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Segment Information (Tables)

12 Months Ended

Dec. 31, 2020

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

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)

Disaggregation of Revenue

			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

Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor.

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Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

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