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Fair value measurements - Outstanding Debt (Details) (USD $)
In Millions, unless otherwise specified
May 02, 2015
Jan. 31, 2015
May 03, 2014
Carrying Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Outstanding debt $ 1,384.4us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 $ 1,389.7us-gaap_DebtInstrumentFairValue
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= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 $ 0us-gaap_DebtInstrumentFairValue
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Fair Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Outstanding debt 1,401.5us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 1,406.5us-gaap_DebtInstrumentFairValue
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Senior Notes | Level 2 | Carrying Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Outstanding debt 398.5us-gaap_DebtInstrumentFairValue
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Senior Notes | Level 2 | Fair Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Outstanding debt 415.6us-gaap_DebtInstrumentFairValue
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Securitization Facility | Level 2 | Carrying Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Outstanding debt 600.0us-gaap_DebtInstrumentFairValue
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Securitization Facility | Level 2 | Fair Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Outstanding debt 600.0us-gaap_DebtInstrumentFairValue
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Term Loan | Level 2 | Carrying Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Outstanding debt 385.0us-gaap_DebtInstrumentFairValue
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Term Loan | Level 2 | Fair Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Outstanding debt 385.0us-gaap_DebtInstrumentFairValue
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Capital Lease Obligations | Level 2 | Carrying Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Outstanding debt 0.9us-gaap_DebtInstrumentFairValue
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= us-gaap_CapitalLeaseObligationsMember
Capital Lease Obligations | Level 2 | Fair Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Outstanding debt $ 0.9us-gaap_DebtInstrumentFairValue
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