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Segment Information | 12 Months Ended
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Dec. 31, 2017
Segment Reporting [Abstract] |
Segment Information | Segment Information The Company’s segment information is presented in accordance with a “management approach,” which designates the internal reporting used by the Chief Operating Decision-Maker for deciding how to allocate resources and for assessing performance. The Company has three reportable segments: Corporate, which is comprised primarily of private sector business customers with more than 250 employees in the US, Small Business, primarily servicing private sector business customers with up to 250 employees in the US, and Public, which is comprised of government agencies and education and healthcare institutions in the US. The Company has two other operating segments: CDW Canada and CDW UK, both of which do not meet the reportable segment quantitative thresholds and, accordingly, are included in an all other category (“Other”). Effective January 1, 2016, CDW Advanced Services is no longer an operating segment. Its results have been allocated to the Corporate, Small Business and Public segments to align the Company's financial reporting with the manner in which the Chief Operating Decision-Maker assesses performance and makes resource allocation decisions. Segment information reported in prior periods has been reclassified to conform to the current period presentation. The Company has centralized logistics and headquarters functions that provide services to the segments. The logistics function includes purchasing, distribution and fulfillment services to support the Corporate, Small Business and Public segments. As a result, costs and intercompany charges associated with the logistics function are fully allocated to both of these segments based on a percent of Net sales. The centralized headquarters function provides services in areas such as accounting, information technology, marketing, legal and coworker services. Headquarters’ function costs that are not allocated to the segments are included under the heading of “Headquarters” in the tables below. The Company allocates resources to and evaluates performance of its segments based on Net sales, Income from operations and Adjusted EBITDA, a non-GAAP measure as defined in the Company’s credit agreements. However, the Company has concluded that Income from operations is the more useful measure in terms of discussion of operating results, as it is a GAAP measure. Segment information for Total assets and capital expenditures is not presented, as such information is not used in measuring segment performance or allocating resources between segments. Selected Segment Financial Information Information regarding the Company’s segments for the years ended December 31, 2017, 2016 and 2015 is as follows:
(in millions) | Corporate (1) |  | Small Business (1) |  | Public |  | Other |  | Headquarters |  | Total
2017: |  |  |  |  |  |  |  |  |  |  |
Net sales | $ | 6,347.0 |  |  | $ | 1,246.5 |  |  | $ | 6,037.5 |  |  | $ | 1,560.5 |  |  | $ | — |  |  | $ | 15,191.5 |
Income (loss) from operations | 487.0 |  |  | 74.4 |  |  | 374.0 |  |  | 57.9 |  |  | (127.2 | ) |  | 866.1 |
Depreciation and amortization expense | (83.1 | ) |  | (20.7 | ) |  | (44.8 | ) |  | (30.9 | ) |  | (81.4 | ) |  | (260.9 | )
2016: |  |  |  |  |  |  |  |  |  |  |
Net sales | $ | 5,889.8 |  |  | $ | 1,140.1 |  |  | $ | 5,589.4 |  |  | $ | 1,362.6 |  |  | $ | — |  |  | $ | 13,981.9 |
Income (loss) from operations | 453.6 |  |  | 68.9 |  |  | 368.0 |  |  | 43.6 |  |  | (114.9 | ) |  | 819.2 |
Depreciation and amortization expense | (82.9 | ) |  | (20.6 | ) |  | (44.7 | ) |  | (32.1 | ) |  | (74.2 | ) |  | (254.5 | )
2015: |  |  |  |  |  |  |  |  |  |  |
Net sales | $ | 5,878.7 |  |  | $ | 1,089.6 |  |  | $ | 5,183.6 |  |  | $ | 836.8 |  |  | $ | — |  |  | $ | 12,988.7 |
Income (loss) from operations | 432.5 |  |  | 68.3 |  |  | 328.6 |  |  | 27.1 |  |  | (114.5 | ) |  | 742.0 |
Depreciation and amortization expense | (82.6 | ) |  | (20.6 | ) |  | (44.7 | ) |  | (16.2 | ) |  | (63.3 | ) |  | (227.4 | )
(1) Amounts have been recast to present Small Business as its own operating and reportable segment. Geographic Areas and Revenue Mix The Company did not have Net sales to individual countries outside of the US exceeding 10% of the Company’s total Net sales in 2017, 2016 or 2015. The Company did not have long-lived assets located in individual countries outside of the US exceeding 10% of the Company’s total long-lived assets as of December 31, 2017 or 2016. The following table presents Net sales by major category for the years ended December 31, 2017, 2016 and 2015. Categories are based upon internal classifications.
| Year Ended December 31, 2017 |  | Year Ended December 31, 2016 (1) |  | Year Ended December 31, 2015 (1)
| Dollars in Millions |  | Percentage of Total Net Sales |  | Dollars in Millions |  | Percentage of Total Net Sales |  | Dollars in Millions |  | Percentage of Total Net Sales
Notebooks/Mobile Devices | $ | 3,490.9 |  |  | 23.1 | % |  | $ | 2,921.6 |  |  | 20.9 | % |  | $ | 2,537.3 |  |  | 19.5 | %
Netcomm Products | 2,042.9 |  |  | 13.4 |  |  | 1,958.2 |  |  | 14.0 |  |  | 1,915.0 |  |  | 14.7 |
Desktops | 1,159.4 |  |  | 7.6 |  |  | 1,050.0 |  |  | 7.5 |  |  | 965.6 |  |  | 7.4 |
Video | 1,076.9 |  |  | 7.1 |  |  | 962.1 |  |  | 6.9 |  |  | 853.8 |  |  | 6.6 |
Enterprise and Data Storage (Including Drives) | 1,071.5 |  |  | 7.1 |  |  | 1,053.1 |  |  | 7.5 |  |  | 1,067.2 |  |  | 8.2 |
Other Hardware | 3,100.3 |  |  | 20.4 |  |  | 3,042.6 |  |  | 21.8 |  |  | 2,950.5 |  |  | 22.7 |
Total Hardware | 11,941.9 |  |  | 78.7 |  |  | 10,987.6 |  |  | 78.6 |  |  | 10,289.4 |  |  | 79.1 |
Software | 2,540.1 |  |  | 16.7 |  |  | 2,389.3 |  |  | 17.1 |  |  | 2,152.3 |  |  | 16.6 |
Services(2) | 611.3 |  |  | 4.0 |  |  | 575.1 |  |  | 4.1 |  |  | 467.7 |  |  | 3.6 |
Other (3) | 98.2 |  |  | 0.6 |  |  | 29.9 |  |  | 0.2 |  |  | 79.3 |  |  | 0.7 |
Total Net sales | $ | 15,191.5 |  |  | 100.0 | % |  | $ | 13,981.9 |  |  | 100.0 | % |  | $ | 12,988.7 |  |  | 100.0 | %
(1) | Amounts have been reclassified for changes in individual product classifications to conform to the presentation for the year ended December 31, 2017.
(2) | Certain software and services revenue are recorded on a net basis for accounting purposes, so the category percentage of net revenues is not representative of the category percentage of gross profits.
(3) | Includes items such as delivery charges to customers and certain commission revenue.

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -URI http://asc.fasb.org/topic&trid=2134510 + Details
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