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Fair value measurements - Outstanding Debt (Details) - USD ($) $ in Millions | Oct. 28, 2017 | Jan. 28, 2017 | Oct. 29, 2016
--- | --- | --- | ---
Carrying Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Outstanding debt | $ 724.3 | $ 1,338.5 | $ 1,342.3
Fair Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Outstanding debt | 731.7 | 1,339.8 | 1,343.5
Senior Notes | Level 2 | Carrying Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Outstanding debt | 394.3 | 393.7 | 393.4
Senior Notes | Level 2 | Fair Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Outstanding debt | 398.8 | 391.2 | 390.5
Securitization Facility | Level 2 | Carrying Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Outstanding debt | 0.0 | 599.7 | 599.6
Securitization Facility | Level 2 | Fair Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Outstanding debt | 0.0 | 600.0 | 600.0
Term Loan | Level 2 | Carrying Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Outstanding debt | 330.0 | 345.1 | 349.3
Term Loan | Level 2 | Fair Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Outstanding debt | $ 332.9 | $ 348.6 | $ 353.0

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