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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
Feb. 01, 2020
Nov. 02, 2019
Aug. 03, 2019
May 04, 2019
Feb. 02, 2019
Nov. 03, 2018
Aug. 04, 2018
May 05, 2018
Feb. 03, 2018
Oct. 28, 2017
Jul. 29, 2017
Apr. 29, 2017
Feb. 01, 2020
Feb. 02, 2019
Feb. 03, 2018
Class of Stock [Line Items]                              
Dividends declared per common share (usd per share) $ 0.37 $ 0.37 $ 0.37 $ 0.37 $ 0.37 $ 0.37 $ 0.37 $ 0.37 $ 0.31 $ 0.31 $ 0.31 $ 0.31      
Cash dividend per share (usd per share)                         $ 1.48 $ 1.48 $ 1.24
Total dividends $ 19.4 $ 19.4 $ 19.3 $ 19.3 $ 19.2 $ 19.2 $ 19.2 $ 21.8 $ 18.8 $ 18.7 $ 18.7 $ 21.3 $ 77.4 $ 79.4 $ 77.5
Dividends on preferred shares 19.4       19.2               19.4 19.2  
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 $ 7.8 $ 7.8 $ 7.8 $ 7.8 31.2 31.2 $ 31.2
Accrued Expenses                              
Class of Stock [Line Items]                              
Dividends, preferred stock, cash                         $ 7.8 $ 7.8