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Share-based compensation - Summary of Activity of Awards Granted under Omnibus Plan (Details) - Omnibus Plan - Restricted Stock and Restricted Stock Units - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Feb. 01, 2020
Feb. 02, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Beginning Balance (shares) 1.6  
Granted (shares) 1.6  
Vested (shares) (0.2)  
Lapsed (shares) (0.2)  
Ending Balance (shares) 2.8 1.6
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Beginning Balance (usd per share) $ 54.08  
Granted (usd per share) 18.14  
Vested (usd per share) 58.24  
Lapsed (usd per share) 80.47  
Ending Balance (usd per share) $ 31.04 $ 54.08
Weigted average remaining contractual life 1 year 6 months 1 year 6 months
Intrinsic value $ 66.9 $ 39.9