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Common Shares, Treasury Shares, Reserves and Dividends - Dividends (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
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Feb. 02, 2019 | Nov. 03, 2018 | Aug. 04, 2018 | May 05, 2018 | 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 | Feb. 02, 2019 | Feb. 03, 2018 | Jan. 28, 2017
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per common share (usd per share) | $ 0.37 |  | $ 0.37 | $ 0.37 | $ 0.31 | $ 0.37 | $ 0.31 | $ 0.31 |  | $ 0.31 |  |  | $ 0.26 | $ 0.26 | $ 0.26 | $ 0.26 | $ 1.48 | $ 1.24 | $ 1.04
Cash dividend per share (usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.48 | $ 1.24 | $ 1.04
Total dividends | $ 19.2 |  | $ 19.2 | $ 21.8 | $ 18.8 | $ 19.2 | $ 18.7 | $ 21.3 |  | $ 18.7 |  |  | $ 17.7 | $ 18.1 | $ 19.7 | $ 20.4 | $ 79.4 | $ 77.5 | $ 75.9
Dividends on preferred shares | 19.2 |  |  |  | 18.8 |  |  |  |  |  |  |  |  |  |  |  | 19.2 | 18.8 |
Series A Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends, preferred stock, cash | $ 7.8 | $ 7.8 | $ 7.8 | $ 7.8 | $ 7.8 | $ 7.8 | $ 7.8 | $ 7.8 | $ 11.3 | $ 0.0 | $ 0.0 | $ 0.0 |  |  |  |  | 31.2 | 31.2 | $ 11.3
Accrued Expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends, preferred stock, cash |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7.8 | $ 7.8 |

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