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Share-Based Compensation (Details 3) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Feb. 03, 2018
Jan. 28, 2017
Jan. 30, 2016
Stock awards or units      
Number of Shares/Units      
Nonvested at the beginning of the period (in shares) 1,686,204    
Granted (in shares) 1,969,619    
Vested (in shares) (1,052,796)    
Forfeited (in shares) (138,461)    
Nonvested at the end of the period (in shares) 2,464,566 1,686,204  
Weighted Average Grant Date Fair Value      
Nonvested at the beginning of the period (in dollars per share) $ 18.80    
Granted (in dollars per share) 11.41 $ 18.01 $ 18.79
Vested (in dollars per share) 17.52    
Forfeited (in dollars per share) 14.94    
Nonvested at the end of the period (in dollars per share) $ 13.66 $ 18.80  
Additional disclosures, awards other than options      
Total fair value at grant date of previously nonvested stock awards/units that were vested during the period $ 18.4 $ 14.7 $ 14.0
Total intrinsic value of nonvested stock awards/units that vested during the period 12.6 $ 9.4 $ 11.0
Total intrinsic value of nonvested stock awards/units outstanding 36.0    
Income tax benefit on recognized compensation cost 5.6    
Unrecognized compensation cost related to nonvested stock awards/units $ 26.9    
Weighted average period for recognition of unrecognized compensation cost (in years/months/days) 1 year 7 months 1 day    
Excess tax shortfall included in cash flows from operating activities $ 1.3    
Performance-based units      
Number of Shares/Units      
Nonvested at the beginning of the period (in shares) 787,849    
Granted (in shares) 818,416    
Vested (in shares) (290,645)    
Forfeited (in shares) (14,699)    
Nonvested at the end of the period (in shares) 1,300,921 787,849  
Weighted Average Grant Date Fair Value      
Nonvested at the beginning of the period (in dollars per share) $ 19.17    
Granted (in dollars per share) 11.17    
Vested (in dollars per share) 19.85    
Forfeited (in dollars per share) 16.60    
Nonvested at the end of the period (in dollars per share) $ 14.01 $ 19.17  
Market-based awards/units      
Number of Shares/Units      
Nonvested at the beginning of the period (in shares) 323,825    
Granted (in shares) 309,118    
Vested (in shares) (244,466)    
Forfeited (in shares) 0    
Nonvested at the end of the period (in shares) 388,477 323,825  
Weighted Average Grant Date Fair Value      
Nonvested at the beginning of the period (in dollars per share) $ 16.63    
Granted (in dollars per share) 12.03    
Vested (in dollars per share) 17.72    
Forfeited (in dollars per share) 0.00    
Nonvested at the end of the period (in dollars per share) $ 12.28 $ 16.63