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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. 29, 2022
Jan. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Beginning Balance (shares) 4.8  
Granted (shares) 1.0  
Vested (shares) (0.9)  
Lapsed or forfeited (shares) (0.6)  
Ending Balance (shares) 4.3 4.8
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Beginning Balance (usd per share) $ 15.24  
Granted (usd per share) 54.22  
Vested (usd per share) 10.90  
Lapsed or forfeited (usd per share) 37.06  
Ending Balance (usd per share) $ 22.28 $ 15.24
Weighted average remaining contractual life 1 year 1 month 6 days 1 year 9 months 18 days
Intrinsic value $ 369.3 $ 192.3