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Segment Information (Tables) | 12 Months Ended
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Dec. 31, 2018
Segment Reporting [Abstract] |
Schedule of Segment Reporting Information, by Segment | Information about the Company's segments for the years ended December 31, 2018, 2017 and 2016 are as follows:
(in millions) |  | Corporate |  | Small Business |  | Public |  | Other |  | Headquarters |  | Total
2018: |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ | 6,842.5 |  |  | $ | 1,359.6 |  |  | $ | 6,154.7 |  |  | $ | 1,883.7 |  |  | $ | — |  |  | $ | 16,240.5 |
Operating income (loss) |  | 536.9 |  |  | 95.7 |  |  | 410.8 |  |  | 82.2 |  |  | (138.3 | ) |  | 987.3 |
Depreciation and amortization expense |  | (81.7 | ) |  | (20.8 | ) |  | (45.4 | ) |  | (31.8 | ) |  | (85.9 | ) |  | (265.6 | )
2017(1): |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ | 6,172.8 |  |  | $ | 1,220.5 |  |  | $ | 5,906.5 |  |  | $ | 1,533.1 |  |  | $ | — |  |  | $ | 14,832.9 |
Operating income (loss) |  | 487.9 |  |  | 74.3 |  |  | 374.4 |  |  | 57.1 |  |  | (127.2 | ) |  | 866.5 |
Depreciation and amortization expense |  | (83.1 | ) |  | (20.7 | ) |  | (44.8 | ) |  | (30.9 | ) |  | (81.4 | ) |  | (260.9 | )
2016(1): |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ | 5,734.9 |  |  | $ | 1,118.1 |  |  | $ | 5,477.4 |  |  | $ | 1,342.3 |  |  | $ | — |  |  | $ | 13,672.7 |
Operating income (loss) |  | 453.5 |  |  | 69.1 |  |  | 367.7 |  |  | 44.6 |  |  | (114.9 | ) |  | 820.0 |
Depreciation and amortization expense |  | (82.9 | ) |  | (20.6 | ) |  | (44.7 | ) |  | (32.1 | ) |  | (74.2 | ) |  | (254.5 | )
Disaggregation of Revenue |
| 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 |  |  |  |  |  |  |  |  |
Hardware | 5,455.6 |  |  | 1,135.8 |  |  | 4,998.9 |  |  | 1,492.1 |  |  | 13,082.4 |
Software | 982.3 |  |  | 174.5 |  |  | 976.4 |  |  | 213.8 |  |  | 2,347.0 |
Services | 337.3 |  |  | 28.2 |  |  | 162.8 |  |  | 169.0 |  |  | 697.3 |
Other(2) | 67.3 |  |  | 21.1 |  |  | 16.6 |  |  | 8.8 |  |  | 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) | Includes items such as delivery charges to customers.
| Year Ended December 31, 2017(1)
| Corporate |  | Small Business |  | Public |  | Other |  | Total
Geography(2) |  |  |  |  |  |  |  |  |
United States | $ | 6,167.4 |  |  | $ | 1,220.5 |  |  | $ | 5,906.5 |  |  | $ | 25.5 |  |  | $ | 13,319.9 |
Rest of World | 5.4 |  |  | — |  |  | — |  |  | 1,507.6 |  |  | 1,513.0 |
Total Net sales | 6,172.8 |  |  | 1,220.5 |  |  | 5,906.5 |  |  | 1,533.1 |  |  | 14,832.9 |
Major Product and Services |  |  |  |  |  |  |  |  |
Hardware | 4,871.6 |  |  | 1,012.5 |  |  | 4,846.5 |  |  | 1,229.8 |  |  | 11,960.4 |
Software | 918.5 |  |  | 163.1 |  |  | 908.3 |  |  | 167.0 |  |  | 2,156.9 |
Services | 316.2 |  |  | 24.5 |  |  | 133.5 |  |  | 128.5 |  |  | 602.7 |
Other(3) | 66.5 |  |  | 20.4 |  |  | 18.2 |  |  | 7.8 |  |  | 112.9 |
Total Net sales | 6,172.8 |  |  | 1,220.5 |  |  | 5,906.5 |  |  | 1,533.1 |  |  | 14,832.9 |
Sales by Channel |  |  |  |  |  |  |  |  |
Corporate | 6,172.8 |  |  | — |  |  | — |  |  | — |  |  | 6,172.8 |
Small Business | — |  |  | 1,220.5 |  |  | — |  |  | — |  |  | 1,220.5 |
Government | — |  |  |  |  | 2,109.8 |  |  | — |  |  | 2,109.8 |
Education | — |  |  | — |  |  | 2,184.5 |  |  | — |  |  | 2,184.5 |
Healthcare | — |  |  | — |  |  | 1,612.2 |  |  | — |  |  | 1,612.2 |
Other | — |  |  | — |  |  | — |  |  | 1,533.1 |  |  | 1,533.1 |
Total Net sales | 6,172.8 |  |  | 1,220.5 |  |  | 5,906.5 |  |  | 1,533.1 |  |  | 14,832.9 |
Timing of Revenue Recognition |  |  |  |  |  |  |  |  |
Transferred at a point in time where CDW is principal | 5,640.9 |  |  | 1,152.5 |  |  | 5,559.4 |  |  | 1,375.7 |  |  | 13,728.5 |
Transferred at a point in time where CDW is agent | 344.2 |  |  | 59.4 |  |  | 184.1 |  |  | 27.9 |  |  | 615.6 |
Transferred over time where CDW is principal | 187.7 |  |  | 8.6 |  |  | 163.0 |  |  | 129.5 |  |  | 488.8 |
Total Net sales | $ | 6,172.8 |  |  | $ | 1,220.5 |  |  | $ | 5,906.5 |  |  | $ | 1,533.1 |  |  | $ | 14,832.9 |
(1) | Amounts for 2017 have been adjusted to reflect the adoption of Topic 606.
(2) | 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.
(3) | Includes items such as delivery charges to customers.
| Year Ended December 31, 2016(1)
| Corporate |  | Small Business |  | Public |  | Other |  | Total
Geography(2) |  |  |  |  |  |  |  |  |
United States | $ | 5,594.6 |  |  | $ | 1,118.1 |  |  | $ | 5,477.4 |  |  | $ | 28.2 |  |  | $ | 12,218.3 |
Rest of World | 140.3 |  |  | — |  |  | — |  |  | 1,314.1 |  |  | 1,454.4 |
Total Net sales | 5,734.9 |  |  | 1,118.1 |  |  | 5,477.4 |  |  | 1,342.3 |  |  | 13,672.7 |
Major Product and Services |  |  |  |  |  |  |  |  |
Hardware | 4,495.6 |  |  | 908.3 |  |  | 4,481.2 |  |  | 1,030.9 |  |  | 10,916.0 |
Software | 876.3 |  |  | 165.0 |  |  | 855.4 |  |  | 175.6 |  |  | 2,072.3 |
Services | 291.5 |  |  | 24.1 |  |  | 119.6 |  |  | 129.0 |  |  | 564.2 |
Other(3) | 71.5 |  |  | 20.7 |  |  | 21.2 |  |  | 6.8 |  |  | 120.2 |
Total Net sales | 5,734.9 |  |  | 1,118.1 |  |  | 5,477.4 |  |  | 1,342.3 |  |  | 13,672.7 |
Sales by Channel |  |  |  |  |  |  |  |  |
Corporate | 5,734.9 |  |  | — |  |  | — |  |  | — |  |  | 5,734.9 |
Small Business | — |  |  | 1,118.1 |  |  | — |  |  | — |  |  | 1,118.1 |
Government | — |  |  | — |  |  | 1,813.6 |  |  | — |  |  | 1,813.6 |
Education | — |  |  | — |  |  | 1,994.4 |  |  | — |  |  | 1,994.4 |
Healthcare | — |  |  | — |  |  | 1,669.4 |  |  | — |  |  | 1,669.4 |
Other | — |  |  | — |  |  | — |  |  | 1,342.3 |  |  | 1,342.3 |
Total Net sales | 5,734.9 |  |  | 1,118.1 |  |  | 5,477.4 |  |  | 1,342.3 |  |  | 13,672.7 |
Timing of Revenue Recognition |  |  |  |  |  |  |  |  |
Transferred at a point in time where CDW is principal | 5,279.8 |  |  | 1,061.3 |  |  | 5,182.4 |  |  | 1,201.8 |  |  | 12,725.3 |
Transferred at a point in time where CDW is agent | 281.4 |  |  | 46.8 |  |  | 149.3 |  |  | 22.5 |  |  | 500.0 |
Transferred over time where CDW is principal | 173.7 |  |  | 10.0 |  |  | 145.7 |  |  | 118.0 |  |  | 447.4 |
Total Net sales | $ | 5,734.9 |  |  | $ | 1,118.1 |  |  | $ | 5,477.4 |  |  | $ | 1,342.3 |  |  | $ | 13,672.7 |
(1) | Amounts for 2016 have been adjusted to reflect the adoption of Topic 606.
(2) | 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.
(3) | Includes items such as delivery charges to customers.
The following table presents Net sales by major category for the years ended December 31, 2018, 2017 and 2016. Categories are based upon internal classifications.
| Year Ended December 31,
| 2018 |  | 2017(1)(2) |  | 2016(1)(2)
| 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 | $ | 4,053.6 |  |  | 25.0 | % |  | $ | 3,519.8 |  |  | 23.7 | % |  | $ | 2,942.9 |  |  | 21.5 | %
Netcomm Products | 2,119.8 |  |  | 13.1 |  |  | 2,040.3 |  |  | 13.8 |  |  | 1,957.0 |  |  | 14.3 |
Desktops | 1,318.2 |  |  | 8.1 |  |  | 1,207.0 |  |  | 8.1 |  |  | 1,087.7 |  |  | 8.0 |
Video | 1,185.6 |  |  | 7.3 |  |  | 1,078.4 |  |  | 7.3 |  |  | 963.0 |  |  | 7.0 |
Enterprise and Data Storage (Including Drives) | 1,099.2 |  |  | 6.8 |  |  | 1,087.3 |  |  | 7.3 |  |  | 1,073.9 |  |  | 7.9 |
Other Hardware | 3,306.0 |  |  | 20.3 |  |  | 3,027.6 |  |  | 20.4 |  |  | 2,891.5 |  |  | 21.1 |
Total Hardware | 13,082.4 |  |  | 80.6 |  |  | 11,960.4 |  |  | 80.6 |  |  | 10,916.0 |  |  | 79.8 |
Software(3) | 2,347.0 |  |  | 14.4 |  |  | 2,156.9 |  |  | 14.5 |  |  | 2,072.3 |  |  | 15.2 |
Services(3) | 697.3 |  |  | 4.3 |  |  | 602.7 |  |  | 4.1 |  |  | 564.2 |  |  | 4.1 |
Other(4) | 113.8 |  |  | 0.7 |  |  | 112.9 |  |  | 0.8 |  |  | 120.2 |  |  | 0.9 |
Total Net sales | $ | 16,240.5 |  |  | 100.0 | % |  | $ | 14,832.9 |  |  | 100.0 | % |  | $ | 13,672.7 |  |  | 100.0 | %
(1) | Amounts for 2017 and 2016 have been adjusted to reflect the adoption of Topic 606.
(2) | Amounts have been reclassified for changes in individual product classifications to conform to the presentation for the year ended December 31, 2018.
(3) | 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.
(4) Includes items such as delivery charges to customers.

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