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Common Shares, Treasury Shares, Reserves and Dividends - Dividends (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 03, 2018 | Oct. 28, 2017 | Jul. 29, 2017 | Apr. 29, 2017 | Jan. 28, 2017 | Oct. 29, 2016 | Jul. 30, 2016 | Apr. 30, 2016 | Jan. 30, 2016 | Oct. 31, 2015 | Aug. 01, 2015 | May 02, 2015 | Oct. 29, 2016 | Feb. 03, 2018 | Jan. 28, 2017 | Jan. 30, 2016
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per common share (usd per share) | $ 0.31 | $ 0.31 | $ 0.31 | $ 0.31 | $ 0.26 | $ 0.26 | $ 0.26 | $ 0.26 | $ 0.22 | $ 0.22 | $ 0.22 | $ 0.22 |  | $ 1.24 | $ 1.04 | $ 0.88
Cash dividend per share (usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.24 | $ 1.04 | $ 0.88
Total dividends | $ 18.8 | $ 18.7 | $ 18.7 | $ 21.3 | $ 17.7 | $ 18.1 | $ 19.7 | $ 20.4 | $ 17.5 | $ 17.5 | $ 17.6 | $ 17.6 |  | $ 77.5 | $ 75.9 | $ 70.2
Dividends on preferred shares | 18.8 |  |  |  | 17.7 |  |  |  |  |  |  |  |  | 18.8 | 17.7 |
Series A Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends, preferred stock, cash | $ 7.8 | $ 7.8 | $ 7.8 | $ 7.8 | $ 11.3 | $ 0.0 | $ 0.0 | $ 0.0 |  |  |  |  | $ 11.3 | 31.2 |  |
Accrued Expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends, preferred stock, cash |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7.8 | $ 11.3 |

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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