | $ 0.37 | $ 0.00 | $ 0.74
Dividends, common stock | $ 0.0 | $ 0.0 | $ 19.3 | $ 19.3 | $ 0.0 | $ 38.6
Dividends declared per preferred share (usd per share) | $ 12.66 | $ 12.50 | $ 12.50 | $ 12.50 | $ 25.16 | $ 25.00
Dividends, preferred stock, paid-in-kind | $ 7.9 | $ 7.8 | $ 7.8 | $ 7.8 | $ 15.7 | $ 15.6
Common Stock | Accrued expenses and other current liabilities |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |
Dividends payable |  |  | 19.3 |  |  | 19.3
Series A Redeemable Convertible Preferred Stock | Accrued expenses and other current liabilities |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |
Dividends payable | $ 7.9 |  | $ 7.8 |  | $ 7.9 | $ 7.8

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