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Long-Term Debt - Term Loan (Details) £ in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 GBP (£) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Apr. 03, 2018 | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Carrying value |  |  |  |  |  | $ 3,238.2 |  | $ 3,255.9 |
Net loss on extinguishments of long-term debt |  | $ 0.0 | $ 0.0 | $ 0.0 | $ 57.4 |  |  |  |
Senior secured term loan facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Reduction in interest margins from debt amended |  |  |  |  |  |  | 0.25% |  |
Net leverage ratio | 2.33 |  |  |  |  | 2.33 | 3.75 |  |
Carrying value |  |  |  |  |  | $ 1,456.9 |  | $ 1,468.0 | $ 1,500.0
Deferred financing costs |  |  |  |  |  | $ 3.0 |  |  |
Quarterly principal installment |  |  |  | $ 4.0 |  |  |  |  |
Net loss on extinguishments of long-term debt |  |  |  |  | 14.0 |  |  |  |
Write off of deferred financing costs |  |  |  |  | 5.0 |  |  |  |
Write off of deferred debt discount |  |  |  |  | 9.0 |  |  |  |
Payments of debt issuance costs |  |  |  |  | $ 2.0 |  |  |  |
Interest Rate | 3.80% |  |  |  |  | 3.80% |  | 3.70% |
CDW UK term loan |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Variable interest rate margin | 1.40% |  |  |  |  | 1.40% |  |  |
Carrying value | £ 51 |  |  |  |  | $ 66.0 |  | $ 75.7 |
Deferred finance costs, net and unamortized premium | 1 |  |  |  |  | $ 1.0 |  |  |
Repayments of debt | £ 5 | $ 7.0 |  |  |  |  |  |  |
Interest Rate | 2.29% |  |  |  |  | 2.29% |  | 1.90% |
CDW UK Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Carrying value | £ 5 |  |  |  |  | $ 7.0 |  |  |
Total borrowing capacity | £ 50 |  |  |  |  | $ 65.0 |  |  |
LIBOR | Senior secured term loan facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Variable interest rate margin |  |  |  |  |  |  | 1.75% |  |
ABR | Senior secured term loan facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Variable interest rate margin |  |  |  |  |  |  | 0.75% |  |
Federal Funds Effective Swap Rate | Senior secured term loan facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as percent) |  |  |  | 0.50% |  |  |  |  |

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- Definition For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) and premiums that will be charged against earnings over the life of the debt instruments to which such costs and premiums pertain. + References No definition available. + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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