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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

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