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Long-Term Debt Senior Secured Notes (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||||
|---|---|---|---|---|---|
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Aug. 05, 2014
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Jul. 02, 2013
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| Debt Instrument [Line Items] | |||||
| Debt, long-term and short-term | $ 3,192.4us-gaap_DebtInstrumentCarryingAmount | ||||
| Gains (Losses) on Extinguishment of Debt | 90.7us-gaap_GainsLossesOnExtinguishmentOfDebt | 64.0us-gaap_GainsLossesOnExtinguishmentOfDebt | 17.2us-gaap_GainsLossesOnExtinguishmentOfDebt | ||
| Write off of Deferred Debt Issuance Cost | 12.6us-gaap_WriteOffOfDeferredDebtIssuanceCost | 20.1us-gaap_WriteOffOfDeferredDebtIssuanceCost | |||
| Senior secured notes due 2018 [Member] | |||||
| Debt Instrument [Line Items] | |||||
| Long-term debt, stated interest rate | 8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = cdw_SeniorSecuredNotesDue2018Member |
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| Debt, long-term and short-term | 0us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = cdw_SeniorSecuredNotesDue2018Member |
325.0us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = cdw_SeniorSecuredNotesDue2018Member |
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| Debt Instrument, Repurchased Face Amount | 325.0us-gaap_DebtInstrumentRepurchasedFaceAmount / us-gaap_LongtermDebtTypeAxis = cdw_SeniorSecuredNotesDue2018Member |
175.0us-gaap_DebtInstrumentRepurchasedFaceAmount / us-gaap_LongtermDebtTypeAxis = cdw_SeniorSecuredNotesDue2018Member |
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| Redemption Premium, percentage of par value | 106.061%cdw_RedemptionPremiumpercentageofparvalue / us-gaap_LongtermDebtTypeAxis = cdw_SeniorSecuredNotesDue2018Member |
108.00%cdw_RedemptionPremiumpercentageofparvalue / us-gaap_LongtermDebtTypeAxis = cdw_SeniorSecuredNotesDue2018Member |
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| Extinguishment of Debt, Accrued Interest Paid to Lenders | 0.7cdw_ExtinguishmentOfDebtAccruedInterestPaidToLenders / us-gaap_LongtermDebtTypeAxis = cdw_SeniorSecuredNotesDue2018Member |
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| Gains (Losses) on Extinguishment of Debt | (23.7)us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_LongtermDebtTypeAxis = cdw_SeniorSecuredNotesDue2018Member |
16.7us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_LongtermDebtTypeAxis = cdw_SeniorSecuredNotesDue2018Member |
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| Extinguishment of Debt, Fees Paid to Lenders | 13.0cdw_ExtinguishmentOfDebtFeesPaidToLenders / us-gaap_LongtermDebtTypeAxis = cdw_SeniorSecuredNotesDue2018Member |
14.0cdw_ExtinguishmentOfDebtFeesPaidToLenders / us-gaap_LongtermDebtTypeAxis = cdw_SeniorSecuredNotesDue2018Member |
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| Extinguishment of Debt, Make-whole Interest Payment | 6.7cdw_ExtinguishmentofDebtMakewholeInterestPayment / us-gaap_LongtermDebtTypeAxis = cdw_SeniorSecuredNotesDue2018Member |
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| Write off of Deferred Debt Issuance Cost | $ 4.0us-gaap_WriteOffOfDeferredDebtIssuanceCost / us-gaap_LongtermDebtTypeAxis = cdw_SeniorSecuredNotesDue2018Member |
$ 2.7us-gaap_WriteOffOfDeferredDebtIssuanceCost / us-gaap_LongtermDebtTypeAxis = cdw_SeniorSecuredNotesDue2018Member |
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| X | ||||||||||
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- Definition
Extinguishment of Debt, Accrued Interest Paid to Lenders No definition available.
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| X | ||||||||||
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- Definition
Extinguishment of Debt, Fees Paid to Lenders No definition available.
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| X | ||||||||||
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- Definition
Extinguishment of Debt, Make-whole Interest Payment No definition available.
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| X | ||||||||||
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- Definition
Redemption Premium, percentage of par value No definition available.
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| X | ||||||||||
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- Definition
Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Contractual interest rate for funds borrowed, under the debt agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Face (par) amount of the original debt instrument that was repurchased. No definition available.
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| X | ||||||||||
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- Definition
Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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