Commitments and Contingencies (Data Breach) (Details) $ in Millions	2 Months Ended	6 Months Ended	12 Months Ended		18 Months Ended
	Mar. 24, 2016 USD ($)	Feb. 01, 2015 USD ($)	Jan. 31, 2016 USD ($)	Feb. 01, 2015 USD ($)	Jan. 31, 2016 USD ($)	Feb. 29, 2016	Nov. 01, 2015
Insurance [Abstract]
Network Security Insurance Coverage			$ 100.0	$ 100.0
Network Security Insurance Deductible			10.0	7.5
Subsequent Event [Member]
Loss Contingency, Information about Litigation Matters [Abstract]
Number of Derivative Complaints						1
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	(34.0)		(12.0)
Data Breach, Expenses Incurred		$ (63.0)	(198.0)		$ (261.0)
Data Breach, Payments Made		51.0	176.0
Data Breach, Liability, Ending Balance		(12.0)	(34.0)	(12.0)	(34.0)
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]
Data Breach, Beginning Balance of Insurance Receivable	$ 70.0		20.0
Data Breach, Insurance Receivable Recorded		30.0	70.0		100.0
Data Breach, Payments Received		(10.0)	(20.0)		(30.0)
Data Breach, Ending Balance of Insurance Receivable		$ 20.0	$ 70.0	$ 20.0	$ 70.0
Loss Contingency, Information about Litigation Matters [Abstract]
Data Breach Number of Actions Filed			57		57
Data Breach Number Of Purported Shareholder Derivative Actions Filed							2
Data Breach, Expenses Incurred Net of Insurance Receivable Recorded			$ 128.0		$ 161.0