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Commitments and Contingencies (Data Breach) (Details) - USD ($)
$ in Millions
 2 Months Ended 6 Months Ended 12 Months Ended 18 Months Ended 30 Months Ended
Mar. 23, 2017
Feb. 01, 2015
Jan. 29, 2017
Jan. 31, 2016
Feb. 01, 2015
Jan. 31, 2016
Jan. 29, 2017
Insurance [Abstract]              
Network Security Insurance Coverage     $ 100.0 $ 100.0 $ 100.0    
Network Security Insurance Deductible     10.0 10.0 7.5    
Subsequent Event [Member]              
Insurance [Abstract]              
Network Security Insurance Coverage $ 100.0            
Network Security Insurance Deductible 10.0            
Data Breach [Member]              
Loss Contingency Accrual [Roll Forward]              
Data Breach, Liability, Beginning Balance (32.0)   (34.0) (12.0)      
Data Breach, Expenses Incurred   $ (63.0) (37.0) (198.0)     $ (298.0)
Data Breach, Payments Made   51.0 39.0 176.0      
Data Breach, Liability, Ending Balance   (12.0) (32.0) (34.0) (12.0) $ (34.0) (32.0)
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]              
Data Breach, Beginning Balance of Insurance Receivable $ 20.0   70.0 20.0      
Data Breach, Insurance Receivable Recorded   30.0 0.0 70.0     100.0
Data Breach, Payments Received   (10.0) (50.0) (20.0)   (80.0)  
Data Breach, Ending Balance of Insurance Receivable   $ 20.0 $ 20.0 $ 70.0 $ 20.0 $ 70.0 20.0
Loss Contingency, Information about Litigation Matters [Abstract]              
Data Breach, Expenses Incurred Net of Insurance Receivable Recorded             $ 198.0