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Segment Information | 12 Months Ended
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Dec. 31, 2020
Segment Reporting [Abstract] |
Segment Information | Segment Information The Company's segment information reflects the way the Chief Operating Decision Maker uses internal reporting to evaluate business performance, allocate resources and manage operations. 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 UK and CDW Canada, both of which do not meet the reportable segment quantitative thresholds and, accordingly, are included in an all other category ("Other"). 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 all 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, Operating income and Non-GAAP Operating income. However, the Company has concluded that Operating income is the more useful measure in terms of discussion of operating results, as it is a US 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 about the Company's segments for the years ended December 31, 2020, 2019 and 2018 is as follows:
|  | Corporate |  | Small Business |  | Public |  | Other |  | Headquarters |  | Total
2020: |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ | 6,846.0 |  |  | $ | 1,397.1 |  |  | $ | 8,137.7 |  |  | $ | 2,086.7 |  |  | $ | — |  |  | $ | 18,467.5 |
Operating income (loss) |  | 489.5 |  |  | 99.0 |  |  | 678.2 |  |  | 65.9 |  |  | (153.4) |  |  | 1,179.2 |
Depreciation and amortization expense |  | (73.2) |  |  | (18.3) |  |  | (229.7) |  |  | (32.5) |  |  | (71.9) |  |  | (425.6) |
2019: |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ | 7,499.0 |  |  | $ | 1,510.3 |  |  | $ | 6,864.8 |  |  | $ | 2,158.3 |  |  | $ | — |  |  | $ | 18,032.4 |
Operating income (loss) |  | 585.1 |  |  | 107.5 |  |  | 475.0 |  |  | 101.6 |  |  | (135.6) |  |  | 1,133.6 |
Depreciation and amortization expense |  | (86.9) |  |  | (22.5) |  |  | (56.3) |  |  | (31.2) |  |  | (70.2) |  |  | (267.1) |
2018: |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ | 6,842.5 |  |  | $ | 1,359.6 |  |  | $ | 6,154.7 |  |  | $ | 1,883.7 |  |  | $ | — |  |  | $ | 16,240.5 |
Operating income (loss) |  | 530.4 |  |  | 94.4 |  |  | 405.0 |  |  | 82.2 |  |  | (124.7) |  |  | 987.3 |
Depreciation and amortization expense |  | (88.2) |  |  | (22.1) |  |  | (51.2) |  |  | (31.8) |  |  | (72.3) |  |  | (265.6) |
Geographic Areas and Revenue Mix
| Year Ended December 31, 2020 |  |
| Corporate |  | Small Business |  | Public |  | Other |  | Total |  |  |  |  |  |  |  |  |  |
Geography(1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States | $ | 6,823.6 |  |  | $ | 1,397.1 |  |  | $ | 8,137.7 |  |  | $ | 20.8 |  |  | $ | 16,379.2 |  |  |  |  |  |  |  |  |  |  |
Rest of World | 22.4 |  |  | — |  |  | — |  |  | 2,065.9 |  |  | 2,088.3 |  |  |  |  |  |  |  |  |  |  |
Total Net sales | 6,846.0 |  |  | 1,397.1 |  |  | 8,137.7 |  |  | 2,086.7 |  |  | 18,467.5 |  |  |  |  |  |  |  |  |  |  |
Major Product and Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hardware | 5,289.2 |  |  | 1,156.1 |  |  | 6,844.0 |  |  | 1,544.1 |  |  | 14,833.4 |  |  |  |  |  |  |  |  |  |  |
Software | 1,088.3 |  |  | 189.3 |  |  | 982.8 |  |  | 320.6 |  |  | 2,581.0 |  |  |  |  |  |  |  |  |  |  |
Services | 400.8 |  |  | 31.5 |  |  | 269.8 |  |  | 211.8 |  |  | 913.9 |  |  |  |  |  |  |  |  |  |  |
Other(2) | 67.7 |  |  | 20.2 |  |  | 41.1 |  |  | 10.2 |  |  | 139.2 |  |  |  |  |  |  |  |  |  |  |
Total Net sales | 6,846.0 |  |  | 1,397.1 |  |  | 8,137.7 |  |  | 2,086.7 |  |  | 18,467.5 |  |  |  |  |  |  |  |  |  |  |
Sales by Channel |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate | 6,846.0 |  |  | — |  |  | — |  |  | — |  |  | 6,846.0 |  |  |  |  |  |  |  |  |  |  |
Small Business | — |  |  | 1,397.1 |  |  | — |  |  | — |  |  | 1,397.1 |  |  |  |  |  |  |  |  |  |  |
Government | — |  |  | — |  |  | 2,978.5 |  |  | — |  |  | 2,978.5 |  |  |  |  |  |  |  |  |  |  |
Education | — |  |  | — |  |  | 3,458.1 |  |  | — |  |  | 3,458.1 |  |  |  |  |  |  |  |  |  |  |
Healthcare | — |  |  | — |  |  | 1,701.1 |  |  | — |  |  | 1,701.1 |  |  |  |  |  |  |  |  |  |  |
Other | — |  |  | — |  |  | — |  |  | 2,086.7 |  |  | 2,086.7 |  |  |  |  |  |  |  |  |  |  |
Total Net sales | 6,846.0 |  |  | 1,397.1 |  |  | 8,137.7 |  |  | 2,086.7 |  |  | 18,467.5 |  |  |  |  |  |  |  |  |  |  |
Timing of Revenue Recognition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transferred at a point in time where CDW is principal | 6,140.7 |  |  | 1,301.3 |  |  | 7,477.4 |  |  | 1,835.5 |  |  | 16,754.9 |  |  |  |  |  |  |  |  |  |  |
Transferred at a point in time where CDW is agent | 457.4 |  |  | 84.5 |  |  | 292.5 |  |  | 61.6 |  |  | 896.0 |  |  |  |  |  |  |  |  |  |  |
Transferred over time where CDW is principal | 247.9 |  |  | 11.3 |  |  | 367.8 |  |  | 189.6 |  |  | 816.6 |  |  |  |  |  |  |  |  |  |  |
Total Net sales | $ | 6,846.0 |  |  | $ | 1,397.1 |  |  | $ | 8,137.7 |  |  | $ | 2,086.7 |  |  | $ | 18,467.5 |  |  |  |  |  |  |  |  |  |  |
(1)Net sales by geography is generally based on the ship-to address with the exception of certain services that may be performed at, or on behalf of, multiple locations. Such service arrangements are categorized based on the bill-to address. (2)Includes items such as delivery charges to customers.
| Year Ended December 31, 2019 |  |
| Corporate |  | Small Business |  | Public |  | Other |  | Total |  |  |  |  |  |  |  |  |  |
Geography(1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States | $ | 7,485.7 |  |  | $ | 1,510.3 |  |  | $ | 6,864.8 |  |  | $ | 32.5 |  |  | $ | 15,893.3 |  |  |  |  |  |  |  |  |  |  |
Rest of World | 13.3 |  |  | — |  |  | — |  |  | 2,125.8 |  |  | 2,139.1 |  |  |  |  |  |  |  |  |  |  |
Total Net sales | 7,499.0 |  |  | 1,510.3 |  |  | 6,864.8 |  |  | 2,158.3 |  |  | 18,032.4 |  |  |  |  |  |  |  |  |  |  |
Major Product and Services(2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hardware | 5,963.7 |  |  | 1,264.7 |  |  | 5,624.9 |  |  | 1,628.9 |  |  | 14,482.2 |  |  |  |  |  |  |  |  |  |  |
Software | 1,069.2 |  |  | 196.0 |  |  | 1,019.6 |  |  | 300.2 |  |  | 2,585.0 |  |  |  |  |  |  |  |  |  |  |
Services | 395.8 |  |  | 28.5 |  |  | 199.0 |  |  | 217.6 |  |  | 840.9 |  |  |  |  |  |  |  |  |  |  |
Other(3) | 70.3 |  |  | 21.1 |  |  | 21.3 |  |  | 11.6 |  |  | 124.3 |  |  |  |  |  |  |  |  |  |  |
Total Net sales | 7,499.0 |  |  | 1,510.3 |  |  | 6,864.8 |  |  | 2,158.3 |  |  | 18,032.4 |  |  |  |  |  |  |  |  |  |  |
Sales by Channel |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate | 7,499.0 |  |  | — |  |  | — |  |  | — |  |  | 7,499.0 |  |  |  |  |  |  |  |  |  |  |
Small Business | — |  |  | 1,510.3 |  |  | — |  |  | — |  |  | 1,510.3 |  |  |  |  |  |  |  |  |  |  |
Government | — |  |  | — |  |  | 2,519.3 |  |  | — |  |  | 2,519.3 |  |  |  |  |  |  |  |  |  |  |
Education | — |  |  | — |  |  | 2,411.6 |  |  | — |  |  | 2,411.6 |  |  |  |  |  |  |  |  |  |  |
Healthcare | — |  |  | — |  |  | 1,933.9 |  |  | — |  |  | 1,933.9 |  |  |  |  |  |  |  |  |  |  |
Other | — |  |  | — |  |  | — |  |  | 2,158.3 |  |  | 2,158.3 |  |  |  |  |  |  |  |  |  |  |
Total Net sales | 7,499.0 |  |  | 1,510.3 |  |  | 6,864.8 |  |  | 2,158.3 |  |  | 18,032.4 |  |  |  |  |  |  |  |  |  |  |
Timing of Revenue Recognition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transferred at a point in time where CDW is principal | 6,818.7 |  |  | 1,423.1 |  |  | 6,410.2 |  |  | 1,900.6 |  |  | 16,552.6 |  |  |  |  |  |  |  |  |  |  |
Transferred at a point in time where CDW is agent | 446.1 |  |  | 80.0 |  |  | 248.5 |  |  | 59.6 |  |  | 834.2 |  |  |  |  |  |  |  |  |  |  |
Transferred over time where CDW is principal | 234.2 |  |  | 7.2 |  |  | 206.1 |  |  | 198.1 |  |  | 645.6 |  |  |  |  |  |  |  |  |  |  |
Total Net sales | $ | 7,499.0 |  |  | $ | 1,510.3 |  |  | $ | 6,864.8 |  |  | $ | 2,158.3 |  |  | $ | 18,032.4 |  |  |  |  |  |  |  |  |  |  |
(1)Net sales by geography is generally based on the ship-to address with the exception of certain services that may be performed at, or on behalf of, multiple locations. Such service arrangements are categorized based on the bill-to address. (2)Amounts have been reclassified for changes in individual product classifications to conform to the presentation for the year ended December 31, 2020. (3)Includes items such as delivery charges to customers.
| Year Ended December 31, 2018 |  |
| Corporate |  | Small Business |  | Public |  | Other |  | Total |  |  |  |  |  |  |  |  |  |
Geography(1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States | $ | 6,834.4 |  |  | $ | 1,359.6 |  |  | $ | 6,154.7 |  |  | $ | 30.9 |  |  | $ | 14,379.6 |  |  |  |  |  |  |  |  |  |  |
Rest of World | 8.1 |  |  | — |  |  | — |  |  | 1,852.8 |  |  | 1,860.9 |  |  |  |  |  |  |  |  |  |  |
Total Net sales | 6,842.5 |  |  | 1,359.6 |  |  | 6,154.7 |  |  | 1,883.7 |  |  | 16,240.5 |  |  |  |  |  |  |  |  |  |  |
Major Product and Services(2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hardware | 5,464.9 |  |  | 1,135.2 |  |  | 5,039.3 |  |  | 1,492.3 |  |  | 13,131.7 |  |  |  |  |  |  |  |  |  |  |
Software | 973.3 |  |  | 175.2 |  |  | 937.0 |  |  | 213.6 |  |  | 2,299.1 |  |  |  |  |  |  |  |  |  |  |
Services | 336.9 |  |  | 28.1 |  |  | 161.8 |  |  | 169.1 |  |  | 695.9 |  |  |  |  |  |  |  |  |  |  |
Other(3) | 67.4 |  |  | 21.1 |  |  | 16.6 |  |  | 8.7 |  |  | 113.8 |  |  |  |  |  |  |  |  |  |  |
Total Net sales | 6,842.5 |  |  | 1,359.6 |  |  | 6,154.7 |  |  | 1,883.7 |  |  | 16,240.5 |  |  |  |  |  |  |  |  |  |  |
Sales by Channel |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate | 6,842.5 |  |  | — |  |  | — |  |  | — |  |  | 6,842.5 |  |  |  |  |  |  |  |  |  |  |
Small Business | — |  |  | 1,359.6 |  |  | — |  |  | — |  |  | 1,359.6 |  |  |  |  |  |  |  |  |  |  |
Government | — |  |  | — |  |  | 2,097.3 |  |  | — |  |  | 2,097.3 |  |  |  |  |  |  |  |  |  |  |
Education | — |  |  | — |  |  | 2,327.4 |  |  | — |  |  | 2,327.4 |  |  |  |  |  |  |  |  |  |  |
Healthcare | — |  |  | — |  |  | 1,730.0 |  |  | — |  |  | 1,730.0 |  |  |  |  |  |  |  |  |  |  |
Other | — |  |  | — |  |  | — |  |  | 1,883.7 |  |  | 1,883.7 |  |  |  |  |  |  |  |  |  |  |
Total Net sales | 6,842.5 |  |  | 1,359.6 |  |  | 6,154.7 |  |  | 1,883.7 |  |  | 16,240.5 |  |  |  |  |  |  |  |  |  |  |
Timing of Revenue Recognition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transferred at a point in time where CDW is principal | 6,256.5 |  |  | 1,281.3 |  |  | 5,758.6 |  |  | 1,687.6 |  |  | 14,984.0 |  |  |  |  |  |  |  |  |  |  |
Transferred at a point in time where CDW is agent | 389.1 |  |  | 69.4 |  |  | 211.5 |  |  | 49.8 |  |  | 719.8 |  |  |  |  |  |  |  |  |  |  |
Transferred over time where CDW is principal | 196.9 |  |  | 8.9 |  |  | 184.6 |  |  | 146.3 |  |  | 536.7 |  |  |  |  |  |  |  |  |  |  |
Total Net sales | $ | 6,842.5 |  |  | $ | 1,359.6 |  |  | $ | 6,154.7 |  |  | $ | 1,883.7 |  |  | $ | 16,240.5 |  |  |  |  |  |  |  |  |  |  |
(1)Net sales by geography is generally based on the ship-to address with the exception of certain services that may be performed at, or on behalf of, multiple locations. Such service arrangements are categorized based on the bill-to address. (2)Amounts have been reclassified for changes in individual product classifications to conform to the presentation for the year ended December 31, 2020. (3)Includes items such as delivery charges to customers. The following table presents Net sales by major category for the years ended December 31, 2020, 2019 and 2018. Categories are based upon internal classifications.
| Year Ended December 31, |
| 2020 |  | 2019(1) |  | 2018(1) |  |  |  |
| Net Sales |  | Percentage of Total Net Sales |  | Net Sales |  | Percentage of Total Net Sales |  | Net Sales |  | Percentage of Total Net Sales |  |  |  |
Notebooks/Mobile Devices | $ | 5,486.2 |  |  | 29.7 | % |  | $ | 4,344.9 |  |  | 24.1 | % |  | $ | 3,843.3 |  |  | 23.7 | % |  |  |  |
Netcomm Products | 1,955.0 |  |  | 10.6 |  |  | 2,189.1 |  |  | 12.1 |  |  | 2,116.6 |  |  | 13.0 |  |  |  |  |
Desktops | 1,132.4 |  |  | 6.1 |  |  | 1,547.3 |  |  | 8.6 |  |  | 1,254.9 |  |  | 7.7 |  |  |  |  |
Video | 1,190.8 |  |  | 6.4 |  |  | 1,272.9 |  |  | 7.1 |  |  | 1,184.1 |  |  | 7.3 |  |  |  |  |
Enterprise and Data Storage (Including Drives) | 947.4 |  |  | 5.1 |  |  | 1,147.6 |  |  | 6.4 |  |  | 1,102.4 |  |  | 6.8 |  |  |  |  |
Other Hardware | 4,121.6 |  |  | 22.3 |  |  | 3,980.4 |  |  | 22.1 |  |  | 3,630.4 |  |  | 22.4 |  |  |  |  |
Total Hardware | 14,833.4 |  |  | 80.2 |  |  | 14,482.2 |  |  | 80.4 |  |  | 13,131.7 |  |  | 80.9 |  |  |  |  |
Software(2) | 2,581.0 |  |  | 14.0 |  |  | 2,585.0 |  |  | 14.3 |  |  | 2,299.1 |  |  | 14.2 |  |  |  |  |
Services(2) | 913.9 |  |  | 4.9 |  |  | 840.9 |  |  | 4.7 |  |  | 695.9 |  |  | 4.3 |  |  |  |  |
Other(3) | 139.2 |  |  | 0.9 |  |  | 124.3 |  |  | 0.6 |  |  | 113.8 |  |  | 0.6 |  |  |  |  |
Total Net sales | $ | 18,467.5 |  |  | 100.0 | % |  | $ | 18,032.4 |  |  | 100.0 | % |  | $ | 16,240.5 |  |  | 100.0 | % |  |  |  |
(1)Amounts have been reclassified for changes in individual product classifications to conform to the presentation for the year ended December 31, 2020. (2)Certain software and services revenues are recorded on a net basis for accounting purposes. As a result, 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.

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8924-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8981-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8844-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8657-108599 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8721-108599 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -URI http://asc.fasb.org/topic&trid=2134510 + Details
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