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Acquisition - Fair Value of Consideration Transferred (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Aug. 01, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition [Line Items] |  |  |  |
Gain on remeasurement of equity investment |  | $ 0.0 | $ 0.0 | $ 98.1
CDW UK |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash | $ 291.6 |  |  |
Fair value of CDW common stock | 33.2 |  |  |
Fair value of previously held equity investment on the date of acquisition | 174.9 |  |  |
Total consideration | $ 499.7 |  |  |
Shares issued during acquisition | 1,634,809 |  |  |
Restriction period for common shares issued | 3 years |  |  |
Options issued by one of the sellers to certain coworkers over shares of the seller's common stock received as part of consideration from acquisition | 608,706 |  |  |
Fair value of options issued by one of the sellers to certain coworkers over shares of the seller's common stock received as part of consideration from acquisition | $ 22.0 |  |  |
Weighted-average service period of options issued by one of the sellers to certain coworkers over shares of the seller's common stock received as part of consideration from acquisition | 3 years 2 months 12 days |  |  |
Non-controlling interest held | 35.00% |  |  |
Gain on remeasurement of equity investment | $ 98.0 |  |  |

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- Definition Options issued by one of the sellers to certain coworkers over shares of the seller's common stock received as part of consideration from acquisition + References No definition available. + Details
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- Definition Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition Fair value at acquisition-date of the equity interest in the acquiree held by the acquirer, immediately before the acquisition date for businesses combined in stages. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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