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Share-based compensation - Summary of Activity of Awards Granted under Omnibus Plan (Details) - Omnibus Plan - Restricted Stock, Restricted Stock Units and Common Shares - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Jan. 30, 2021
Feb. 01, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Beginning Balance (shares) 2.8  
Granted (shares) 3.3  
Vested (shares) (0.4)  
Lapsed or forfeited (shares) (0.9)  
Ending Balance (shares) 4.8 2.8
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Beginning Balance (usd per share) $ 31.04  
Granted (usd per share) 9.62  
Vested (usd per share) 30.25  
Lapsed or forfeited (usd per share) 34.20  
Ending Balance (usd per share) $ 15.24 $ 31.04
Weighted average remaining contractual life 1 year 9 months 18 days 1 year 6 months
Intrinsic value $ 192.3 $ 66.9