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Shareholders' equity - Dividends (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
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May 04, 2019 | May 05, 2018
Dividends Payable [Line Items] |  |
Dividends declared per common share (usd per share) | $ 0.37 | $ 0.37
Dividends, common stock | $ 19.3 | $ 21.8
Dividends declared per preferred share (usd per share) | $ 12.50 | $ 12.50
Dividends on redeemable convertible preferred shares | $ 8.2 | $ 8.2
Series A Redeemable Convertible Preferred Stock |  |
Dividends Payable [Line Items] |  |
Dividends declared per preferred share (usd per share) | $ 12.5 | $ 12.5
Dividends, preferred stock | $ 7.8 | $ 7.8
Dividends on redeemable convertible preferred shares | 0.4 | 0.4
Accrued Expenses |  |
Dividends Payable [Line Items] |  |
Dividends, preferred stock | $ 7.8 |
Other liabilities |  |
Dividends Payable [Line Items] |  |
Dividends, preferred stock |  | $ 7.8

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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details
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- Definition Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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