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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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- Definition

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, stock and payment-in-kind (PIK).

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Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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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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