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Basis of presentation (Details)
$ in Millions
12 Months Ended
Feb. 01, 2019
USD ($)
store
state
period
Feb. 02, 2018
USD ($)
period
Feb. 03, 2017
USD ($)
period
Basis of presentation and accounting policies      
Fiscal year, number of weeks | period 52 52 53
Number of stores through which entity sells general merchandise on a retail basis | store 15,370    
Number of states which entity covers | state 44    
Cash and cash equivalents      
Maximum original maturity period at time of purchase of liquid investments classified as cash equivalents 3 months    
Payments due from processors for electronic tender transactions classified as cash and cash equivalents $ 99.5 $ 90.4  
Merchandise inventories      
Excess of current cost over LIFO cost 103.7 78.5  
LIFO provision (benefit) $ 25.2 $ (2.2) $ (12.2)