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New accounting pronouncements - Effects of the Adoption of ASC 842 (Details) - USD ($)
$ in Millions
Nov. 02, 2019
Feb. 03, 2019
Feb. 02, 2019
Nov. 03, 2018
Current assets:        
Other current assets $ 207.2 $ 235.2 $ 244.0 $ 218.2
Non-current assets:        
Operating lease right-of-use assets 1,684.0 1,927.2 0.0  
Current liabilities:        
Accrued expenses and other current liabilities 434.6 469.9 502.8 431.3
Operating lease liabilities 324.9 376.5 0.0  
Non-current liabilities:        
Operating lease liabilities 1,448.9 1,676.9 0.0  
Other liabilities $ 120.4 122.0 $ 224.1 $ 233.2
Accounting Standards Update 2016-02        
Current assets:        
Other current assets   (8.8)    
Non-current assets:        
Operating lease right-of-use assets   1,927.2    
Current liabilities:        
Accrued expenses and other current liabilities   (32.9)    
Operating lease liabilities   376.5    
Non-current liabilities:        
Operating lease liabilities   1,676.9    
Other liabilities   $ (102.1)