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Basis of presentation - Accounting policies (Details) - USD ($)
$ in Millions
12 Months Ended
Feb. 02, 2018
Feb. 03, 2017
Jan. 29, 2016
Feb. 03, 2018
Other comprehensive income        
Debt maturity term 10 years      
Revenue and gain recognition        
Liability for outstanding gift cards $ 4.2 $ 3.4    
Breakage income related to the gift card program 0.6 0.5 $ 0.6  
Advertising costs        
Advertising costs 68.8 82.7 89.3  
Expenses related to vendor funding for cooperative advertising offset $ 33.8 $ 35.9 $ 36.7  
Accounting Standards Update 2016-16 [Member]        
Accounting standards        
Increase in deferred income tax liabilities       $ 33.6
Accounting Standards Update 2016-16 [Member] | Forecast        
Accounting standards        
Decrease in retained earnings       $ 33.6