XML 37 R25.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Financial Instruments (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2018
Financial Instruments [Abstract] |
Schedule of Interest Rate Derivatives | As of March 31, 2018 and December 31, 2017, the Company had the following interest rate cap agreements for which the fair values are classified within Other assets on the Consolidated Balance Sheets:
|  |  |  |  |  | March 31, 2018 |  | December 31, 2017
Notional Value (in millions) |  | Effective Date |  | Maturity Date |  | Fair Value (in millions) |  | Fair Value (in millions)
$ | 1,400.0 |  |  | January 17, 2017 |  | December 31, 2018 |  | $ | 8.8 |  |  | $ | 5.4 |
1,400.0 |  |  | December 31, 2018 |  | December 31, 2020 |  | 12.7 |  |  | — |
|  |  |  |  |  | $ | 21.5 |  |  | $ | 5.4 |

X
- Definition Financial Instruments [Abstract] + References No definition available. + Details
Name: | cdw_FinancialInstrumentsAbstract
Namespace Prefix: | cdw_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of interest rate derivatives, including, but not limited to, the fair value of the derivatives, statement of financial position location, and statement of financial performance location of these instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
Name: | us-gaap_ScheduleOfInterestRateDerivativesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration