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Share-based compensation - Unrecognized Compensation Costs related to Awards (Details)
$ in Millions
12 Months Ended
Feb. 01, 2020
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized Compensation Cost $ 22.2
Omnibus Plan  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized Compensation Cost $ 21.8
Weighted average period 1 year 8 months 12 days
Saving Share Plans  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized Compensation Cost $ 0.4
Weighted average period 1 year 2 months 12 days