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Basis of presentation - Accounting policies (Details) - USD ($)
$ in Millions
12 Months Ended
Feb. 01, 2019
Feb. 02, 2018
Feb. 03, 2017
Feb. 02, 2019
Feb. 03, 2018
Revenue and gain recognition          
Liability for outstanding gift cards $ 5.2 $ 4.2      
Breakage income related to gift card program 0.8 0.6 $ 0.5    
Advertising costs          
Advertising costs 70.5 68.8 82.7    
Expenses related to vendor funding for cooperative advertising offset $ 35.0 $ 33.8 $ 35.9    
3.25% Senior Notes due April 15, 2023          
Other comprehensive income          
Debt maturity term 10 years        
Accounting Standards Update 2016-02          
Accounting standards          
Increase in deferred income tax liabilities         $ 41.3
Decrease in retained earnings         $ 41.3
Accounting Standards Update 2016-02 | Forecast          
Accounting standards          
Right of use assets       $ 8,000.0  
Consolidated lease liabilities       $ 8,000.0