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Stockholders' Equity (Restricted Stock Activity, Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Feb. 03, 2018
Jan. 28, 2017
Jan. 30, 2016
Restricted stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unamortized compensation expense $ 114.0 $ 101.6  
Weighted average remaining period of unrecognized compensation expense 1 year 9 months    
Intrinsic value per share, end of period (in dollars per share) $ 79.08    
Intrinsic value, end of period $ 433.6    
Treasury stock shares acquired (in shares) 0.7 0.7 1.3
Treasury stock, number of shares held (in shares) 12.5 11.8  
Restricted stock | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock vesting period 3 years    
Restricted stock | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock vesting period 5 years    
2017 Equity Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for new restricted stock awards (in shares) 11.9    
2017 Equity Incentive Plan | Restricted stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for new restricted stock awards (in shares) 11.9    
2008 Equity Incentive Plan | Restricted stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for new restricted stock awards (in shares)   12.1 12.7