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Long-Term Debt - Term Loan (Details) £ in Millions, $ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 GBP (£) | Sep. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Mar. 31, 2018 GBP (£) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Carrying value |  |  |  |  |  | $ 3,255.0 | $ 3,255.9 |
Net loss on extinguishments of long-term debt |  |  | $ 0.0 | $ 57.4 |  |  |  |
Senior secured term loan facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Carrying value |  |  |  |  |  | 1,464.3 | $ 1,468.0 | $ 1,500.0
Deferred financing costs |  |  |  |  |  | $ 2.0 |  |
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 |  |  |  |  | 4.30% | 4.30% | 3.70% |
CDW UK term loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Carrying value |  |  |  |  | £ 56.0 | $ 78.5 | $ 75.7 |
Variable interest rate margin |  |  |  |  | 1.40% | 1.40% |  |
Deferred finance costs, net and unamortized premium |  |  |  |  | £ (1.0) | $ (1.0) |  |
Interest Rate |  |  |  |  | 1.98% | 1.98% | 1.92% |
CDW UK Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Carrying value | £ |  |  |  |  | £ 0.0 |  |  |
Additional borrowing capacity |  |  |  |  | £ 50.0 | $ 70.0 |  |
ABR | Senior secured term loan facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Variable interest rate margin |  |  |  |  | 1.00% | 1.00% |  |
LIBOR | Senior secured term loan facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Variable interest rate margin |  |  |  |  | 2.00% | 2.00% |  |
Scenario, Forecast | CDW UK term loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of debt | £ 5.0 | $ 7.0 |  |  |  |  |  |

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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/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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