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Long-Term Debt - Debt Guarantors, Covenants and Restrictions (Details) £ in Millions, $ in Millions | Dec. 31, 2017 USD ($) | Dec. 31, 2017 GBP (£)
--- | --- | ---
Senior secured term loan facility |  |
Debt Instrument [Line Items] |  |
Amount of restricted payment capacity under the loan | $ 1,153 |
Net leverage ratio | 2.62 | 2.62
Senior secured term loan facility | Maximum |  |
Debt Instrument [Line Items] |  |
Net leverage ratio | 3.25 | 3.25
CDW UK term loan |  |
Debt Instrument [Line Items] |  |
Amount of restricted payment capacity under the loan | $ 98 | £ 73

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- Definition Amount of restricted net assets of consolidated and unconsolidated subsidiaries as of the end of the most recently completed fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e)(3)(ii)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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