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Shareholders' equity - Dividends (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended						9 Months Ended
	Nov. 02, 2019	Aug. 03, 2019	May 04, 2019	Nov. 03, 2018	Aug. 04, 2018	May 05, 2018	Nov. 02, 2019	Nov. 03, 2018
Dividends Payable [Line Items]
Dividends declared per common share (usd per share)	$ 0.37	$ 0.37	$ 0.37	$ 0.37	$ 0.37	$ 0.37	$ 1.11	$ 1.11
Dividends, common stock	$ 19.4	$ 19.3	$ 19.3	$ 19.2	$ 19.2	$ 21.8	$ 58.0	$ 60.2
Dividends declared per preferred share (usd per share)	$ 12.50	$ 12.50	$ 12.50	$ 12.50	$ 12.50	$ 12.50	$ 37.50	$ 37.50
Dividends, preferred stock	$ 7.8	$ 7.8	$ 7.8	$ 7.8	$ 7.8	$ 7.8	$ 23.4	$ 23.4
Accrued expenses and other current liabilities
Dividends Payable [Line Items]
Dividends, common stock	19.4			19.2
Dividends, preferred stock	$ 7.8			$ 7.8

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

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-Publisher FASB
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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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Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash.

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